| 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) |
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| 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) |
| musculus pubovaginalis | <anatomy> In the female, the most medial fibres of the levator ani (pubococcygeus) muscle that extend from the pubis into the lateral walls of the vagina. Synonym: musculus pubovaginalis, pubovaginal muscle. (05 Mar 2000) |
| musculus pubovesicalis | <anatomy> Smooth muscle fibres within the pubovesical ligament in the female. Synonym: musculus pubovesicalis, pubovesical muscle. (05 Mar 2000) |
| musculus pyramidalis | <anatomy, muscle> Origin, crest of pubis; insertion, lower portion of linea alba; action, makes linea alba tense; nerve supply, subcostal. Synonym: musculus pyramidalis, pyramidal muscle. (05 Mar 2000) |
| musculus pyramidalis auriculae | <anatomy> An occasional prolongation of the fibres of the tragicus to the spina helicis. Synonym: musculus pyramidalis auriculae, Jung's muscle, pyramidal muscle of auricle. (05 Mar 2000) |