ANAT Introduction to the Axilla

Question 1

Muscles of the Rotator Cuff

Answer 1

• Subscapularis
• Supraspinatus
• Infraspinatus
• Teres minor

Question 2

Which rotator cuff muscle is essential for initiation of shoulder abduction?

Answer 2

Supraspinatus (completes first 15o of abduction, then deltoid & trapezius engaged).

Question 3

Innervation of subscapularis.

Answer 3

Upper and lower subscapular nerves
C5, C6, C7

Question 4

Innervation of supraspinatus

Answer 4

Suprascapular nerves
C5, C6

Question 5

Innervation of infraspinatus

Answer 5

Suprascapular nerves
C5, C6

Question 6

Innervation of T Minor

Answer 6

Axillary nerve
C5, C6

Question 7

Innervation of L. Dorsi

Answer 7

Thoracodorsal nerve (C6, C7, C8)

Question 8

Innervation of Biceps Brachii

Answer 8

Musculocutaneous nerve (C5, C6)

Question 9

Innervation of Coracobrachialis

Answer 9

Musculocutaneous nerve (C5, C6, C7)

Question 10

Innervation of Serratus Anterior

Answer 10

Long thoracic nerve (C5, C6, C7)

Question 11

Innervation of Pectoralis Major

Answer 11

Medial & lateral pectoral nerves

Question 12

Innervation of Pectoralis Minor

Answer 12

Medial pectoral nerve

Question 13

Innervation of Teres Major

Answer 13

Inferior subscapular nerve (C5, C6, C7)

Question 14

Innervation of Latissimus Dorsi

Answer 14

Thoracodorsal nerve (C6, C7, C8)

Question 15

Innervation of Deltoid

Answer 15

Axillary nerve (C5, C6)

Question 16

Innervation of Trapezius

Answer 16

Accessory nerve

Question 17

Infraspinatus function.

Answer 17

External rotation & extension.

Question 18

Teres minor function.

Answer 18

External rotation, adduction & extension.

Question 19

Subscapularis function.

Answer 19

Internal rotation & adduction.

Question 20

Trapezius function.

Answer 20

Abduction.

Question 21

Innervation of brachioradialis.

Answer 21

Radial nerve.