MSK Session 1 - Pectoral Region

Question 1

What is the action and nerve supply of Pectoralis Major?

Answer 1

Medial and lateral pectoral nerves (brachial plexus, C6-T1)

Medial rotation, adduction of arm, flexion of arm

Question 2

What is the nerve supply and action of Pectoralis Minor?

Answer 2

Medial and lateral pectoral nerve (same as pec major)

Pulls scapula medially, forwards and inferiorly.

Question 3

What is the nerve supply and action of Serratus Anterior?

Answer 3

Long Thoracic Nerve (winged scapula if damaged)

External rotation and protraction of scapula (boxer’s muscle)

Question 4

Name the three muscles that can be found in the pectoral region.

Answer 4

Pectoralis Major
Pectoralis Minor
Serratus Anterior