| 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) |
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| 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) |
| musculus pyramidalis nasi | <anatomy> Insertion, into frontalis; action, assists frontalis; origin, from membrane covering bridge of nose; nerve supply, branch of facial. Synonym: musculus procerus, musculus pyramidalis nasi, procerus. (05 Mar 2000) |
| musculus pyriformis | <anatomy, muscle> Origin, margins of pelvic sacral foramina and greater sciatic notch of ilium; insertion, upper border of greater trochanter; action, rotates thigh laterally; nerve supply, nerve to piriformis (sciatic plexus). Synonym: musculus piriformis, musculus pyriformis, piriform muscle. (05 Mar 2000) |
| musculus quadratus | <anatomy> A muscle that is more or less square in shape. Synonym: musculus quadratus, quadrate muscle. (05 Mar 2000) |
| musculus quadratus femoris | <anatomy> Insertion, intertrochanteric ridge; origin, lateral border of tuberosity of ischium; action, rotates thigh laterally; nerve supply, nerve to quadratus femoris (sacral plexus). Synonym: musculus quadratus femoris, quadrate muscle of thigh. (05 Mar 2000) |
| musculus quadratus labii inferioris | <anatomy, muscle> Origin, anterior portion of lower border of mandible; insertion, orbicularis oris musculus and skin of lower lip; action, depresses lower lip; nerve supply, facial. Synonym: musculus depressor labii inferioris, depressor muscle of lower lip, musculus quadratus labii inferioris, musculus quadratus menti. (05 Mar 2000) |
| musculus quadratus labii superioris | Composed of three heads usually described as three separate muscles; they are the caput angulare or levator labii superioris alaeque nasi muscle; caput infraorbitale or levator labii superioris muscle; caput zygomaticum or zygomaticus minor muscle. Synonym: quadrate muscle of upper lip. (05 Mar 2000) |
| musculus quadratus lumborum | <anatomy, muscle> Origin, iliac crest, iliolumbar ligament, and transverse processes of lower lumbar vertebrae; insertion, twelfth rib and transverse processes of upper lumbar vertebrae; action, abducts trunk; nerve supply, ventral primary rami of upper lumbar spinal nerves. Synonym: musculus quadratus lumborum, lumbar quadrate muscle, quadrate muscle of loins. (05 Mar 2000) |
| musculus quadratus menti | <anatomy, muscle> Origin, anterior portion of lower border of mandible; insertion, orbicularis oris musculus and skin of lower lip; action, depresses lower lip; nerve supply, facial. Synonym: musculus depressor labii inferioris, depressor muscle of lower lip, musculus quadratus labii inferioris, musculus quadratus menti. (05 Mar 2000) |
| musculus quadratus plantae | <anatomy, muscle> Origin, by two heads from the lateral and medial borders of the inferior surface of the calcaneus; insertion, tendons of flexor digitorum longus; action, assists long flexor; nerve supply, lateral plantar. Synonym: musculus flexor accessorius, musculus quadratus plantae, accessory flexor muscle of foot, caro quadrata sylvii, musculus pronator pedis, plantar quadrate muscle, quadrate muscle of sole. (05 Mar 2000) |
| musculus quadriceps extensor femoris | <anatomy, muscle> Origin, by four heads: rectus femoris, vastus lateralis, vastus intermedius, and vastus medialis; insertion, patella, and thence by ligamentum patellae to tuberosity of tibia; action, extends leg; flexes thigh by action of rectus femoris; nerve supply, femoral. Synonym: musculus quadriceps femoris, musculus quadriceps extensor femoris, quadriceps muscle of thigh. (05 Mar 2000) |