Function of external oblique muscle:
External oblique: Most superficial muscle which originates from the outer pa of the 5th to 12th ribs on each side of the rib cage. This muscle then runs diagonally down each side and connects to the iliac crest, linea alba, and the pubis. Function: External oblique contributes to the maintenance of abdominal tone, increasing intra-abdominal pressure (as in active expiration), and lateral flexion of the trunk against resistance. Bilateral contraction flexes the trunk forward and aid in movement of spine and back. Contraction of external oblique muscle approximates the two crura (medial and lateral) of superficial inguinal ring like a slit valve to maintain the integrity of inguinal canal.
Anterior flexion of veebral column
Active expiration
Closure of inguinal ring
All of the above
Abdominal wall ,Inguinal and Femoral region