Upper Limb - Pec Region

Question 1

What is the innervation of the pec major muscle?

Answer 1

Medial and lateral pectoral nerves

Question 2

What action does the clavicular head of pectoralis major perform on the shoulder?

Answer 2

Flexion

Question 3

Where is pectoralis minor located in comparison to pectoralis major?

Answer 3

Posterior

Question 4

Where on the scapula does pectoralis minor attach?

Answer 4

Coracoid process

Question 5

Which wall of the axillary does the serratus anterior form?

Answer 5

Medial

Question 6

What is the main action of serratus anterior?

Answer 6

Rotating the scapula - allows the arm to be raised over 90 degrees

Question 7

Injury to which nerve can cause winging of the scapula?

Answer 7

Long thoracic nerve

Question 8

The sternocostal head of pec major originates from the aponeuorsis of which muscle?

Answer 8

External oblique

Question 9

Which muscles form the pectoral region?

Answer 9

Pec major, pec minor, serratus anterior and subclavius

Question 10

What happens if the long thoracic nerve is damaged?

Answer 10

Serratus anterior is paralysed, scapular no longer held against rib cage and protrudes out of back. This has a ‘winged’ appearance