Dermatomes & Myotomes

Question 1

What is a Dermatone?

Answer 1

refers to the skin area supplied by one dorsal root

Question 2

what does the dorsal or posterior rami innervate?

Answer 2

intercostal muscles the muscles and skin in the extremities & anterior & lateral trunk

Question 3

Why is examining sensory integration important?

Answer 3

See how well the CNS and it’s ability to process and integrate information is functioning

Question 4

Does a peripheral nerve injury present with sensory impairments that parallel it’s distribution?

Answer 4

Yes, injury to the nerve will most likely correspond to it’s pattern of innervation.

Question 5

Myotome

Answer 5

group of muscles innervated by a spinal nerve

Question 6

If the spinal nerve is injured could there be damage to the reflexes?

Answer 6

Yes, depending if the spinal nerve has a reflex

Question 7

Does injury to spinal nerve C1 show signs of decreased reflexes?

Answer 7

no

Question 8

What muscles maybe weak if C2 spinal nerve is pinched?

Answer 8

Longus Colli, SCM, rectus capitis

Question 9

If the patient presents with paresthesias of the cheek and side of the neck, which spinal nerve is injuried?

Answer 9

C3

Question 10

What spinal nerve innervates dermatone affecting the temle, forehad and occiput?

Answer 10

C2

Question 11

What muscle weakness might a patient have if the C4 spinal nerve was injured?

Answer 11

weakness in trapezius, levator scapulae

Question 12

What nerve root is affected if the reflexes of biceps & brachioradialis are decreased and their is paresthesia thumb and index finger?

Answer 12

C6

Question 13

What pattern of muscle weakness would C5 demonstrate?

Answer 13

deltoid area, anterior aspect of entire arm to base of thumb

Question 14

Patient complains of prickling pain along the lateral posterior arm, what nerve root could be injured with this type of dermatome pain?

Answer 14

C7

Question 15

Patient complains of weakness in extensor carpi ulnaris and flexor carpi ulnaris, what spinal nerve could be injured?

Answer 15

C8

Question 16

Patient complains of pain on medial side of forearm to base of little finger, what spinal nerve maybe injured?

Answer 16

T1

Question 17

L1 nerve root injury would cause what type of dermatome covering what area of the body?

Answer 17

Back over trochanter and groin

Question 18

Patient complains of pain over the front of the tibia (shin). What spinal nerve could be injured?

Answer 18

L4

Question 19

Patient complains of weakness in muscles that straighten the knee, after further testing paresthesia is affecting the medial knee. What nerve root is causing this?

Answer 19

L3

Question 20

Patient demonstrates absent or weak knee jerk reflex, what muscles would demonstrate weakness? And what nerve root could be affected?

Answer 20

Quadriceps, and nerve root L4

Question 21

You treat a patient complaining of stinging pain in the posterior/lateral thigh, lateral spect of the leg and dorsum of the foot. After further review you also notice muscle weakness in the gluteus medius and dorsiflexors. What nerve root could be to blame?

Answer 21

L5

Question 22

A patient with S4 injury would complain of paresthesia to what area of the body?

Answer 22

saddle area, genitals, anus

Question 23

patient with muscle weakness in the bladder and rectus could be suffering from a root injury to what nerve?

Answer 23

S4

Question 24

If the achilles reflex is weak or absent what nerve root is to blame?

Answer 24

S1

Question 25

What two nerve roots have similar my tome and reflexes that are affected?

Answer 25

S1, S2

Question 26

Patient complains of pain in groin, posteromedial thigh to knee but doesn’t exhibit muscle weakness or paresthesia, what nerve root could cause this?

Answer 26

S3