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<title>Anatomy, Bony Pelvis and Lower Limb: Calf Flexor Hallucis Longus Muscle - StatPearls - NCBI Bookshelf</title>
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<meta name="robots" content="INDEX,FOLLOW,NOARCHIVE" /><meta name="citation_inbook_title" content="StatPearls [Internet]" /><meta name="citation_title" content="Anatomy, Bony Pelvis and Lower Limb: Calf Flexor Hallucis Longus Muscle" /><meta name="citation_publisher" content="StatPearls Publishing" /><meta name="citation_date" content="2023/08/14" /><meta name="citation_author" content="Christopher J. Murdock" /><meta name="citation_author" content="Akul Munjal" /><meta name="citation_author" content="Kofi Agyeman" /><meta name="citation_pmid" content="30969598" /><meta name="citation_fulltext_html_url" content="https://www.ncbi.nlm.nih.gov/books/NBK539776/" /><link rel="schema.DC" href="http://purl.org/DC/elements/1.0/" /><meta name="DC.Title" content="Anatomy, Bony Pelvis and Lower Limb: Calf Flexor Hallucis Longus Muscle" /><meta name="DC.Type" content="Text" /><meta name="DC.Publisher" content="StatPearls Publishing" /><meta name="DC.Contributor" content="Christopher J. Murdock" /><meta name="DC.Contributor" content="Akul Munjal" /><meta name="DC.Contributor" content="Kofi Agyeman" /><meta name="DC.Date" content="2023/08/14" /><meta name="DC.Identifier" content="https://www.ncbi.nlm.nih.gov/books/NBK539776/" /><meta name="description" content="The flexor hallucis longus (FHL) muscle is one of the four muscles that compose the deep posterior compartment of the lower limb. The other three deep muscles are the flexor digitorum longus (FDL), tibialis posterior, and popliteus muscles. The flexor hallucis longus originates at the posterior surface of the fibula and inserting at the plantar aspect at the base of the distal phalanx of the great toe. The primary function of the flexor hallucis longus is flexion of the great toe, also serving to plantarflex and invert the foot. The antagonistic muscle is the extensor hallucis longus (EHL).[1]" /><meta name="og:title" content="Anatomy, Bony Pelvis and Lower Limb: Calf Flexor Hallucis Longus Muscle" /><meta name="og:type" content="book" /><meta name="og:description" content="The flexor hallucis longus (FHL) muscle is one of the four muscles that compose the deep posterior compartment of the lower limb. The other three deep muscles are the flexor digitorum longus (FDL), tibialis posterior, and popliteus muscles. The flexor hallucis longus originates at the posterior surface of the fibula and inserting at the plantar aspect at the base of the distal phalanx of the great toe. The primary function of the flexor hallucis longus is flexion of the great toe, also serving to plantarflex and invert the foot. The antagonistic muscle is the extensor hallucis longus (EHL).[1]" /><meta name="og:url" content="https://www.ncbi.nlm.nih.gov/books/NBK539776/" /><meta name="og:site_name" content="NCBI Bookshelf" /><meta name="og:image" content="https://www.ncbi.nlm.nih.gov/corehtml/pmc/pmcgifs/bookshelf/thumbs/th-statpearls-lrg.png" /><meta name="twitter:card" content="summary" /><meta name="twitter:site" content="@ncbibooks" /><meta name="bk-non-canon-loc" content="/books/n/statpearls/article-35887/" /><link rel="canonical" href="https://www.ncbi.nlm.nih.gov/books/NBK539776/" /><link rel="stylesheet" href="/corehtml/pmc/css/figpopup.css" type="text/css" media="screen" /><link rel="stylesheet" href="/corehtml/pmc/css/bookshelf/2.26/css/books.min.css" type="text/css" /><link rel="stylesheet" href="/corehtml/pmc/css/bookshelf/2.26/css/books_print.min.css" type="text/css" /><style type="text/css">p a.figpopup{display:inline !important} .bk_tt {font-family: monospace} .first-line-outdent .bk_ref {display: inline} </style><script type="text/javascript" src="/corehtml/pmc/js/jquery.hoverIntent.min.js"> </script><script type="text/javascript" src="/corehtml/pmc/js/common.min.js?_=3.18"> </script><script type="text/javascript">window.name="mainwindow";</script><script type="text/javascript" src="/corehtml/pmc/js/bookshelf/2.26/book-toc.min.js"> </script><script type="text/javascript" src="/corehtml/pmc/js/bookshelf/2.26/books.min.js"> </script>
