Dermatomes

Where can axial line(s) be found?

• Head

• Neck

• Trunk close to upper limb

• The back of the lower limb

• Scrotal or labial region

Dermatome is useful in diagnosing...

• peripheral nerve lsion

• spinal lesion

• muscle paralysis

How many dorsal roots have to be blocked to produce complete anesthesia in a dermatome of the abdomen?

• 5

• 6

• 7

• 3

• 4

Lesion in the mandibular teeth may cause pain in maxillary teeth. Which of the following is the most likely correct explanation?

• They are innervated by the same spinal segment.

• They are supplied by the same peripheral nerve.

• The innervation muscle controlling the 2 teeth are affected.

• This is an example of referred pain.

• Sensory fibres of trigeminal nerve is affected.

Which of the following about dermatome is incorrect?

• A spinal nerve is mixed with both sensory and motor function.

• Root filaments of each pair of left and right spinal nerves delineate a spinal segment.

• Location of dermatome in trunk follows the same sequence as the spinal nerve.

• Dermatomes refers to all the innervation of the skin by a spinal nerve or a spinal segment

• Dermatome maps match sensory loss on skin with affected spinal segment or spinal nerve.