{"id":726621,"date":"2024-07-19T18:32:21","date_gmt":"2024-07-19T13:02:21","guid":{"rendered":"https:\/\/infinitylearn.com\/surge\/?p=726621"},"modified":"2025-06-26T14:24:24","modified_gmt":"2025-06-26T08:54:24","slug":"7-vestigial-features-of-the-human-body","status":"publish","type":"post","link":"https:\/\/infinitylearn.com\/surge\/science\/7-vestigial-features-of-the-human-body\/","title":{"rendered":"7 Vestigial Features of the Human Body"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_37 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" style=\"display: none;\"><label for=\"item\" aria-label=\"Table of Content\"><span style=\"display: flex;align-items: center;width: 35px;height: 30px;justify-content: center;\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/label><input type=\"checkbox\" id=\"item\"><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' style='display:block'><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/infinitylearn.com\/surge\/science\/7-vestigial-features-of-the-human-body\/#Top_7_Vestigial_Features_of_the_Human_Body\" title=\"Top 7 Vestigial Features of the Human Body\">Top 7 Vestigial Features of the Human Body<\/a><ul class='ez-toc-list-level-3'><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/infinitylearn.com\/surge\/science\/7-vestigial-features-of-the-human-body\/#1_Pyramidalis_Muscle\" title=\"1. Pyramidalis Muscle\">1. Pyramidalis Muscle<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/infinitylearn.com\/surge\/science\/7-vestigial-features-of-the-human-body\/#2_Auricular_Muscles\" title=\"2. Auricular Muscles\">2. Auricular Muscles<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/infinitylearn.com\/surge\/science\/7-vestigial-features-of-the-human-body\/#3_Palmaris_Longus_Muscle\" title=\"3. Palmaris Longus Muscle\">3. Palmaris Longus Muscle<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/infinitylearn.com\/surge\/science\/7-vestigial-features-of-the-human-body\/#4_Nictitating_Membrane\" title=\"4. Nictitating Membrane\">4. Nictitating Membrane<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/infinitylearn.com\/surge\/science\/7-vestigial-features-of-the-human-body\/#5_Tails\" title=\"5. Tails\">5. Tails<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/infinitylearn.com\/surge\/science\/7-vestigial-features-of-the-human-body\/#6_Wisdom_Teeth\" title=\"6. Wisdom Teeth\">6. Wisdom Teeth<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/infinitylearn.com\/surge\/science\/7-vestigial-features-of-the-human-body\/#7_Palmar_Grasp_Reflex\" title=\"7. Palmar Grasp Reflex\">7. Palmar Grasp Reflex<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/infinitylearn.com\/surge\/science\/7-vestigial-features-of-the-human-body\/#FAQs_on_7_Vestigial_Features_of_the_Human_Body\" title=\"FAQs on 7 Vestigial Features of the Human Body\">FAQs on 7 Vestigial Features of the Human Body<\/a><ul class='ez-toc-list-level-3'><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/infinitylearn.com\/surge\/science\/7-vestigial-features-of-the-human-body\/#What_are_the_vestigial_parts_of_the_human_body\" title=\"What are the vestigial parts of the human body?\">What are the vestigial parts of the human body?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/infinitylearn.com\/surge\/science\/7-vestigial-features-of-the-human-body\/#Which_3_are_vestigial_structures\" title=\"Which 3 are vestigial structures?\">Which 3 are vestigial structures?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/infinitylearn.com\/surge\/science\/7-vestigial-features-of-the-human-body\/#Is_hair_a_vestigial_organ\" title=\"Is hair a vestigial organ?\">Is hair a vestigial organ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/infinitylearn.com\/surge\/science\/7-vestigial-features-of-the-human-body\/#What_are_examples_of_vestigial_organs\" title=\"What are examples of vestigial organs?\">What are examples of vestigial organs?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<p>Vestiges are remnants of our evolutionary past\u2014derived from the Latin word for &#8220;footprints&#8221; or &#8220;tracks.