| musculus pronator quadratus | <anatomy, muscle> Origin, distal fourth of anterior surface of ulna; insertion, distal fourth of anterior surface of radius; action, pronates forearm; nerve supply, anterior interosseous. Synonym: musculus pronator quadratus, quadrate pronator muscle. (05 Mar 2000) |
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| musculus pronator radii teres | <anatomy, muscle> Origin, superficial (humeral) head (ulnar) from the common flexor origin on the medial epicondyle of the humerus, deep (ulnar) head from the medial side of the coronoid process of the ulna; insertion, middle of the lateral surface of the radius; action, pronates forearm; nerve supply, median. Synonym: musculus pronator teres, musculus pronator radii teres, round pronator muscle. (05 Mar 2000) |
| musculus pronator teres | <anatomy, muscle> Origin, superficial (humeral) head (ulnar) from the common flexor origin on the medial epicondyle of the humerus, deep (ulnar) head from the medial side of the coronoid process of the ulna; insertion, middle of the lateral surface of the radius; action, pronates forearm; nerve supply, median. Synonym: musculus pronator teres, musculus pronator radii teres, round pronator muscle. (05 Mar 2000) |
| musculus prostaticus | The smooth muscle in the stroma of the prostate. Synonym: substantia muscularis prostatae, musculus prostaticus. (05 Mar 2000) |
| musculus psoas major | <anatomy, muscle> Origin, bodies of vertebrae and intervertebral disks from the twelfth thoracic to the fifth lumbar, and transverse processes of the lumbar vertebrae; insertion, forms a common insertion with iliacus muscle into lesser trochanter of femur; action, flexes hip joint; nerve supply, lumbar plexus (ventral rami of first, second and usually third lumbar spinal nerves). Synonym: musculus psoas major, greater psoas muscle. (05 Mar 2000) |
| musculus psoas minor | <anatomy> An inconstant muscle, absent in about 40%; origin, bodies of twelfth thoracic and first lumbar vertebrae and disk between them; insertion, iliopubic eminence via iliopectineal arch (iliac fascia); action, assists in flexion of lumbar spine; nerve supply, lumbar plexus. Synonym: musculus psoas minor, smaller psoas muscle. (05 Mar 2000) |
| musculus pterygoideus externus | <anatomy, muscle> Origin, inferior head from lateral lamina of pterygoid process; superior head from infratemporal crest and adjacent greater wing of the sphenoid; insertion, into pterygoid pit of mandible and articular disk; action, brings jaw forward, opens jaw; nerve supply, nerve to lateral pterygoid from mandibular division of trigeminal. Synonym: musculus pterygoideus lateralis, external pterygoid muscle, musculus pterygoideus externus. (05 Mar 2000) |
| musculus pterygoideus internus | <anatomy, muscle> Origin, pterygoid fossa of sphenoid and tuberosity of maxilla; insertion, medial surface of mandible between angle and mylohyoid groove; action, elevates mandible closing jaw; nerve supply, nerve to medial pterygoid from mandibular division of trigeminal. Synonym: musculus pterygoideus medialis, internal pterygoid muscle, musculus pterygoideus internus. (05 Mar 2000) |
| musculus pterygoideus lateralis | <anatomy, muscle> Origin, inferior head from lateral lamina of pterygoid process; superior head from infratemporal crest and adjacent greater wing of the sphenoid; insertion, into pterygoid pit of mandible and articular disk; action, brings jaw forward, opens jaw; nerve supply, nerve to lateral pterygoid from mandibular division of trigeminal. Synonym: musculus pterygoideus lateralis, external pterygoid muscle, musculus pterygoideus externus. (05 Mar 2000) |
| musculus pterygoideus medialis | <anatomy, muscle> Origin, pterygoid fossa of sphenoid and tuberosity of maxilla; insertion, medial surface of mandible between angle and mylohyoid groove; action, elevates mandible closing jaw; nerve supply, nerve to medial pterygoid from mandibular division of trigeminal. Synonym: musculus pterygoideus medialis, internal pterygoid muscle, musculus pterygoideus internus. (05 Mar 2000) |
| musculus pterygopharyngeus | See: superior constrictor muscle of pharynx. (05 Mar 2000) |
| musculus pterygospinosus | A muscular slip, occasionally present, passing between the spine of the sphenoid bone and the posterior margin of the lateral pterygoid plate. (05 Mar 2000) |
| musculus pubococcygeus | <anatomy> Fibres of the levator ani, arising from the pelvic surface of the body of the pubis and adjacent tendinous arch of obturator fascia, attaching to the coccyx. Synonym: musculus pubococcygeus, pubococcygeal muscle. (05 Mar 2000) |
| musculus puboprostaticus | <anatomy> Smooth muscle fibres within the puboprostatic ligament. Synonym: musculus puboprostaticus. (05 Mar 2000) |
| musculus puborectalis | <anatomy> The medial part of the musculus levator ani (pubococcygeus muscle) that passes from the body of the pubis around the anus to form a muscular sling at the level of the anorectal junction; it contracts to increase the perineal flexure during a peristalsis to maintain faecal continence and relaxes to allow defecation. Synonym: musculus puborectalis, Braune's muscle, puborectal muscle. (05 Mar 2000) |