Abdominal Wall

Question 1

Abdominal wall mm.

Answer 1

External abdominal oblique m.
Internal abdominal oblique m.
Transversus abdominis m.
Rectus abdominis m.

Question 2

Lateral cutaneous femoral nerve

Answer 2

Ventral branch of 4th lumbar spinal nerve
Cutaneous innervation from the lateral and cranial surface of the thigh and lateral surfaces of the hip and stifle

Question 3

External Abdominal Oblique m.

Answer 3

Covers ventral half of lateral thoracic wall and lateral part of abdominal wall; fibers run caudoventrally
Innervation: intercostal nn. and ventral brs. of lumbar spinal nerves
Action: Compression of abdominal viscera - aids in expiration, urination, defecation, parturition; flexion of vertebral column; lateral bending of vertebral column

Question 4

Internal Abdominal Oblique m.

Answer 4

Located medial to the external abdominal oblique m. over the lateral abdominal wall; fibers run craniolaterally
Innervation: last few intercostal nn. and ventral brs. of T13, L1-3
Action: Compression and support of the abdominal viscera

Question 5

Transversus abdominis m.

Answer 5

Deepest abdominal muscle; fibers run transversely
Innervation: last few intercostal nn. and ventral brs. of T13, L1-3
Action: compression and support of the abdominal viscera

Question 6

Rectus Abdominis m.

Answer 6

Courses between first costal cartilage and sternum and pecten ossis pubis; fibers run longitudinally
Innervation: Intercostal nn. and ventral brs. of T13, L1-3
Action: Compression and support of abdominal viscera; bring the pelvis forward, flexion of the back

Question 7

Rectus Sheath

Answer 7

Formed by aponeuroses of external and internal abdominal obliques and transversus abdominis mm.

Question 8

Linnea alba

Answer 8

Strip of collagenous tissue extending from xiphoid process to the cranial edge of the pelvic symphysis
Main insertion of external and internal abdominal obliques and transversus abdominis mm.

Question 9

Main blood supply to abdominal wall

Answer 9

Cranial (deep) epigastric a. (from internal thoracic a.)
Caudal (deep) epigastric a. (from pudendoepigastric trunk)
Cranial abdominal a. (from phrenicoabdominal a.)
Deep circumflex iliac a. (from aorta)

Question 10

Blood supply to ventral abdominal wall

Answer 10

Cranial and caudal superficial epigastric a.

Question 11

Superficial inguinal lymph nodes

Answer 11

Also called mammary lnn. or scrotal lnn. in females/males
Cranial to pecten ossis pubis; along dorsolateral border of penis in male
Usually 2 nodes
Drain ventral half of abdominal wall