Muscles of Abdominal Girdle

Question 1

External oblique

Answer 1

O - Sternum, external surfaces and inferior border of lower eight ribs (5-12)
I - Pubis, line alba via an aponeurosis and the iliac crest
A - Bilaterally: compresses the abdomen and flexes the spine. Unilaterally: laterally flexes the trunk to same side; rotate trunk to opposite side

Question 2

Rectus abdominus

Answer 2

O - Crest of the pubis and pubic tubercle; front of pubis symphysis
I - Pubis, cartilages of 5th, 6th, 7th ribs; xiphoid process
A - Flexes vertebral column. Tenses abdominal wall. Compresses abdominal viscera

Question 3

Internal oblique

Answer 3

O - From iliac crest
I- Inferior border of ribs 10-12
A - Bilaterally: compresses the abdominal viscera; flexes the spine. Unilaterally: laterally flexes and rotates spine to same side

Question 4

Transverse oblique

Answer 4

O - From the lower ribs and iliac crest
I - Pubis
A - Compresses abdominal contents