Shoulder girdle

Question 1

Trapezius

• Innervation
• Actions

Answer 1

• Accessory nerve
• Elevates, retracts and pulls inferiorly (scapula)
• rotates scapula during abduction of the arm

Question 2

Latissimus dorsi

• Innervation
• Actions

Answer 2

• Thoracodorsal nerve

- Extends, adducts and medially rotates upper limb

Question 3

Levator scapulae

• Innervation
• Actions

Answer 3

• Cervical nerve (C3,4) and dorsal scapular nerve (C5)

- Elevates scapula

Question 4

Rhomboid major

• Innervation
• Actions

Answer 4

• Dorsal scapula nerve

- Retracts and rotates scapula

Question 5

Rhomboid minor

• Innervation
• Actions

Answer 5

• Dorsal scapula nerve

- Retracts and rotates scapula

Question 6

Deltoid

• Innervation
• Actions

Answer 6

• Axillary nerve
• Anterior fibres (flexion and medial rotation), posterior fibres (extension and lateral rotation), middle fibres (major abductor of the arm)

Question 7

Teres major

• Innervation
• Actions

Answer 7

• lower subscapular nerve

- adducts the shoulder and medially rotates the arm

Question 8

Supraspinatus

• Innervation
• Actions

Answer 8

• suprasacapular nerve (C5,6)

- abducts the arm 0-15 degrees and assists deltoid

Question 9

Infraspinatus

• Innervation
• Actions

Answer 9

• suprascapular nerve

- laterally rotates arm

Question 10

Subscapularis

• Innervation
• Actions

Answer 10

• upper and lower subscapular nerves

- medially rotates the arm

Question 11

Teres minor

• Innervation
• Actions

Answer 11

• axillary nerve

- laterally rotates the arm

Question 12

Serratus anterior

• Innervation
• Actions

Answer 12

• long thoracic nerve

- pulls the scapula forward and around the thorax

Question 13

Which nerves/muscles are damaged in winged scapula

Answer 13

most common - long thoracic nerve (serratus anterior)
fairly common - accessory nerve (trapezius muscle)
rare - dorsal scapula nerve (rhomboid major)