Anatomy Of Abdominal Wall (*muscles*)

Question 1

External Abdominal Oblique

Action:

Answer 1

Bilateral contraction - Trunk flexion, compresses abdominal viscera, expiration

Unilateral contraction - Trunk lateral flexion (ipsilateral), trunk rotation (contralateral)

Question 2

External Abdominal Oblique

Innervation:

Answer 2

Motor: 
Intercostal nerves (T7-T11), 
Subcostal nerve (T12) 

Sensory: Iliohypogastric nerve (L1)

Question 3

Internal aAbdominal Oblique

Action:

Answer 3

Bilateral contraction - Trunk flexion, compresses abdominal viscera, expiration Unilateral contraction - Trunk lateral flexion (ipsilateral), trunk rotation (ipsilateral)

Question 4

Internal aAbdominal Oblique

Innervation

Answer 4

Intercostal nerves (T7-T11),
subcostal nerve (T12), iliohypogastric nerve (L1), ilioinguinal nerve (L1)

Question 5

Transverse abdominis

Action

Answer 5

Bilateral contraction -
Compresses and support abdominal viscera ,
Expiration

Unilateral contraction -
Trunk Rotation (ipsilateral)

Question 6

Transverse abdominis

Innervation

Answer 6

Intercostal nerves (T7-T11),
subcostal nerve (T12), iliohypogastric nerve (L1), ilioinguinal nerve (L1)

Question 7

Rectus Abdominis and Pyramidalis

Function

Answer 7

Flexes trunk (lumbar vertebrae) and
compresses abdominal viscera; stabilizes and controls tilt of pelvis (antilordosis)

Question 8

Rectus Abdominis and Pyramidalis

Innervation

Answer 8

Intercostal nerves (T7-T11), subcostal nerve
(T12)

Question 9

Pyramidalis

Answer 9

Originates: from pubic crest and symphysis
Inserts: into linea alba —
Absent in 20% of people

Question 10

Anterolateral Abdominal Muscles

responsible for the

Answer 10

Support + tension of the anterior body wall.

Protect abdominal viscera from injury.

Compress abdominal contents to maintain or increase the intra-abdominal pressure

Other in notes

Question 11

Anterolateral Abdominal Muscles

In collaboration with the————— they stabilize the——————

Answer 11

back musculature

vertebral column and move the trunk.