Anatomy: Pelvis Lower Leg Muscles Flashcards Preview

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Flashcards in Anatomy: Pelvis Lower Leg Muscles Deck (12):
1

Coccygeus

Innervation: s4,s5Action:Part of pelvic diaphragmthat supports pelvicviscera; flexes coccyxProx: Ischial SpineDistal: Sacrum and Coccyx

2

Illiococcygeus

N: Nerve to Levator Ani (S4), Inferiorrectal n, coccygeal plexusA:Forms most of pelvicdiaphragm that supportspelvic viscera and resistsincreases in intra-abdominal pressureProx: Tendinous Arch of obturator fascia; ishial spineDistal: Coccyx; anocooccygeal lig.

3

Obturator Internus

N: Nerve to Obturator InternusA: Rotates thigh laterally, and abbducts flexed thigh; assists in holding head of femur in acetabulum.Prox: Pelvic surfaces of ilium and ischium; obturator membraneDistal: Greater trochanter of femur

4

Piriformis

N: Anterior rami of s1-s2A: Laterally rotate extended thigh and abduct flexed thigh; assists in holding head of femur in acetabulumP: Sacrum and sacrotuberous lig.D: Greater trochanter of femur

5

Pubococcygeus

N: N. to levator ani (s4), inf. rectal, coccygeal plexusA: Forms most of pelvic diaphragm that supports pelvic viscera and resists increases in intra-abdominal pressureP: Body of pubis; tendinous arch of obturator fasciaD: Coccyx and sacrum

6

Puborectalis

N: N. to levator ani, inf. rectal, coccygeal plexus.A: Forms most of pelvic diaphragm that supports pelvic viscera and resists increases in intra-abdominal pressureP: Body of pubisD: Coccyx, anococcygeal lig. walls of prostate or vagina, rectum and anal canal

7

Bulbo-Spongiosus

N: Deep Branch of Perineal nerve,a branch of pudendal n. (S2-S4).A: Female:Supports and fixes perineal body; "Sphincter" of vagina; assists in erection of clitoris, compresses greater vestibular gland.Male: Supports and fixes perineal body, compresses bulb of man junk (penis) to expel last drops of urine/semen, assists erection by compressing outflow via deep perineal vein and by pushing blood from bulb into body of penis.P: Female- Perineal body Male: Median raphae of bulb of penis; perineal bodyD: F: Pubic arch and fascia of corpura cavernosa of clitoris. M: Perineal membrane, corpus spongiosum and corpora cavernosa, and fascia of bulb of penis.

8

Deep Transverse Perineal Muscle

N: Deep branch of perineal nerve, a branch of pudendal n. A: Supports and fixes perineal body/pelvic floor to support abdominopelvic viscera and resist increased intra-abdominal pressure.P: Ishiopubic ramus and ischial tuberosity.D: Perineal body and external butthole (anal) sphincter.

9

External Anal Sphincter

N: Inferior rectal.A: Constricts anal canal during perstalsis, resisting defacation, supports and fixes perineal body and pelvic floor.P: Skin and fascia surrounding the bum bum (anus); coccyx via anococcygeal ligament.D: Perineal Body

10

Internal Anal Sphincter

N: Parasympathetic via pelvic splanchnicsA: Constrict anal canal

11

Ischiocavernosus

N: Deep branch of perineal nerveA: Maintains erection of penis or clitoris by compressing outflow veins and pushing blood from the root of penis or clitoris into body of penis or clitoris.P: Ishiopubic ramus and ischial tuberosity.D: Medial aspect of crus and perineal membrane medial to crus

12

Superficial Transverse Perineal Muscle

N: Deep branch of PerinealA: Supports and fixes perineal body/pelvic floor to support abdominopelvic viscera and resist increased intra-abdominal pressure.P: Ischiopubic ramus and ishial tuberosity.D: Perineal body