Neuro

Question 1

Spinal accessory nerve

Answer 1

CN XI

Splits into 2 roots immediately:

• Cranial root (from medulla, joins vagus n.)
• Spinal root (from upper spinal cord segments C1-5; innervates trap/SCM)

exits vis jugular foramen

purely motor nerve

Question 2

Long thoracic nerve

Answer 2

innervates serratus anterior
pure motor

Damage: winging of scapula, shoulder pain, inability to raise arm above shoulder level

Question 3

Thoracodorsal nerve

Answer 3

Innervates latissimus dorsi

Damage: weakened pull-ups, inability to adduct, extend, or internally rotation arm

Question 4

Intercostobrachial nerve

Answer 4

innervates skin to upper inner arm

damage: numbness and pain to upper inner arm

Question 5

Sural nerve

Answer 5

sensory nerve
supplies posterolateral distal 1/3 of leg, lateral surface of foot/heel/ankle
Courses along short saphenous vein in distal calf

Question 6

Saphenous nerve

Answer 6

sensory nerve
supplies medial surface of leg/foot/ankle
courses close to great saphenous veins in calf

Question 7

Peroneal nerve

Answer 7

Sensory & motor
Sensation to dorsum of foot
Motor - dorsiflexion

Question 8

Posterior tibial nerve

Answer 8

Sensory & motor
Sensation: sole of foot
Motor: plantar flexion, foot inversion, toe flexion
twists around short saphenous vein near saphenopopliteal junction

Question 9

lateral plantar nerve

Answer 9

sensory: lateral foot
motor: small muscles of foot