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Body Atlas, Muscle Reference

Muscles

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

676 muscles

676 muscles

Muscle Posterior Scalene Detail musculus scalenus posterior detail Neck The posterior scalene inserts on the second rib (unlike the others which insert on the first… Muscle Procerus musculus procerus Head & Skull The procerus is a small pyramidal muscle at the bridge of the nose that pulls the… Muscle Procerus Detail musculus procerus detail Head & Skull The procerus produces horizontal wrinkles at the nasal root and depresses the medial brow. It is… Muscle Pronator Quadratus musculus pronator quadratus Forearm The pronator quadratus is a flat, square muscle binding the distal radius and ulna together, acting… Muscle Pronator Quadratus Deep Layer stratum profundum musculi pronatoris quadrati Forearm The deep head provides DRUJ compression — a function analogous to the rotator cuff at the… Muscle Pronator Teres musculus pronator teres Forearm The pronator teres is the primary pronator of the forearm, a two-headed muscle whose humeral and… Muscle Pronator Teres (Full) musculus pronator teres Forearm The pronator teres is the primary forearm pronator, inserting on the lateral radius to rotate it… Muscle Pronator Teres Humeral Head caput humerale m. pronatoris teretis Forearm The humeral head is the large component arising from the medial epicondyle. The median nerve passes… Muscle Pronator Teres Ulnar Head caput ulnare m. pronatoris teretis Forearm The ulnar head arises from the coronoid and forms the deep boundary of the inter-head interval… Muscle Psoas Major musculus psoas major Lower Back The psoas major is the primary hip flexor for everyday activities such as walking and stair… Muscle Psoas Major (Full) musculus psoas major Lower Back The psoas major is the only muscle connecting the lumbar spine to the lower limb, running… Muscle Psoas Major Abdominal Portion musculus psoas major (pars abdominalis) Abdomen The abdominal (lumbar) portion of psoas major occupies the retroperitoneal space lateral to the lumbar vertebral… Muscle Psoas Major Detail musculus psoas major detail Abdomen Psoas major originates along the entire lumbar spine, making it unique in spanning from thoracolumbar junction… Muscle Psoas Minor musculus psoas minor Lower Back The psoas minor is a vestigial muscle present in only approximately 60 percent of people, a… Muscle Pterygostapedius musculus pterygostapedius Head & Skull The pterygostapedius is a rare accessory muscle of the middle ear, variably connecting the pterygoid region… Muscle Pubococcygeus musculus pubococcygeus Pelvis & Hip The pubococcygeus is the central and most important component of the levator ani, running from the… Muscle Pubococcygeus Detail musculus pubococcygeus detail Abdomen The pubococcygeus is the anterior part of the levator ani, the most consistently described component. It… Muscle Puborectalis musculus puborectalis Pelvis & Hip The puborectalis is the deepest component of the levator ani and the most important muscle for… Muscle Puborectalis (Abdominal Component) musculus puborectalis Abdomen The puborectalis is the innermost component of the levator ani, forming a U-shaped sling around the… Muscle Puborectalis Detail musculus puborectalis detail Abdomen Puborectalis forms a U-shaped sling around the anorectal junction, creating the anorectal angle (normally 90 degrees)… Muscle Pyloric Sphincter musculus sphincter pylori Abdomen The pyloric sphincter is a tonically contracted ring of thickened circular smooth muscle at the gastroduodenal… Muscle Pyramidalis musculus pyramidalis Abdomen The pyramidalis is a small triangular muscle in the lower anterior abdominal wall, lying in front… Muscle Pyramidalis Detail musculus pyramidalis detail Abdomen The pyramidalis is a small triangular muscle absent in 20% of individuals, lying in front of… Muscle Quadratus Femoris musculus quadratus femoris Pelvis & Hip The quadratus femoris is a flat, square muscle running horizontally from the ischial tuberosity to the…

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