Answer
External abdominal oblique
This is a superficial muscle located in the wall of the abdomen.
Action: It supports abdominal viscera; stabilizes the vertebral column and maintains posture . It also compresses the abdominal viscera, and aids in deep breathing. loud vocalization, and vomiting. It also has roes in expulsion of pelvic contents-- urination, defecation, and childbirth.
Origin: ribs 5-12
Insertion : Anterior half of the iliac crest. the symphysis and superior margins of the pubis.
This muscle is innervated by spinal nerves T7-T12
Internal abdominal oblique. This muscle is located deep in the abdominal wall. It supports abdominal viscera; helps to maintain posture; aids in speech and breathing, and has roles in defecation, urination, vomiting and childbirth
The origin of this muscle includes the inguinal ligament, the iliac crest and thoracolumbar fascia. Insertion is on ribs 10-12, costal cartilages of 7-10 and the pubis.
Innervation is supplied from the anterior rami of spinal nerves T7-L1.
Work Step by Step
Transverse abdominal muscle:
Location is in the wall of the abdomen-- anterior and lateral aspects.This muscle acts to compress the contents of the abdomen. It also has a role in maintaining pelvic stability, and aids in labor (child birth). Origin is composed of inguinal ligament, iliac crest and thoracolumbar fascia. Insertion is on ribs 10-12, costal cartilages 7-10, and on the pubis. Innervation is supplied by anterior rami of spinal nerves T7-L1.
Rectus abdominis muscle
This muscle extends from the sternum to the pubis--in the anterior abdominal wall. It acts to flex the waist in bending forward. It functions in doing sit-ups; and it stabilizes the pelvic region during walking. It also helps to compress abdominal viscera.
Its origin is on the pubic symphysis and the superior margins of the pubis. Insertion is on the xiphoid process of the sternum and on costal cartilages 5-7. Innervation is from the anterior rami of spinal nerves T6-T12
