Muscles Of Thorax - Front

Question 1

External intercostal

Answer 1

A: Elevate ribs for inspiration

Question 2

Internal intercostal

Answer 2

A: Depress ribs for forced expiration.

Question 3

Pectoralis major

Answer 3

O: sternum, clavicle, and costal cartilages
I: Greater tubercle of humerus
A: flexes, adducts, and medially rotates arm

Question 4

Pectoralis minor

Answer 4

O: ribs 3-5
I: coracoid process of scapula
A: draws scapula anterior and inferior

Question 5

External oblique

Answer 5

O: lower 8 ribs
I: iliac & pubic crest, linea alba
A: rotates & flexes trunk

Question 6

Internal oblique

Answer 6

O: lumbar fascia, iliac crest, inguinal ligament
I: lowest 4 ribs, pubic crest, linea alba
A: Flexes and rotates trunk

Question 7

Rectus abdominis

Answer 7

O: pubic crest and pubic symphysis
I: costal cartilages of ribs 5-7, xiphoid process
A: rotates and flexes trunk

Question 8

Transverse abdominis

Answer 8

O: lowest 6 ribs, iliac crest
I: pubic crest, linea alba
A: compresses abdomen

Question 9

Diaphragm

Answer 9

O: cartilages of lowest ribs, lumbar vertebrae
I: central tendon
A: prime mover of inspiration
IN: phrenic nerve

Question 10

Serratus anterior

Answer 10

O: ribs 1-8
I: medial border of scapula
A: protracted scapula superiorly & laterally