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<div class="pre-content"><div><div class="bk_prnt"><p class="small">NCBI Bookshelf. A service of the National Library of Medicine, National Institutes of Health.</p><p>StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2025 Jan-. </p></div></div></div>
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<div class="main-content lit-style" itemscope="itemscope" itemtype="http://schema.org/CreativeWork"><div class="meta-content fm-sec"><h1 id="_NBK539776_"><span class="title" itemprop="name">Anatomy, Bony Pelvis and Lower Limb: Calf Flexor Hallucis Longus Muscle</span></h1><p class="contrib-group"><h4>Authors</h4><span itemprop="author">Christopher J. Murdock</span><sup>1</sup>; <span itemprop="author">Akul Munjal</span><sup>2</sup>; <span itemprop="author">Kofi Agyeman</span><sup>3</sup>.</p><h4>Affiliations</h4><div class="affiliation"><sup>1</sup> University of Miami Miller School of Med</div><div class="affiliation"><sup>2</sup> Medical College of Georgia</div><div class="affiliation"><sup>3</sup> University of Miami</div><p class="small">Last Update: <span itemprop="dateModified">August 14, 2023</span>.</p></div><div class="body-content whole_rhythm" itemprop="text"><div id="article-35887.s1"><h2 id="_article-35887_s1_">Introduction</h2><p>The flexor hallucis longus (FHL) muscle is one of the four muscles that compose the deep posterior compartment of the lower limb. The other three deep muscles are the flexor digitorum longus (FDL), tibialis posterior, and popliteus muscles. The flexor hallucis longus originates at the posterior surface of the fibula and inserting at the plantar aspect at the base of the distal phalanx of the great toe. The primary function of the flexor hallucis longus is flexion of the great toe, also serving to plantarflex and invert the foot. The antagonistic muscle is the extensor hallucis longus (EHL).<a class="bk_pop" href="#article-35887.r1">[1]</a></p></div><div id="article-35887.s2"><h2 id="_article-35887_s2_">Structure and Function</h2><p>The flexor hallucis longus is located towards the fibular aspect of the lower limb. The fibers of the flexor hallucis longus run obliquely inferiorly and posteriorly, passing through the tarsal tunnel on the medial aspect of the foot. The distal end of the flexor hallucis longus muscle is composed primarily of the tendon. This tendon runs inferiorly to the sustentaculum tali of the calcaneus, where it is stabilized by the annular ligament, traversing through the sole of the foot in-between the two heads of the flexor hallucis brevis muscle, continuing to the base of the great toe’s distal phalanx. The tendon passes through the grooves of the talus and the calcaneus, where it is connected to the flexor digitorum longus by a fibrous slip.<a class="bk_pop" href="#article-35887.r1">[1]</a><a class="bk_pop" href="#article-35887.r2">[2]</a></p><p>Much like the other deep posterior compartment muscles of the leg, the flexor hallucis longus muscle assists with plantar flexion and inversion of the foot. The unique function of the flexor hallucis longus is the ability to flex the great toe through plantar flexion of the talocrural joint and the metatarsophalangeal and interphalangeal joints of the great toe while also aiding in supinating the ankle.<a class="bk_pop" href="#article-35887.r2">[2]</a></p></div><div id="article-35887.s3"><h2 id="_article-35887_s3_">Blood Supply and Lymphatics</h2><p>The arterial supply to the flexor hallucis longus muscle is the muscular branch of the peroneal portion of the posterior tibial artery.