Muscles of Thorax and Abdomen

Question 1

External intercostal*

Answer 1

A: Elevate ribs
O: Inferior border of superior rib
I: Superior of inferior rib

Question 2

Internal intercostal*

Answer 2

A: Depress ribs
O: Superior border of inferior rib
I: Inferior border of superior rib

Question 3

External oblique*/

Answer 3

A: Flexes vertebral column and compresses abdomen (bilateral); lateral flexion and rotation of vertebral column (unilateral)
O: ribs 5-12
I: linea alba

Question 4

Internal oblique/

Answer 4

A: Flexes vertebral column and compresses abdomen (bilateral); lateral flexion and rotation of vertebral column (unilateral)

Question 5

Pectoralis major*/

Answer 5

A: flexes arm, adducts arm, medial rotation of arm
O: clavicle, ribs, sternum
I: humerus

Question 6

Pectoralis minor*/

Answer 6

A: Protraction/abduction of scapula, depresses scapula
O: ribs
I: coracoid process of scapula

Question 7

Rectus abdominis*/

Answer 7

A: flexes vertebral column, compresses abdominal wall
O: pubis
I: xiphoid process of sternum, ribs 5-7

Question 8

Serratus anterior

Answer 8

A: Protraction of scapula

Question 9

Transverse abdominis/

Answer 9

A: Flexes vertebral column and compresses abdomen (bilateral); lateral flexion and rotation of vertebral column (unilateral)

Question 10

Linea alba/

Answer 10

A: Vertical fibrous strip that connects the left and right rectus sheaths

Question 11

Rectus sheath/

Answer 11

A: Fibrous sleeve that encloses rectus abdominis