gross 2 Pelvis Flashcards
insertion of the Coccygeus
coccyx and lower part of the sacrum
origin of the coccygeus muscle
ischial spine
and
sacrospinous ligament
nerve of the coccygeus
ventral primary rami of 3rd and 4th sacral nerves
function of the coccygeus
supports pelvic viscera
draws coccyx forward
origin of levator Ani muscle
body of pubis
arcus tendineus
ischial spine
insertion of Levator Ani muscle
coccyx and anococcygeal raphe
nerve of levator Ani muscle
ventral primary rami of 3rd and 4th sacral nerves
perineal branch of pudendal nerve
function of levator Ani muscle
- as a whole, supports pelvic viscera
- specialized parts of the levator ani perform other functions
what are the three parts to the Levator Ani muscle?
iliococcygeus
pubococcygeus
puborectalis
what is the most posterior part of the levator ani?
iliococcygeus
the pubococcygeus is the main part of the levator ani and its most medial fibers form what two things?
Levator Prostatae: inserts into prostate in the male
Pubovaginalis: inserts into urethra and vagina in female
what is the part of the levator ani formed when fibers from each side unite behind the anorectal junction to form the puborectal sling?
Puborectalis
what is the function of the puborectalis?
maintain the flexure at the anorectal junction, it relaxes during defecation. the things i could also say…
but seriously it also functions to direct the fetal head forward during birth
what is the curved thickening of the obturator fascia which gives origin to parts of the pubococcygeus and iliococcygeus
Arcus Tendineus
what is the continuation of smooth muscle layer of the rectum below the pelvic diaphragm
Sphincter Ani internus:
under involuntary control
The sphincter Ani externus surrounds the anal canal and consists of what three parts?
Subcutaneous
superficial
deep
origin of the superficial transverse perineus muscle
ischial tuberosity
insertion of superficial transverse perineus muscle
central tendon of the perineum
nerve of superficial transverse perineus muscle
perineal branch of pudendal nerve
function of superficial transverse perineus muscle
stabilizes the central tendon of the perineum
origin of the ischiocavernosus
medial surface of ischial tuberosity and ischiopubic ramus
insertion of ischiocavernosus
crus of the penis or clitoris
nerve of ischiocavernosus muscle
perineal branch of pudendal nerve
function of ischiocavernosus muscle
impedes venous return, by compressing the crus of the penis or clitoris, thereby maintaining erection
origin of bulbospongiosus muscle
central tendon of the perineum
median raphe of the bulb of the penis
insertion of the bulbospongiosus
corpus spongiosum
deep fascia on dorsum of penis
nerve of Bulbospongiosus muscle
perineal branch of pudendal nerve
function of bulbospongiosus
impedes venous return by compressing the buld of the penis, thereby maintaining erection.
It also constricts the Corpus Spongiosum to empty the urethra at the end of micturition and ejaculation
origin of Bulbospongiosus in female
central tendon of the perineum
Fibers surround the bulb of the vestibule and vagina
insertion of bulbospongiosus in female
pubic arch and corpus cavernosum of clitoris
nerve of the bulbospongiosus in females
perineal branch of the pudendal
SAME
function of the Bulbospongiosus in female
constricts the vaginal orifice and maintains erection of the clitoris
origin of deep transverse perineus muscle
medial surface of ischial ramus
insertion of deep transverse perineus muscle
central tendon of the perineum and median raphe (males)
walls of the vagina (female)
nerve of the deep transverse perineus muscle
perineal branch of the pudendal
function of deep transverse perineus muscle
stabilizes the central tendon of the perineum and supports the prostate gland or vagina
origin of sphincter Urethrae muscle
inferior pubic ramus
fibers encircle urethra
insertion of sphincter Urethrae muscle
median Raphe
walls of vagina
nerve of sphincter Urethrae Muscle
perineal branch of pudendal
function of sphincter Urethrae muscle
compresses urethra at the end of micturition