<a class="bk_pop" href="#article-35887.r3">[3]</a> The venous system that drains this muscle is the peroneal vein, which is a branch of the popliteal vein. The lymphatic drainage of the flexor hallucis longus is the popliteal lymph nodes; the popliteal lymph nodes drain into the deep and superficial inguinal nodes.<a class="bk_pop" href="#article-35887.r1">[1]</a></p></div><div id="article-35887.s4"><h2 id="_article-35887_s4_">Nerves</h2><p>The tibial nerve, composed of spinal roots L4, L5, S1, S2, and S3, innervates the flexor hallucis longus; it receives most of its nerve supply from the S1 and S2 but also receives innervation from L5 as well via the muscular branch of the tibial nerve.<a class="bk_pop" href="#article-35887.r1">[1]</a></p></div><div id="article-35887.s5"><h2 id="_article-35887_s5_">Physiologic Variants</h2><p>A slip runs from the flexor digitorum longus to the flexor hallucis longus in most individuals, but an additional slip can also be viewed as an anatomical variant. This extremely rare extra muscle slip is known as the peroneocalcaneus internus. It originates inferiorly or laterally from the flexor hallucis longus muscle at the back of the fibula and passes over the sustentaculum tali alongside the flexor hallucis tendon, inserting into the calcaneus.<a class="bk_pop" href="#article-35887.r4">[4]</a><a class="bk_pop" href="#article-35887.r5">[5]</a></p><p>In patients with an anatomically variable flexor hallucis longus, research has found that the mean distance to the neurovascular tibial bundle increased, as the normal anatomy was 0.9 mm apart, while the anatomically varying individuals were 1.3 mm apart. This increased distance helps to improve safety in hindfoot endoscopic procedures.<a class="bk_pop" href="#article-35887.r4">[4]</a> The anatomical variance between the flexor digitorum longus and flexor hallucis longus muscles in the plantar foot is vital for facilitating tendon harvesting, thereby reducing morbidity, and can help explain the possible postoperative functional loss. The slip between the two might also contribute to why the flexion of the lesser toes remains after transferring the flexor digitorum longus muscle.<a class="bk_pop" href="#article-35887.r5">[5]</a></p></div><div id="article-35887.s6"><h2 id="_article-35887_s6_">Surgical Considerations</h2><p>In terms of surgical significance, the flexor hallucis longus has a role in Achilles (calcaneal) tendon rupture. A torn Achilles tendon usually presents as a patient reporting a "popping" feeling during strenuous exercise. Achilles tendon ruptures are especially common in patients with intermittent physical activity and are the most common tendon rupture in the lower extremity.<a class="bk_pop" href="#article-35887.r6">[6]</a> Symptoms are weakness and difficulty walking, and pain in the heel. In some chronic cases, physical exam findings include increased resting ankle dorsiflexion while prone and bent at the knee and calf atrophy. There usually is a palpable gap on the heel, and the patient will demonstrate a decreased range of motion in ankle plantar flexion and increased passive dorsiflexion. A Thompson test is used to help make a diagnosis and presents with a lack of plantar flexion when the examiner squeezes the calf.<a class="bk_pop" href="#article-35887.r7">[7]</a></p><p>With the flexor hallucis longus tendon having proximity to the Achilles tendon, the flexor hallucis longus is the most commonly used tendon for tendon transfer when the Achilles tendon is irreparable. The Achilles tendon usually is irreparable with a chronic retracted tear. The combination of its line of pull and proximity makes it the ideal candidate for Achilles tendon replacement. The surgical procedure for the flexor hallucis longus tendon replacing the Achilles tendon is called transfer for Achilles reconstruction.