Exercise 19 review sheet

thoracic nerve pairs

12

lumbar nerve pairs

5

cervical nerve pairs

8

Wrist drop results in an inability to extend the hand at the wrist. Which nerve would most likely be affected in this injury?

Radial nerve

After a person recovers from the chickenpox, the virus can lie dormant in the dorsal root ganglion in multiple levels of the spinal cord and cranial nerves. Later in life, the virus can be reactivated and cause shingles. Why is a reactivated varicella-zoster virus (VZV) infection so painful?

When the virus is reactivated, it travels within a sensory neuron to the skin.

fiber type in spinal nerve

both sensory and motor

collection of spinal nerves traveling in the vertebral canal below the terminus of the spinal cord

cauda equina

The spinal cord is enlarged in two regions. Select the two regions.

cervical and lumbar

spinal cord terminus

conus medullaris

meningeal extension beyond the spinal cord terminus

filum terminale

most superior boundary of the spinal cord

formanen magnum

primary neuron type found in dorsal horn

interneurons Submit

fiber type in ventral root

motor

primary neuron type found in ventral horn

motor

fiber type in dorsal root

sensory

neuron type in dorsal root ganglion

sensory

What is the significance of these enlargements?

they are enlarged to supply the limbs