Pectoral Region

Question 1

What is the function of pectoralis major? Give the innervation

Answer 1

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

Lateral and medial pectoral nerves.

Question 2

What is the function of pectoralis minor? Give the innervation

Answer 2

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

Innervation: Medial pectoral nerve.

Question 3

What is the function of serratus anterior? Give the innervation

Answer 3

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

Innervation: Long thoracic nerve.