<a class="bk_pop" href="#article-35887.r8">[8]</a><a class="bk_pop" href="#article-35887.r9">[9]</a></p></div><div id="article-35887.s7"><h2 id="_article-35887_s7_">Clinical Significance</h2><p>A common issue seen with flexor hallucis longus dysfunction is stenosing tenosynovitis, which commonly occurs in ballet dancers who undergo extreme plantarflexion while performing various ballet movements. First-line treatment is rest and physical therapy, but a surgical approach is used if the injury is debilitating enough, followed by a well-crafted rehabilitation program. Anti-inflammatory medications can also be prescribed to alleviate symptoms.<a class="bk_pop" href="#article-35887.r10">[10]</a> Diagnosis of stenosing tenosynovitis has proven challenging as many symptoms overlap with flexor hallucis tendinitis, plantar fasciitis, and tarsal tunnel syndrome.<a class="bk_pop" href="#article-35887.r11">[11]</a> </p><p>Hallux saltans is another condition that arises from flexor hallucis longus muscle overuse. A nodule develops along the tendon that can cause a “popping effect” during contraction due to friction with surrounding tissues. If the nodule continues to grow, this can cause stenosis of the flexor hallucis longus tendon leading to the stifling of the range of motion in the big toe, leading to relative immobility.<a class="bk_pop" href="#article-35887.r12">[12]</a> When contracted, the appearance of the great toe takes on that of a rigidly flexed interphalangeal joint, a clinical finding known as a checkrein deformity.<a class="bk_pop" href="#article-35887.r13">[13]</a></p><p>Many clinical issues with the flexor hallucis longus muscle and tendon get overlooked because of the muscle being small in size. Diagnosis is via MRI to evaluate the pathology and condition of the flexor hallucis longus tendon. Diagnostic ultrasound is used to assess muscle movement and identify potential impingement sites.<a class="bk_pop" href="#article-35887.r11">[11]</a><a class="bk_pop" href="#article-35887.r12">[12]</a> </p><p>The flexor hallucis longus tendon also has utility for tendon transfer in chronic calcaneal (Achilles) tendon rupture. Single-incision flexor hallucis longus transfers for calcaneal tendon ruptures are considered a simple method with miniscule morbidity and complications.<a class="bk_pop" href="#article-35887.r8">[8]</a><a class="bk_pop" href="#article-35887.r9">[9]</a></p></div><div id="article-35887.s8"><h2 id="_article-35887_s8_">Review Questions</h2><ul><li class="half_rhythm"><div>
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</div></li></ul></div><div class="floats-group" id="article-35887.s9"></div><div class="floats-group" id="article-35887.s10"></div><div class="floats-group" id="article-35887.s11"></div><div id="article-35887.s12"><h2 id="_article-35887_s12_">References</h2><dl class="temp-labeled-list"><dt>1.</dt><dd><div class="bk_ref" id="article-35887.r1">Edama M, Kubo M, Onishi H, Takabayashi T, Yokoyama E, Inai T, Watanabe H, Nashimoto S, Kageyama I. Anatomical study of toe flexion by flexor hallucis longus. <span><span class="ref-journal">Ann Anat. </span>2016 Mar;<span class="ref-vol">204</span>:80-5.</span> [<a href="https://pubmed.ncbi.nlm.nih.gov/26704354" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 26704354</span></a>]</div></dd><dt>2.</dt><dd><div class="bk_ref" id="article-35887.r2">Mostafa E, Graefe SB, Varacallo M. <span class="ref-journal">StatPearls [Internet].</span> StatPearls Publishing; Treasure Island (FL): May 23, 2023. Anatomy, Bony Pelvis and Lower Limb: Leg Posterior Compartment. [<a href="/pmc/articles/PMC537340/" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pmc">PMC free article<span class="bk_prnt">: PMC537340</span></a>] [<a href="https://pubmed.ncbi.nlm.nih.gov/30726025" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 30726025</span></a>]</div></dd><dt>3.