Anatomy Flashcards
What is the relationship of the pudendal nerve to the pudendal artery?
Medial
What are the nerve roots of the pudendal nerve?
Ventral rami (anterior divisions) S2-S4
What is the anatomical course of the pudendal nerve?
Forms, passes between piriformis and ischiococcygeus
Exits pelvis via greater sciatic foramen
Crosses the sacrospinous ligament
Re-enters the pelvis via lesser sciatic foramen
Pudendal/Alcock canal with internal pudendal artery and vein
Gives off inferior rectal nerve and perineal nerve
Continues as the dorsal nerve of the penis or clitoris
What muscles does the pudendal nerve innervate?
Bulbospongiosus
Ischiocavernosus
Levator ani muscles (also receive innervation from anterior ramus of S4)
External urethral sphincter
Branch of inferior rectal nerve - external anal sphincter
What is the saying for the pudendal nerve?
S2, S3, S4 keeps the poo off the floor!
(i.e. nerve supply to external urethral sphincter and inferior rectal nerve to external anal sphincter)
What muscles make up the levator ani?
Iliococcygeus
Pubococcygeus
Puborectalis
At what level does the aorta terminate?
L4
What are the terminal branches of the aorta?
R and L common iliac arteries
Median sacral artery
What are the branches of the abdominal aorta?
Which ascending artery can be damaged during open appendicectomy?
Deep circumflex
When you hold the bony pelvis in anatomical position which two landmarks are at the same level horizontally?
Symphysis pubis and ischial spines
What is the submentobregmatic diameter?
9.5cm
What forms a dimple in the gluteal region?
Posterior superior iliac spines
What are the branches of the coeliac trunk?
Left gastric, splenic, and common hepatic arteries
At what level do the common iliacs bifurcate?
L5-S1
