Post Lab 2

There are ________ enlargements of the spinal cord.

2

How many pairs of spinal nerves are present in humans?

31

The ventral rami of spinal nerves ________ form the major nerve plexuses.

C1 through T1 and L1 through S4

At the level of the first or second lumbar vertebra the spinal cord terminates in a structure called the ________.

Conus Medullaris

The meninges that cover the spinal cord from outermost to innermost are ________.

Dura Mater, Arachnoid Mater, Pia Mater

This cranial nerve operates the muscles of the tongue.

Hypoglossal

These horns of the spinal cord are present only in the thoracic and lumbar regions.

Lateral

Nerves serving the lower limb issue from this enlargement of the spinal cord.

Lumbar

Ventral roots of spinal nerves are purely or primarily ________.

Motor

Which of the cranial nerves below is purely sensory? accessory olfactory glossopharyngeal trochlear

Olfactory

This purely sensory cranial nerve carries signals associated with vision.

Optic

What functional type of neuron is found in the dorsal root ganglion?

Sensory

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 neuron is reactivated, it travel in the sensory neuron to the skin

In addition to its role in spinal reflex activity, the spinal cord also ________.

contains sensory and motor tracts traveling to and from higher nervous centers

These fiber tracts carry signals about voluntary movement to the spinal cord.

corticospinal tracts

These fiber tracts run between the dorsal horns.

dorsal white columns

Somatosensory functions are carried out in this part of the spinal cord.

dorsal white columns and dorsal horns

The spinal nerves are ________ nerves.

mixed

The dorsal rami of spinal nerves ________.

serve the skin and muscles of the posterior body trunk

What true about cranial nerves III, IV, and VI?

They move the eyeball

The odd tingling sensation that you experiences when you hit the funny bone is due to trauma to the ________ nerve.

Ulnar