</dt><dd><div class="bk_ref" id="article-35887.r3">Sassu P, Acland RD, Salgado CJ, Mardini S, Ozyurekoglu T. Anatomy and vascularization of the flexor hallucis longus muscle and its implication in free fibula flap transfer: an anatomical study. <span><span class="ref-journal">Ann Plast Surg. </span>2010 Feb;<span class="ref-vol">64</span>(2):233-7.</span> [<a href="https://pubmed.ncbi.nlm.nih.gov/20098112" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 20098112</span></a>]</div></dd><dt>4.</dt><dd><div class="bk_ref" id="article-35887.r4">Vega J, Redó D, Savín G, Malagelada F, Dalmau-Pastor M. Anatomical variations of flexor hallucis longus tendon increase safety in hindfoot endoscopy. <span><span class="ref-journal">Knee Surg Sports Traumatol Arthrosc. </span>2017 Jun;<span class="ref-vol">25</span>(6):1929-1935.</span> [<a href="https://pubmed.ncbi.nlm.nih.gov/28220191" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 28220191</span></a>]</div></dd><dt>5.</dt><dd><div class="bk_ref" id="article-35887.r5">Plaass C, Abuharbid G, Waizy H, Ochs M, Stukenborg-Colsman C, Schmiedl A. Anatomical variations of the flexor hallucis longus and flexor digitorum longus in the chiasma plantare. <span><span class="ref-journal">Foot Ankle Int. </span>2013 Nov;<span class="ref-vol">34</span>(11):1580-7.</span> [<a href="https://pubmed.ncbi.nlm.nih.gov/23788233" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 23788233</span></a>]</div></dd><dt>6.</dt><dd><div class="bk_ref" id="article-35887.r6">Lemme NJ, Li NY, DeFroda SF, Kleiner J, Owens BD. Epidemiology of Achilles Tendon Ruptures in the United States: Athletic and Nonathletic Injuries From 2012 to 2016. <span><span class="ref-journal">Orthop J Sports Med. </span>2018 Nov;<span class="ref-vol">6</span>(11):2325967118808238.</span> [<a href="/pmc/articles/PMC6259075/" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pmc">PMC free article<span class="bk_prnt">: PMC6259075</span></a>] [<a href="https://pubmed.ncbi.nlm.nih.gov/30505872" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 30505872</span></a>]</div></dd><dt>7.</dt><dd><div class="bk_ref" id="article-35887.r7">Thermann H. [Achilles tendon rupture-Part 1: etiology and diagnostics]. <span><span class="ref-journal">Chirurg. </span>2019 Oct;<span class="ref-vol">90</span>(10):863-872.</span> [<a href="https://pubmed.ncbi.nlm.nih.gov/31531684" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 31531684</span></a>]</div></dd><dt>8.</dt><dd><div class="bk_ref" id="article-35887.r8">Abubeih H, Khaled M, Saleh WR, Said GZ. Flexor hallucis longus transfer clinical outcome through a single incision for chronic Achilles tendon rupture. <span><span class="ref-journal">Int Orthop. </span>2018 Nov;<span class="ref-vol">42</span>(11):2699-2704.</span> [<a href="https://pubmed.ncbi.nlm.nih.gov/29754186" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 29754186</span></a>]</div></dd><dt>9.</dt><dd><div class="bk_ref" id="article-35887.r9">Lee J, Williams C, Lowrey C, Gould G, Markert R, Laughlin R. Flexor Hallucis Longus Tendon Transfer Fixation. <span><span class="ref-journal">Foot Ankle Spec. </span>2017 Feb;<span class="ref-vol">10</span>(1):31-36.</span> [<a href="https://pubmed.ncbi.nlm.nih.gov/27604514" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 27604514</span></a>]</div></dd><dt>10.</dt><dd><div class="bk_ref" id="article-35887.r10">Vosseller JT, Dennis ER, Bronner S. Ankle Injuries in Dancers. <span><span class="ref-journal">J Am Acad Orthop Surg. </span>2019 Aug 15;<span class="ref-vol">27</span>(16):582-589.</span> [<a href="https://pubmed.ncbi.nlm.nih.gov/30789380" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 30789380</span></a>]</div></dd><dt>11.</dt><dd><div class="bk_ref" id="article-35887.r11">Anderson MR, Bell DE, Ketz JP. Flexor Hallucis Longus Muscle and Tendon Transfer for the Treatment of Achilles Tendon Wounds. <span><span class="ref-journal">Foot Ankle Int. </span>2018 Feb;<span class="ref-vol">39</span>(2):205-209.