KINES 262 Anterior Abdominal Muscles

rectus abdominis

rectus abdominis action

*Lumbar/spinal flexion

*Lateral Flexion of spine both sides

*Posterior pelvis rotation

rectus abdominis origin

crest of pubis

rectus abdominis insertion

Cartilage of 5-7 ribs and xiphoid process

rectus abdominis innervation

Intercostal nerves (T7-T12)

External Oblique

External Oblique action

* Lumbar/spinal flflexion

*Lateral flexion of spine both sides

*Contralateral rotation of the spine

External Oblique origin

Borders of lower 8 ribs at side of chest

External Oblique insertion

Apononeroses from linea alba to iliac crest

External Oblique innervation

Intercostal nerves (T5-T12)

internal oblique

internal oblique action

*Lumbar flexion

*Lateral flexion both sides

*Ipsilateral rotation spine

internal oblique origin

Thoracolumbar fascia & iliac crest

internal oblique insertion

Costal cartilage of the 8-10th ribs and linea alba

internal oblique innervation

Intercostal nerves (T5-T12)

transverse abdominis

transverse abdominis action

*Forces expiration

transverse abdominis origin

Inner rim of the iliac crest, and inner surface of the costal cartilages of the lower 6 ribs

transverse abdominis insertion

Crest of pubis, and linea alba

transverse abdominis innervation

Intercostal nerves (T5-T12)

Iliopsoas

Iliopsoas action

*hip flexion

Iliopsoas origin

Iliacus - iliac fossa

Psoas major - tranverse process of T12-L-5

Iliopsoas insertion

Lesser trochanter for both

Iliopsoas innervation

Lumbar Plexus - L2-L5