Upper Extremity Nerves

Question 1

Cranial:
Root: Spinal Root
Accessory n. (CN XI) [motor]

Answer 1

Function: motor [spinal accessory nucleus of C1-C5] innervation of the trapezius and sternocleidomastoid muscles

Question 2

Brachial Plexus: (from ventral rami of spinal nerves C[4]5- T1)
Root: C5
Dorsal Scapular n. (C4-C5)

Answer 2

Function: postganglionic sympathetic & motor (NOT SENSORY) to levator scapulae and rhomboid muscles

Question 3

Brachial Plexus: (from ventral rami of spinal nerves C[4]5- T1)
Root: C5
Long Thoracic n. (C5-C7)

Answer 3

Function: sensory, and postganglionic sympathetic & motor innervation to serratus anterior muscle

Question 4

Brachial Plexus: (from ventral rami of spinal nerves C[4]5- T1)
Trunk: Upper Trunk (C5-C6)
Suprascapular n. (C4-C6)

Answer 4

Function: sensory, and postganglionic sympathetic & motor innervation of the supraspinatus and infraspinatus muscles

Question 5

Brachial Plexus: (from ventral rami of spinal nerves C[4]5- T1)
Trunk: Upper Trunk (C5-C6)
Subclavian n. (C5-C6)

Answer 5

Function: sensory, and postganglionic sympathetic & motor innervation of the subclavius muscle

Question 6

Brachial Plexus: (from ventral rami of spinal nerves C[4]5- T1)
Cords: Lateral Cord
Lateral Pectoral n. (C5-C7)

Answer 6

Function: sensory, and postganglionic sympathetic & motor innervation of the pectoralis major & minor muscles

Question 7

Brachial Plexus: (from ventral rami of spinal nerves C[4]5- T1)
Cords: Lateral Cord
Musculocutaneous n. (C5-C7) [two branches]

Answer 7

1) Muscular branches
Function: sensory, and postganglionic sympathetic & motor innervation of the biceps brachii, coracobrachialis, and brachialis muscles
2) Lateral cutaneous nerve of the forearm
Function: sensory, and postganglionic sympathetic innervation of the skin overlying the LATERAL ASPECT of the forearm

Question 8

Brachial Plexus: (from ventral rami of spinal nerves C[4]5- T1)
Cords: Lateral Cord
LATERAL ROOT of the Median n. (C5-C7)
[six branches]

Answer 8

FILL IN WHEN REACH FOREARM

Question 9

Brachial Plexus: (from ventral rami of spinal nerves C[4]5- T1)
Cords: Medial Cord
Medial Pectoral n. (C8-T1)

Answer 9

Function: sensory, and postganglionic sympathetic & motor innervation of the pectoralis major and minor muscles

Question 10

Brachial Plexus: (from ventral rami of spinal nerves C[4]5- T1)
Cords: Medial Cord
Medial Cutaneous nerves of the arm and forearm (C8-T1)

Answer 10

Function: sensory and postganglionic sympathetic innervation of the skin overlying the MEDIAL ASPECT of the arm and forearm

Question 11

Brachial Plexus: (from ventral rami of spinal nerves C[4]5- T1)
Cords: Medial Cord
MEDIAL ROOT of the Median n. (C8-T1)
[six branches]

Answer 11

FILL IN LATER

Question 12

Brachial Plexus: (from ventral rami of spinal nerves C[4]5- T1)
Cords: Medial Cord
Ulnar n. (C7-T1)

Answer 12

FILL IN LATER

Question 13

Brachial Plexus: (from ventral rami of spinal nerves C[4]5- T1)
Cords: Posterior Cord
Upper Subscapular n. (C5-C6)

Answer 13

Function: sensory, and postganglionic sympathetic & motor innervation of the subscapularis muscle

Question 14

Brachial Plexus: (from ventral rami of spinal nerves C[4]5- T1)
Cords: Posterior Cord
Thoracodorsal n. (C6-C8)

Answer 14

Function: sensory, and postganglionic sympathetic & motor innervation of the latissimus dorsi muscle

Question 15

Brachial Plexus: (from ventral rami of spinal nerves C[4]5- T1)
Cords: Posterior Cord
Lower Subscapular n. (C5-C6)

Answer 15

Function: sensory, and postganglionic sympathetic & motor innervation of the subscapularis and teres major muscles

Question 16

Brachial Plexus: (from ventral rami of spinal nerves C[4]5- T1)
Cords: Posterior Cord
Axillary n. (C5-C6) [two branches]

Answer 16

1) Muscular branches in the arm
Function: sensory, and postganglionic sympathetic & motor innervation of the deltoid and teres minor muscles
2) Superior lateral cutaneous nerve of the arm
sensory and postganglionic sympathetic innervation of the skin overlying the SUPERIOR LATERAL aspect of the arm

Question 17

Brachial Plexus: (from ventral rami of spinal nerves C[4]5- T1)
Cords: Posterior Cord
Radial n. (C5-T1) [four branches]

Answer 17

FILL IN LATER