Pectoral Muscles

Question 1

Innervation of serratus anterior

Answer 1

Long thoracic nerve.

Question 2

Innervation of Pectoral Major

Answer 2

Lateral and medial pectoral nerves.

Question 3

Subclavius innervation

Answer 3

Nerve to subclavius.

Question 4

Function of Pectoral Minor

Answer 4

Stabilises the scapula by drawing it anteroinferiorly against the thoracic wall.

Question 5

Function of serratus anterior

Answer 5

Rotates the scapula, allowing the arm to be raised over 90 degrees. It also holds the scapula against the ribcage.

Clinical correlation is winged scapula

Question 6

Innervation of Pectoral Minor

Answer 6

Medial pectoral nerve.

Question 7

Function of subclavius

Answer 7

Anchors and depresses the clavicle

Question 8

Function of Pectoral Major

Answer 8

Adducts and medially rotates the upper limb and draws the scapula anteroinferiorly. The clavicular head also acts individually to flex the upper limb.