Question

CAN YOU PLEASE ANSWER ALL QUESTIONS AND PLEASE ANSWER AS SOON AS POSSIBLE

1. What are dermatomes?

a. Patches of skin innervated by the same dorsal spinal (sensory) roots

b. Patches of skin overlying muscles innervated by the same ventral spinal (motor) roots

c. Patches of skin with different kinds of hair

d. None of the above

2-4. Match the lesion to the result

A. Right optic tract

B. Left optic nerve

C. Right visual cortex

2. Total blindness in left eye

3. Able to see only right visual field in both eyes

4. Blind spots in the left visual field in both eyes

5. The classical ascending sensory pathways for vision, hearing, somesthesia and taste synapse with nuclei located in which region of the brain:

1. Dorsal root ganglion
2. Dorsal-medial thalamus
3. Ventral thalamus
4. Anterior hypothalamus

Answer 1

1-3:

A. right optic tract lesion would result in loss of left visual field, thus able to see only right visual field in both eyes (2)

B: left optic nerve: blind spots in left visual field in both eyes (3)

C: right visual cortex: total blindness in left eye

4:

Dermatome is an area of skin supplied by afferent nerve fibers originating from a single dorsal root of spinal nerve. So option ‘a’.

5:

The classical pathways for vision, hearing, somesthesia and taste lead to ventral thalamus.