&#8221; All species have <a href=\"https:\/\/infinitylearn.com\/surge\/biology\/vestigial-organs\/\"><strong>vestigial features<\/strong><\/a>, which can be anatomical, physiological, or behavioral. Humans alone exhibit over 100 vestigial traits. Here, we explore seven notable examples.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Top_7_Vestigial_Features_of_the_Human_Body\"><\/span>Top 7 Vestigial Features of the Human Body<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Below are the following list of 7 Vestigial Features of the Human Body-<\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-726629\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2024\/07\/7-Vestigial-Features-of-the-Human-Body.jpg\" alt=\"Vestigial Features of the Human Body\" width=\"1024\" height=\"640\" srcset=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2024\/07\/7-Vestigial-Features-of-the-Human-Body.jpg 1024w, https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2024\/07\/7-Vestigial-Features-of-the-Human-Body-300x188.jpg 300w, https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2024\/07\/7-Vestigial-Features-of-the-Human-Body-768x480.jpg 768w, https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2024\/07\/7-Vestigial-Features-of-the-Human-Body-150x94.jpg 150w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/p>\n<h3><span class=\"ez-toc-section\" id=\"1_Pyramidalis_Muscle\"><\/span>1. Pyramidalis Muscle<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The pyramidalis <a href=\"https:\/\/infinitylearn.com\/surge\/biology\/muscular-system\/\"><strong>muscle<\/strong> <\/a>is a paired, triangular muscle located in the lower abdomen between the rectus abdominis muscle and its sheath. The presence and size of the pyramidalis muscles vary among individuals; some may have two, one, or none at all. These muscles are believed to contract the linea alba, but this function is considered insignificant to the overall function of the abdominal muscles. Researchers estimate that one or both pyramidalis muscles are present in approximately 80 percent of the human population.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"2_Auricular_Muscles\"><\/span>2. Auricular Muscles<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The auricular, or extrinsic, muscles of the human ear consist of the anterior, superior, and posterior auricular muscles, which control the pinna\u2014the visible part of the <strong>ear<\/strong>. In many <strong>mammals<\/strong>, these muscles assist in sound localization and emotional expression through ear movements. However, in humans, they are largely nonfunctional.<\/p>\n<p><a href=\"https:\/\/infinitylearn.com\/surge\/biology\/charles-darwin-theory\/\"><strong>Charles Darwin<\/strong><\/a> suggested that humans compensate for this by moving their heads to better capture sounds, reducing the necessity of auricular muscle functionality. Despite this, with practice, some people can regain a limited ability to wiggle their ears.<\/p>\n<p style=\"text-align: center;\"><em><strong>Also Read: <a href=\"https:\/\/infinitylearn.com\/surge\/science\/\">Science Topics<\/a><\/strong><\/em><\/p>\n<h3><span class=\"ez-toc-section\" id=\"3_Palmaris_Longus_Muscle\"><\/span>3. Palmaris Longus Muscle<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Research has shown that the palmaris longus, a slender muscle extending from the wrist to the elbow, is absent in approximately 10 percent of people. This muscle likely played a role in enhancing grip, possibly aiding in activities like hanging. However, its absence does not affect grip strength in modern humans. Nowadays, the palmaris longus is often used as a source of tissue for tendon grafts in reconstructive surgeries due to its redundancy in function.