Abdominal Wall Muscles

Question 1

External abdominal oblique OINA

Answer 1

Origin is the external surface of the fifth to 12th ribs and inserts on the linea alba the pubic Crest the iliac crest and the pubic symphysis. Innervated by the inferior 5 thoracic nerves, the subcostal nerve and the iliohypogastric nerve. It flexes and rotates the trunk and laterally rotates the trunk and compresses the abdominal contents.

Question 2

Internal oblique

Answer 2

–O – Thoracolumbar fascia, anterior iliac crest, lateral half of inguinal ligament
–I – linea alba, pubic crest, ribs 10-12 inferior surface
–N – lower 5 thoracic nerves, subcostal, iliohypogastric nerves
–A – flex and rotate the trunk, laterally rotate the trunk, compress abdominal contents

Question 3

Transversus Abdominis

Answer 3

0 – thoracolumbar fascia, iliac crest, lateral one third of the inguinal ligament, internal surface of costal cartilage’s 7 to 12
–I – linea alba, pubic crest, pubic symphysis
–N – lower 5 thoracic nerves, subcostal, iliohypogastric nerves
–A – compress and support abdominal viscera, increase intra-abdominal pressure

Question 4

Rectus Abdominis

Answer 4

–0 – pubic symphysis, pubic crest
–I – xiphoid process, 5th and 7th costal cartilage’s
–N – lower 5 thoracic nerves, subcostal, iliohypogastric nerves
–A – flexes trunk and tenses anterior abdominal wall

Question 5

Psoas Major

Answer 5

–0 - transverse processes, bodies and intervertebral discs of T12-L5
–I - lesser trochanter of femur with iliacus
–N - ventral primary rami of L2-L4
–A – prime hip flexion of the thigh, lateral flexion of the trunk and flexion of the trunk

Question 6

Psoas Minor

Answer 6

–0 - bodies of vertebrae T12 and L 1 and the disc in-between
–I - pubic bone
–N - ventral primary ramus L1
–A - flexion of the pelvis and vertebral column

Question 7

Iliacus

Answer 7

–0 - iliac fossa
–I - lesser trochanter with psoas major
–N - femoral nerve
–A - flexion of the thigh

Question 8

Quadratus lumborum (huge effect on back pain

Answer 8

–0 - iliac crest, iliolumbar ligament, and transverse processes of lower Lumbar vertebrae
–I - rib 12, transverse process of upper Lumbar vertebrae
–N - subcostal and upper lumbar ventral primary rami
–A - flexion of the trunk laterally, extend vertebral column, elevate the hip, stabilize 12 rib against inspiration