Right anterior cerebral artery.

(See figs. 7, 8)

Right middle cerebral artery

(See figs 7, 8)

Amyotrophic lateral sclerosis (Lou Gehrig's Disease)

See fig. 18A

Distal extremities commonly affected first

Peripheral neuropathy

(See question 3-5B)

Tertiary syphilis (tabes dorsalis)

Upper extremities less commonly affected

(See fig 18B)

Hemisection of spinal cord 

(Brown-Sequard Syndrome) on left @ T11

(See fig 15 & question 3-1)

Syringomyelia C5-T2 

(See fig 18F & question 3-3)

Cervical levels are most commonly affected, often with atrophy of the small muscles of the hand

Pernicious anemia. 

Commonly also presents with numbness and tingling of distal portion of all extremities secondary to peripheral nerve involvement.

(See fig 18C)

Guillian-Barre syndrome.

Commonly ascends to upper extremities and face after affecting lower extremities.

(See fig 18E)

Polio

(See fig 18D)

Median nerve compromise. 

When injury is at level of wrist (e.g., carpal tunnel syndrome), wrist flexion is unaffected.

Lesion of left medulla

(See question 5-3B)

Syndrome of the posterior inferior cerebellar artery.

(See question 5-3C).

May also cause contralateral loss of facial pain-temp, if trigeminal lemniscus involved.

(See fig 27)

Lesion fo the right caudal pons

(See question 5-3F)

Multiple sclerosis

(no single lesion possible)

Lesion of right pons

(See question 5-3H)

Lesion of left midbrain

(See question 5-3I)

Lesion of left midbrain

(See question 5-3J)