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"4_Nictitating_Membrane\"><\/span>4. Nictitating Membrane<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The plica semilunaris is a small fold of conjunctiva located at the inner corner of the <strong>human eye<\/strong>. It resembles the nictitating membrane, or third eyelid, found in many animals, suggesting it may be a vestigial remnant of this structure. While some primates, like gorillas, retain a functional nictitating membrane, in chimpanzees\u2014close relatives of humans\u2014the plica semilunaris is also vestigial.<\/p>\n<p>The nictitating membrane in various <strong>animals<\/strong> serves protective roles, such as keeping the eye clean and moist or hiding the iris from predators. In certain species, it is transparent enough to allow vision underwater or underground. The loss of the nictitating <a href=\"https:\/\/infinitylearn.com\/surge\/biology\/membrane\/\"><strong>membrane<\/strong><\/a> in humans is not well understood, but changes in habitat and eye physiology may have made this structure unnecessary.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"5_Tails\"><\/span>5. Tails<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>During the sixth week of gestation, a <a href=\"https:\/\/infinitylearn.com\/surge\/biology\/embryo-in-humans-and-animals\/\"><strong>human embryo<\/strong><\/a> develops a tail, containing several vertebrae. However, within a few weeks, this tail diminishes, and the vertebrae fuse to form the coccyx, or tailbone, in adults. Humans and their ape relatives are unique among primates for their lack of a tail, though the reason for this evolutionary trait remains unclear.<\/p>\n<p>Occasionally, a human infant is born with a vestigial tail, which generally lacks vertebrae and is harmless, though it can sometimes be linked to spina bifida, a condition where the vertebrae do not completely encase the <a href=\"https:\/\/infinitylearn.com\/surge\/articles\/spinal-cord\/\"><strong>spinal cord<\/strong><\/a>. These tails are usually removed surgically without complications.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"6_Wisdom_Teeth\"><\/span>6. Wisdom Teeth<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>As humans migrated out of <a href=\"https:\/\/infinitylearn.com\/surge\/science\/africa\/\"><strong>Africa<\/strong><\/a> and settled in diverse habitats, their diet shifted towards softer, processed foods. This dietary change reduced the need for large, powerful jaws, leading to a decrease in jaw size. Consequently, molars, especially third molars or <a href=\"https:\/\/infinitylearn.com\/surge\/articles\/human-teeth\/\"><strong>wisdom teeth<\/strong><\/a>, often became impacted and are now frequently absent at birth. Due to these changes, wisdom teeth are considered a vestigial feature of the <strong>human body<\/strong>.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"7_Palmar_Grasp_Reflex\"><\/span>7. Palmar Grasp Reflex<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The palmar grasp reflex is a notable behavior in human infants, developing as early as 16 weeks into gestation when the fetus starts grasping the umbilical cord in the womb. Research has shown that newborns can support their weight for at least 10 seconds using this reflex by gripping a horizontal rod. In contrast, <strong>monkey<\/strong> infants, who also exhibit this behavior, can hang from one hand for over half an hour.<\/p>\n<p>This reflex is vital for monkey infants to cling to their mother&#8217;s fur. Humans, having evolved away from an arboreal lifestyle and losing body fur, do not require such a strong grasp. Typically, human infants begin to lose this reflex around three months of age. Despite its early loss, some researchers believe that the grasp reflex may still serve important functions in humans.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"FAQs_on_7_Vestigial_Features_of_the_Human_Body\"><\/span>FAQs on 7 Vestigial Features of the Human Body<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\t\t<section class=\"sc_fs_faq sc_card \">\n\t\t\t<div>\n\t\t\t\t<h3><span class=\"ez-toc-section\" id=\"What_are_the_vestigial_parts_of_the_human_body\"><\/span>What are the vestigial parts of the human body?