Somatosensory Neurophysiology Active learning session

What is the most prevalent type of somatosensory dysfunction that men and women over 70 suffer from?

• Visual Impairment

• Hearing Impairment

• Balance Impairment

• Loss of feeling in the feet

What type of neuropathy does patient C.T. demonstrate?

• mononeuropathy

• autonomic neuropathy

• peripheral neuropathy

• Radiculoplexus neuropathy

Sensory neuropathy is often classified as "small fiber" or "large fiber" neuropathy. Based on patient CT's normal pain/temperature sensations, but impaired vibratory sensation, which fibers are most likely damaged?

• Small fiber neuropathy

• Large fiber neuropathy

• Both large and small fiber neuropathy

• Don't know.

Compared with a non-neuropathy patient, you would expect patient C.T.'s grating orientation discrimination THRESHOLD to be

• Increased

• Decreased

• Stay the same

• What is the grating orientation task?

Diabetic neuropathy most commonly occurs via demyelination of the compound axons. Which result would you expect from the nerve conduction test compared with a non-neuropathy patient?

• Faster conduction velocity (CV)

• Decreased amplitude of action potential

• Slower conduction velocity (CV)

• Increased amplitude of action potential

Patient CT has suffered a laceration on his heel. What change in the neurogenic inflammatory response would you expect compared with a non-diabetic patient?

• Increased antidromic reflex

• Increased CGRP-induced vasodilation

• Increased SP-induced plasma extravasation

• Impaired antidromic reflex

What is a likely cause of the superior spatial acuity in the fingertip of a blind patient?

• Increased (larger) receptive field size.

• lesion of the visual cortex

• expanded area of cortical representation of the fingertip.

• Slower conduction velocity of A-beta fibers innervating the fingers.

In this 5 year old patient, a clear ear canal and a normal-appearing and functioning tympanic membrane suggests the type of hearing loss is likely

• Conductive

• Sensorineural

• Mixed hearing loss

• presbycusis