Anatomy - 1

S4
internal anal - splachnic nerves
external anal - inferior rectal

nerve + perineal nerve

Origin of anterior labial and
anterior scrotal nerves

ilioinguinal nerve

Origin of posterior labial and
posterior scrotal nerves

s2-4> pudendal nerve>perineal
nerve> posterior labial/scrotal

nerves

Is urination mediated by
parasympathetic or sympathetic

fibers?

peeing = parasympathetic

What are the routes of the
brachial plexus?

C5 -T1 (ventral rami)

Which nerves are typically
damaged in shoulder dystocia

(erb's palsy)?

C5-6





What is the inguinal canal formed
from?

Aponeurosis of the external
oblique muscle

Which muscles make up the
anterior abdominal wall?

rectus abdominis (rectus sheath)
external oblique (medial
downward)

Internal oblique (medial upward)
TRansverse abdominus
(horizontally)

What are the most superficial
layers of the abdominal wall?

skin > campers fascia > scarpa's
fascia (membranous superficial

fascia)

Contents of the inguinal canal in
females

Round ligament + ilioinguinal
nerve

Contents of the inguinal canal in
males

spermatic cord + ilioinguinal nerve

What is the rectus sheath made
up of?

Aponeurosis of the
external/internal oblique and

transverse abdominus

What is the significance of the
Arcuate line

Where the rectus sheath ends, site
where inferior epigastric vessels
perforate rectus abdominus,
rectus abdominus msucles are no
longer contained within the
internal oblique muscles inferior

to the arcuate line, the
aponeurosis of the internal
oblique and traverse abdominus
muscles move anterior to the

rectus abdominus.

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Position of the arcuate line

1/3 distance from umbilicus to
pubic crest





Which arteries supply the scrotum

anterior scrotal
posterior scrotal

testicular

Origin of anterior scrotal artery

Deep external pudendal

Origin of the posterior scrotal
artery

internal pudendal

Origin of internal pudendal artery

internal iliac (anterior branch)

Posterior branches of the internal
iliac artery

iliolumbar, lateral sacral, posterior
gluteal

Origin of middle rectal artery

internal pudendal artery (anterior
branch)

Origin of superior rectal artery

inferior mesenteric artery

Which blood vessel crosses the
ureter in the pelvis?

uterine artery anteriorly

origin of the uterine artery