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Body Atlas, Muscle Reference

Muscles

Complete muscle reference, origins, insertions, nerve supply, actions, clinical notes, and common injuries.

342 muscles
342 muscles
Muscle Obliquus Capitis Inferior musculus obliquus capitis inferior Neck The obliquus capitis inferior is the largest of the four suboccipital muscles and the only one… Muscle Obliquus Capitis Superior musculus obliquus capitis superior Neck The obliquus capitis superior is one of the four suboccipital muscles, forming the superolateral boundary of… Muscle Obturator Externus musculus obturator externus Pelvis & Hip The obturator externus is a flat, fan-shaped muscle on the outer surface of the pelvis that… Muscle Obturator Externus (Full) musculus obturator externus Pelvis & Hip The obturator externus is the deepest external hip rotator, inserting in the trochanteric fossa deep to… Muscle Obturator Internus musculus obturator internus Pelvis & Hip The obturator internus originates inside the pelvis on the inner surface of the obturator membrane, makes… Muscle Obturator Internus (Full) musculus obturator internus Pelvis & Hip The obturator internus makes a 90-degree turn around the lesser sciatic notch (using the bone as… Muscle Occipitofrontalis musculus occipitofrontalis Head & Skull The occipitofrontalis is the complete epicranial muscle, consisting of the frontal belly (frontalis) anteriorly and the… Muscle Omohyoid musculus omohyoideus Neck The omohyoid is a digastric muscle with two bellies and an intermediate tendon, running from the… Muscle Opponens Digiti Minimi musculus opponens digiti minimi Hand & Wrist The opponens digiti minimi is the deepest hypothenar muscle, inserting along the entire fifth metacarpal shaft… Muscle Opponens Digiti Minimi (Foot) musculus opponens digiti minimi pedis Foot & Ankle The opponens digiti minimi of the foot opposes the fifth metatarsal to help cup the lateral… Muscle Opponens Digiti Minimi (Hand) musculus opponens digiti minimi manus Hand & Wrist The opponens digiti minimi wraps around the fifth metacarpal to rotate and flex it at the… Muscle Opponens Pollicis musculus opponens pollicis Hand & Wrist The opponens pollicis is the deepest thenar muscle and the one most responsible for the medial… Muscle Opponens Pollicis (Full) musculus opponens pollicis Hand & Wrist The opponens pollicis is the thenar muscle that produces the defining human function of precision pinch… Muscle Orbicularis Oculi musculus orbicularis oculi Head & Skull The orbicularis oculi is the sphincter muscle of the eyelid, forming an elliptical ring around the… Muscle Orbicularis Oris musculus orbicularis oris Head & Skull The orbicularis oris is a complex elliptical muscle surrounding the mouth, built from contributions of the… Muscle Orbicularis Oris (Full) musculus orbicularis oris Head & Skull The orbicularis oris is the lip sphincter, formed by interlacing fibres from the surrounding facial muscles… Muscle Palatoglossus musculus palatoglossus Head & Skull The palatoglossus forms the palatoglossal arch (anterior pillar of the fauces) and is the only tongue… Muscle Palatopharyngeus musculus palatopharyngeus Head & Skull The palatopharyngeus forms the palatopharyngeal arch (posterior pillar of the fauces) and connects the soft palate… Muscle Palmar Interossei musculi interossei palmares Hand & Wrist The three palmar interossei are unipennate muscles adducting the index, ring, and little fingers toward the… Muscle Palmaris Brevis musculus palmaris brevis Hand & Wrist The palmaris brevis is a small, thin subcutaneous muscle at the medial palm that inserts directly… Muscle Palmaris Brevis musculus palmaris brevis Hand & Wrist The palmaris brevis is the only intrinsic muscle inserting into palm skin, cupping the hypothenar eminence… Muscle Palmaris Longus musculus palmaris longus Forearm The palmaris longus is a slender, inconstant forearm muscle absent in roughly 14 percent of people… Muscle Pectineus musculus pectineus Thigh The pectineus is a flat, quadrangular muscle forming the medial wall of the femoral triangle, running… Muscle Pectineus (Full) musculus pectineus Thigh The pectineus is the most superior adductor, lying in the floor of the femoral triangle and…
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