Dermatomes

Question 1

What is a dermatome a combination of?

Answer 1

RECEPTIVE FIELD OF THE SENSORY AXONS
+
ORIGINATING FROM A SINGLE NERVE

Question 2

How are dermatomes named?

Answer 2

BASED ON SPINAL NERVE WHICH SUPPLIES THEM

Question 3

Do dermatomes have distinct borders or considerable overlap?

Answer 3

CONSIDERABLE OVERLAP

Question 4

With loss of afferent nerve function by one spinal nerve, are sensations from the dermatome it supplies completely lost? Why?

Answer 4

NO
BECAUSE OF OVERLAP FROM ADJACENT SPINAL NERVES
(REDUCTION IN SENSITIVITY)

Question 5

Which spinal nerve supplies the dermatome at the lateral shoulder and arm?

Answer 5

C5

Question 6

Which spinal nerve supplies the dermatome at the thumb, index finger (radial border of hand)?

Answer 6

C6

Question 7

Which spinal nerve supplies the dermatome at the middle finger?

Answer 7

C7

Question 8

Which spinal nerve supplies the dermatome at the digiti minimi (ulnar border of hand)?

Answer 8

C8

Question 9

Which spinal nerve supplies the dermatome at the medial elbow?

Answer 9

T1

Question 10

Which spinal nerves supply the dermatomes whose intercostal nn. form segmental strips on thorax?

Answer 10

T2 - T12

Question 11

Which spinal nerve supplies the dermatome that goes across the umbilicus?

Answer 11

T10

Question 12

Which spinal nerve supplies the dermatome that goes across the upper edge of the pubic bone? (subcostal nerve)

Answer 12

T12