<span class=\"ez-toc-section-end\"><\/span><\/h3>\t\t\t\t<div>\n\t\t\t\t\t\t\t\t\t\t<p>\n\t\t\t\t\t\tVestigial parts of the human body include the appendix, wisdom teeth, coccyx (tailbone), ear muscles, and the palmar grasp reflex. These structures are remnants of our evolutionary past .\t\t\t\t\t<\/p>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"sc_fs_faq sc_card \">\n\t\t\t<div>\n\t\t\t\t<h3><span class=\"ez-toc-section\" id=\"Which_3_are_vestigial_structures\"><\/span>Which 3 are vestigial structures?<span class=\"ez-toc-section-end\"><\/span><\/h3>\t\t\t\t<div>\n\t\t\t\t\t\t\t\t\t\t<p>\n\t\t\t\t\t\tThree well-known vestigial structures are the appendix, wisdom teeth, and the tailbone (coccyx).\t\t\t\t\t<\/p>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"sc_fs_faq sc_card \">\n\t\t\t<div>\n\t\t\t\t<h3><span class=\"ez-toc-section\" id=\"Is_hair_a_vestigial_organ\"><\/span>Is hair a vestigial organ?<span class=\"ez-toc-section-end\"><\/span><\/h3>\t\t\t\t<div>\n\t\t\t\t\t\t\t\t\t\t<p>\n\t\t\t\t\t\tHuman body hair is considered vestigial because it no longer serves the same function of insulation and protection that it did for our fur-covered ancestors.\t\t\t\t\t<\/p>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"sc_fs_faq sc_card \">\n\t\t\t<div>\n\t\t\t\t<h3><span class=\"ez-toc-section\" id=\"What_are_examples_of_vestigial_organs\"><\/span>What are examples of vestigial organs?<span class=\"ez-toc-section-end\"><\/span><\/h3>\t\t\t\t<div>\n\t\t\t\t\t\t\t\t\t\t<p>\n\t\t\t\t\t\tExamples of vestigial organs include the appendix, wisdom teeth, coccyx, palmar grasp reflex, and ear muscles .\t\t\t\t\t<\/p>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/section>\n\t\t\n<script type=\"application\/ld+json\">\n\t{\n\t\t\"@context\": \"https:\/\/schema.org\",\n\t\t\"@type\": \"FAQPage\",\n\t\t\"mainEntity\": [\n\t\t\t\t\t{\n\t\t\t\t\"@type\": \"Question\",\n\t\t\t\t\"name\": \"What are the vestigial parts of the human body?\",\n\t\t\t\t\"acceptedAnswer\": {\n\t\t\t\t\t\"@type\": \"Answer\",\n\t\t\t\t\t\"text\": \"Vestigial parts of the human body include the appendix, wisdom teeth, coccyx (tailbone), ear muscles, and the palmar grasp reflex. These structures are remnants of our evolutionary past .\"\n\t\t\t\t\t\t\t\t\t}\n\t\t\t}\n\t\t\t,\t\t\t\t{\n\t\t\t\t\"@type\": \"Question\",\n\t\t\t\t\"name\": \"Which 3 are vestigial structures?\",\n\t\t\t\t\"acceptedAnswer\": {\n\t\t\t\t\t\"@type\": \"Answer\",\n\t\t\t\t\t\"text\": \"Three well-known vestigial structures are the appendix, wisdom teeth, and the tailbone (coccyx).\"\n\t\t\t\t\t\t\t\t\t}\n\t\t\t}\n\t\t\t,\t\t\t\t{\n\t\t\t\t\"@type\": \"Question\",\n\t\t\t\t\"name\": \"Is hair a vestigial organ?\",\n\t\t\t\t\"acceptedAnswer\": {\n\t\t\t\t\t\"@type\": \"Answer\",\n\t\t\t\t\t\"text\": \"Human body hair is considered vestigial because it no longer serves the same function of insulation and protection that it did for our fur-covered ancestors.\"\n\t\t\t\t\t\t\t\t\t}\n\t\t\t}\n\t\t\t,\t\t\t\t{\n\t\t\t\t\"@type\": \"Question\",\n\t\t\t\t\"name\": \"What are examples of vestigial organs?\",\n\t\t\t\t\"acceptedAnswer\": {\n\t\t\t\t\t\"@type\": \"Answer\",\n\t\t\t\t\t\"text\": \"Examples of vestigial organs include the appendix, wisdom teeth, coccyx, palmar grasp reflex, and ear muscles .\"\n\t\t\t\t\t\t\t\t\t}\n\t\t\t}\n\t\t\t\t\t\t]\n\t}\n<\/script>\n\n","protected":false},"excerpt":{"rendered":"<p>Vestiges are remnants of our evolutionary past\u2014derived from the Latin word for &#8220;footprints&#8221; or &#8220;tracks.&#8221; All species have vestigial features, [&hellip;]<\/p>\n","protected":false},"author":52,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"Vestigial","_yoast_wpseo_title":"7 Vestigial Features of the Human Body and Their Functions","_yoast_wpseo_metadesc":"Discover 7 vestigial features of the human body: appendix, wisdom teeth, coccyx, palmar grasp reflex, ear muscles, arrector pili, and plica semilunaris, revealing our evolutionary 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