Neurology Anatomy

Question 1

Which nerve supplies the deltoid?

Answer 1

Axillary Nerve (Root C5)

Question 2

Which nerve supplies the biceps?

Answer 2

Musculocutaneous Nerve (C5 & C6)

Question 3

What nerve supplies the finger extensors?

Answer 3

Radial Nerve (Root C7)

Question 4

What nerve supplies the first dorsal interosseous?

Answer 4

Ulnar Nerve

Question 5

What is the innervation of the flexor pollicis longus muscle?

Answer 5

Medial Nerve

Roots C8, T1

Question 6

How do you differentiate an ulnar nerve problem versus a C8/T1 root pathology?

Answer 6

Normal strength in the following movements suggests a ulnar nerve problem, rather than a nerve root problem:

Index Finger Extension (Radial Nerve, supplies by C8)
Thumb Flexion & Abduction (Median Nerve, supplied by C8/T1)

Question 7

Which nerve innervate the gastrocnemius to cause ankle plantar flexion?

Answer 7

Tibial Nerve

Question 8

Which nerve innervates the tibialis anterior?

Answer 8

Peroneal

Question 9

What movement is the tibialis anterior responsible for?

Answer 9

Ankle Dorsiflexion

Question 10

How can you differentiate between a peroneal neuropathy and an L5 neuropathy?

Answer 10

If strength is normal in the following movements, it suggests a peroneal lesion, if weak, suggests an L5 lesion:

(1) Ankle Inversion (Tibial Nerve, L5 root)
(2) Hip Abduction (Sup Gluteal Nerve, L5 root)

If sensation is normal in the lateral ankle, suggests an L5 lesion, because the lateral ankle is supplied S1 through the peroneal nerve. Sensation would be reduced in a peroneal neuropathy.

Question 11

Where does the spinal cord end?

Answer 11

At the level of S1/S2

Question 12

What is the total volume of the CSF?

Answer 12

150 cc

Question 13

What are the laboratory contraindications to lumbar puncture?

Answer 13

INR > 1.7

Platelets < 50