Upper Extremity: Common Spinal Cord Segments

Question 1

C4-5

Answer 1

Levator scapulae - dorsal scapular nerve (sensory: direct branches of C3-4)

Rhomboids - dorsal scapular nerve (sensory: direct branches of C3-4)

Question 2

C5-6

Answer 2

Subclavius - subclavian nerve

Deltoid - axillary nerve

Infraspinatus - subscapular nerve

Teres minor - axillary nerve

Subscapularis - upper and lower subscapular nerves

Teres major - lower subscapular nerve

Question 3

C6-8

Answer 3

Latissimus dorsi - thoracodorsal nerve

Question 4

C5-T1

Answer 4

Pectoralis minor - medial and lateral pectoral nerves

Pectoralis major clavicular head (C5-C6) - medial and lateral pectoral nerves

Pectoralis major sternocostal head (C7-T1) - medial and lateral pectoral nerves

Question 5

C5-7

Answer 5

Serratus anterior - long thoracic nerve

Question 6

Accessory nerve (CN XI)

Answer 6

Trapezius - accessory nerve (CN XI) and C3-4 sensory

Question 7

Sensory: direct branches of C3-4

Answer 7

Levator scapulae - dorsal scapular nerve (sensory: direct branches of C3-4)

Rhomboids - dorsal scapular nerve (sensory: direct branches of C3-4)

Trapezius - accessory nerve (CN XI; motor) and C3-4 (sensory)