Abdominal wall Posterior

Identify the following abdominal wall muscles, innervation and the corresponding actions

Iliacus-

Innervation: Femoral nerve (L2-L4)

Action: Hip flexion, Stabilization of the hip

Psoas-

●Actions:

○Hip flexion

■Joins with the iliacus to form the iliopsoas which is one of the strongest hip flexors

○Lateral flexion of the vertebral column (side-bending)

○Balancing the trunk

Flexing the trunk when sitting

Innervation: anterior branches of L1-L3

Quadratus lumborum:

Action:

○Lateral flexion of the trunk

○Extension of the lumbar spine

■When both sides contract

○Stabilization of the 12th rib during inspiration

■Provides a stable attachment point for the diaphragm

●Innervation:

○spinal nerves T12-L4

Identify the thoracolumbar fascia:

●Strong connective tissue

●Provides stability to the posterior abdominal wall

●Serves as an attachment sites

●Layers

○Posterior layer

○Middle Layer

○Anterior Layer

Identify the location and innervations of the posterior abdominal nerves