topic 27

Question 1

innervation of m. cutaneus trunci

Answer 1

C7/8: n. thor lateralis

Question 2

the 4 nerves of the lumbar plexus that innervate abd wall and how to find them

Answer 2

to abd muscles:

(1) a. abdominalis cranialis – n. iliohypogastricus cranialis

((4) a./v. circumflexa ilium profunda – N. femoris cutaneus lateralis - skin and motor to psoas major

(2) N. iliohypogastricus caudalis – caudal to the cranial one, parallell
(3) Caudal to n. ihgc is the n. ilioinguinalis
n. genitofemoralis - m. abd. olb. int: over iliopsoas caud in abd cav

Question 3

n. costoabdominalis

Answer 3

last branch traveling caud on arcus costae ultimae, ex nn. thoracici, r. dors, no.13

Question 4

abd wall mainly innervated by

Answer 4

thoracic/lumbar/sacral spinal nerves: cutaneal dorsal branch;

r. cut med for skin,
r. cut lat for muscle

(r. cut ventr for vertebrae)

Question 5

name the 4 regions of the rectus sheath

Answer 5

1. preumbilical
2. umbilical
3. postumbilical
4. prepubic

Question 6

main blood supply

Answer 6

A. abdominaliscranialis
A. epigastricacranialis
A. epigastricacaudalis
A. circumflexa ilium profunda