Week 1 - Pectoral Region

Question 0

What are the actions of pectoralis major?

Answer 0

Medial rotation of humerus
Flexion of humerus
Adduction of humerus

Question 1

What nerve(s) innervate pectoralis major?

Answer 1

Medial and lateral pectoral nerves

Question 2

What nerve innervates pectoralis minor?

Answer 2

Medial pectoral nerve

Question 3

What are the actions of pectoralis minor?

Answer 3

Depresses tip of shoulder

Abducts scapula

Question 4

What nerve innervates serratus anterior?

Answer 4

The long thoracic nerve

Question 5

What are the actions of serratus anterior?

Answer 5

Pulls scapula against ribcage

Abducts scapula

Question 6

What nerve innervates subclavius?

Answer 6

Nerve to subclavius

Question 7

What are the actions of subclavius?

Answer 7

Pulls clavicle medially to stabilise the sternoclavicular joint

Question 8

Explain the pathophysiology of a “winged scapula”

Answer 8

Damage to the long thoracic nerve results in paralysis of serratus anterior. Therefore, scapula no longer pulled against ribcage - appears to “pop” out of back.

Question 9

How do you test for a winged scapula?

Answer 9

Get the patient to face a wall and push against it with outstretched arms.