</span> [<a href="https://pubmed.ncbi.nlm.nih.gov/29171303" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 29171303</span></a>]</div></dd><dt>12.</dt><dd><div class="bk_ref" id="article-35887.r12">Martinez-Salazar EL, Vicentini JRT, Johnson AH, Torriani M. Hallux saltans due to stenosing tenosynovitis of flexor hallucis longus: dynamic sonography and arthroscopic findings. <span><span class="ref-journal">Skeletal Radiol. </span>2018 May;<span class="ref-vol">47</span>(5):747-750.</span> [<a href="https://pubmed.ncbi.nlm.nih.gov/29285554" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 29285554</span></a>]</div></dd><dt>13.</dt><dd><div class="bk_ref" id="article-35887.r13">Rodriguez-Collell JR, Mifsut-Miedes D. Checkrein Deformity of the Hallux and Second Toe after Soft-Tissue Injury. <span><span class="ref-journal">Case Rep Orthop. </span>2021;<span class="ref-vol">2021</span>:8459586.</span> [<a href="/pmc/articles/PMC7857917/" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pmc">PMC free article<span class="bk_prnt">: PMC7857917</span></a>] [<a href="https://pubmed.ncbi.nlm.nih.gov/33575050" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 33575050</span></a>]</div></dd></dl></div><div><dl class="temp-labeled-list small"><dt></dt><dd><div><p class="no_top_margin">
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<b>Disclosure: </b>Christopher Murdock declares no relevant financial relationships with ineligible companies.</p></div></dd><dt></dt><dd><div><p class="no_top_margin">
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<b>Disclosure: </b>Akul Munjal declares no relevant financial relationships with ineligible companies.</p></div></dd><dt></dt><dd><div><p class="no_top_margin">
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<b>Disclosure: </b>Kofi Agyeman declares no relevant financial relationships with ineligible companies.</p></div></dd></dl></div><div class="bk_prnt_sctn"><h2>Figures</h2><div class="whole_rhythm bk_prnt_obj bk_first_prnt_obj"><div id="article-35887.image.f1" class="figure bk_fig"><div class="graphic"><img src="/books/NBK539776/bin/Gray259.jpg" alt="Posterior View of Right Leg Bone Anatomy" /></div><div class="caption"><p>Posterior View of Right Leg Bone Anatomy. Anatomy includes tibia, fibula, femur, semimembranosus, styloid process, soleus, popliteus, popliteal, tibialis, flexor digitorum longus, flexor hallucis longus, peroneus longus, brevis, and talus. Gray's Anatomy</p></div></div></div><div class="whole_rhythm bk_prnt_obj"><div id="article-35887.image.f2" class="figure bk_fig"><div class="graphic"><img src="/books/NBK539776/bin/Gray439.jpg" alt="Image Gray439" /></div><div class="caption"><p>Posterior Muscles of the Leg, Popliteus, Tibialis Posterior, Peroneus Longus, Flexor Digitorum Longus, Flexor Hallucis Longus, Peroneus Brevis, Femur Henry Vandyke Carter, Public domain, via Wikimedia Commons</p></div></div></div><div class="whole_rhythm bk_prnt_obj"><div id="article-35887.image.f3" class="figure bk_fig"><div class="graphic"><img src="/books/NBK539776/bin/Gray1242.jpg" alt="Image Gray1242" /></div><div class="caption"><p>The mucous sheaths of the tendons around the ankle; Medial aspect, Exterior Hallucis Longus, Flexor digitorum longus, Tibialis posterior and Anterior, Flexor hallucis longus, Plantaris, Tendon calcaneus Henry Vandyke Carter, Public Domain, via Wikimedia Commons</p></div></div></div></div></div></div>
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</p></div><div class="small"><span class="label">Bookshelf ID: NBK539776</span><span class="label">PMID: <a href="https://pubmed.ncbi.nlm.nih.gov/30969598" title="PubMed record of this page" ref="pagearea=meta&targetsite=entrez&targetcat=link&targettype=pubmed">30969598</a></span></div></div></div>
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