Neuro Which Nerve Does What

Question 0

Which spinal nerve level gives innervation to the back and sides of the head?

Answer 0

c2

Question 1

Which nerve gives sensory innervation to the face, and what are the divisions? Where does each division give innervation?

Answer 1

Trigeminal nerve gives sensory innervation to the face.
Ophthalmic division: to the forehead and top of the head
Maxillary division: to the cheeks, nose and upper lip
Mandibular division: to the chin, and a thin strip in front of ears to the temples.

Question 2

Which spinal nerve level gives innervation to the front, sides and back of the neck?

Answer 2

C3

Question 3

Which spinal nerve root gives sensory innervation to the lowest lateral part of the shoulders/tops of the arms?

Answer 3

C5

Question 4

Which spinal nerve root level gives sensory innervation to the thumbs lateral half of index fingers, lateral half of forearms and inferior lateral arm?

Answer 4

C6

Question 5

Which spinal nerve root level gives sensory innervation to the medial forearm?

Answer 5

T1

Question 6

Which spinal nerve root level gives sensory innervation to the middle finger, half the index and half the ring finger?

Answer 6

C7

Question 7

Which spinal nerve root level gives sensory innervation to the little finger and half of the ring finger?

Answer 7

C8

Question 8

Which sensory nerve root gives sensory innervation to the nipple line?

Answer 8

T4

Question 9

Which spinal nerve root level gives sensory innervation to the area just under the nipple line?

Answer 9

T5

Question 10

How do you determine of locations the thoracic spinal root dermatomes on the chest wall by using body landmarks?

Answer 10

The thoracic dermatomes appear as bands across the chest wall. T7 is the level of the xyphoid process, T10 is at the level of the umbilicus (belly button), then L1 is at the inguinal ligament, so you can count down to T12 above the inguinal ligament.
The higher thoracic dermatomes across the chest are fairly horizontal, but the lower ones angle inferiorly, t12 is at about 45degrees to the midline.

Question 11

Describe the course of dermatome L5

Answer 11

It’s is a strip running from a high region of the buttocks posteriorly, down the most lateral part of the thigh, curving to run as a strip down the most anterior part of the lower leg and then over the superior part of the foot, including toes 2, 3 and 4. It also wraps under to give sensation to the central part of the base of the foot.

Question 12

Describe the course of dermatome L4

Answer 12

It’s a strip running from a high region of the buttocks posteriorly, curving round the lateral thigh to pass over the kneecap anteriorly. It then continues down while crossing over to the medial aspect of the lower leg. It innervates the medial anterior foot and the big toe.

Question 13

What do S2 S3 and S4 give sensory innervation to?

Answer 13

The penis and area around the anus, they also control erection.
(s2,3,4 keep the penis of the floor)

Question 14

What is the spinal root level for the Biceps reflex?

Answer 14

C5, C6

Question 15

What is the spinal root level for the Brachioradialis reflex?

Answer 15

C6

Question 16

What is the spinal root level for the Triceps reflex?

Answer 16

C7

Question 17

What is the spinal root level for the Knee jerk reflex?

Answer 17

L4 and L3

Question 18

What is the spinal root level for the Achilles Tendon reflex?

Answer 18

S1

Question 19

Describe the course of dermatome s1

Answer 19

S1 travels as a strip up the backs of the legs. The lateral half of the sole of the foot is s1, as is most of the heel. Then there is a strip up the backs of the legs - the lateral half of it is s1 and the medial half is s2. S1 carries on up to arch over the top of the buttocks.

Question 20

Describe the course of dermatome s2

Answer 20

S2 is a strip that rises up the backs of the legs. It starts just above and posterior to the medial malleolus, then travels up the legs: the medial half of the most posterior part of the legs. S2 then carries on up to form an arch on the buttocks, under the arch of s1.

Question 21

What is the dermatome of the skin of the penis?

Answer 21

S3

Question 22

What is the dermatome of the skin of the scrotum?

Answer 22

S4

Question 23

Which spinal root innervates the skin of the shoulders, the very top of the chest inc over the clavicles, and the very top of the back?

Answer 23

C4