CC7: Major plexuses and Peripheral Nerves

Question 1

provides major sensory and motor innervation for the upper extremities

Answer 1

Brachial plexus

Question 2

provides major sensory and motor innervation to the lower extremities and pelvis

Answer 2

lumbar plexus

Question 3

Erb-Duchenne palsy (“waiter’s tip”)

Answer 3

C5-C6 plexopathy-

Question 4

Weakness of shoulder abduction (deltoid) , elbow flexion (biceps) , arm supination (infraspinatus) and wrist extension

Answer 4

Erb Duchenne

Question 5

Common in accidents and newborns when head is pushed away from the shoulder

Answer 5

Upper Trunk Plexopathy

Question 6

Klumpke’s Palsy

Answer 6

C8-T1 plexopathy

Question 7

– Severe hand weakness, atrophy (wasting)of muscles, claw hand (weakness of all lumbricals)
– Numbness and abnormal sensations (paresthesias) of medial aspect of hand and forearm

Answer 7

Klumpke’s palsy

Question 8

Smallpupil(miosis),droppedeyelid(ptosis), decreased facial perspiration (anhidrosis)

Answer 8

T1 nerve is damaged before giving fibers to sympathetic system(horners)

Question 9

Horner’s syndrome

Answer 9

ptosis, miosis, anhydrosis

Question 10

Lower Trunk Plexopathy

Answer 10

Usually occurs when the arm and shoulder are pulled up (upward traction) such as when grabbing a branch during a fall from a tree

Question 11

Lower brachial plexus is compressed between the clavicle and the first rib

Answer 11

neurogenic Thoracic Outlet Syndrome

Question 12

Initially, lower brachial plexus injury by an apical lung tumor

Answer 12

Pancoast’s Syndrome

Question 13

Acute onset shoulder and arm pain (usually intense, burning) followed by sensory loss and weakness of muscles innervated by brachial plexus- inflammatory

Answer 13

Idiopathic Brachial Plexitis- Parsonage-Turner Syndrome

Question 14

Burning, lancinating pain on hips and anterior thigh , followed by weakness and wasting of thigh muscles, causing buckling of knee due to quadriceps weakness

Answer 14

Diabetic Lumbosacral Plexopathy

Question 15

develops pain and tingling in his right thumb, index and middle fingers that is worse at night.

Answer 15

Median Nerve

Question 16

Entrapment syndrome by compression of median nerve as passes under flexor retinaculum on flexor surface of wrist- carpal tunnel

Answer 16

carpal tunnel syndrome

Question 17

slipped on wet floor and twisted right foot toward the left, causing pain and weakness.

Answer 17

Common Peroneal (Fibular) Nerve Palsy

Question 18

weakness and numbness and tingling in left leg, over anterior thigh down to medial calf above foot.

Answer 18

Femoral Neuropathy

Question 19

Lateral femoral cutaneous nerve entrapped as passes under inguinal ligament and fascia lata

Answer 19

Meralgia Paresthetica

Question 20

Associated to trauma as passes in cubital tunnel of elbow, entrapment due to degenerative disease, habit of resting elbows on hard table

Answer 20

Ulnar Neuropathy

Question 21

Weakness of all foot and ankle muscles and of knee flexion, loss of Achilles tendon reflex

Answer 21

Sciatic neuropathy

Question 22

Weakness of extensors of arm, hand and fingers, sensory loss in radial nerve distribution, often with wrist drop

Answer 22

Radial neuropathy