Quiz 3

The part of the peripheral nervous system that carries sensory information to the CNS is designated

afferent

Bladder fullness is to ________ as blood pH is to ________.

baroreceptors; chemoreceptors

Within each hemisphere, deep to the floor of the lateral ventricle, you will find the

basal nuclei.

In a(n) ________ synapse, current flows directly between cells.

electrical

As you ascend from the medulla oblongata to the cerebrum, the functions of each successive level become

more complex.

The ________ nervous system carries impulses to skeletal muscles.

somatic

The heart muscle is a ________ effector.

visceral

Regions of the CNS with an abundance of myelinated axons constitute the ________ matter.

white

We are constantly bombarded by a variety of stimuli inside and outside of our bodies. Why are we not overwhelmed by sensory information?

A very tiny percentage of incoming sensory information is received by the cerebral cortex.

Clusters of RER and free ribosomes in neurons are called

Nissl bodies.

________ monitor the position of skeletal muscles and joints

Proprioceptors

________ neurons form the afferent division of the PNS.

Sensory

Why is it that one cannot identify the location of internal organs, although joints and bone location can be identified?

The internal organs have no proprioceptors like joints, bones, and muscles.

Deteriorating changes in the distal segment of an axon as a result of a break between it and the soma is called ________ degeneration.

Wallerian

The ________ nervous system is composed of the brain and spinal cord.

central

The ________ reflex complements the flexor reflex by activating contralateral muscles.

crossed extensor

The thalamus is often called the "air traffic controller" of the brain because it

determines the routing of incoming sensory information to the correct cerebral cortex area.

Specialized ________ cells form the secretory component of the choroid plexus.

ependymal

________ line the brain ventricles and spinal canal.

ependymal cells

The dural fold that projects into the longitudinal fissure between cerebral hemispheres is called the

falx cerebri

Damage to ependymal cells would most likely affect the

formation of cerebrospinal fluid.

The reflex movement of the head toward a loud noise is directed by the mesencephalon. Which nuclei accomplish this?

inferior colliculi

A very large, fast-adapting tactile receptor that is composed of a single dendrite enclosed by concentric layers of collagen is a

lamellated (Pacinian) corpuscle.

Divisions of the cerebral hemispheres that are named after the overlying skull bones are

lobes

Extensive damage to oligodendrocytes in the CNS could result in

loss of sensation and motor control

Which of the following is not a function of the neuroglia?

memory

The cerebellum and pons develop from the

metencephalon

The thin partition that separates the first and second ventricles is the

septum pellucidum.

The most abundant class of neuron in the central nervous system is

multipolar

The cytoplasm that surrounds the nucleus of a neuron is called the

perikaryon

Which of the following is a function of the thalamus?

process sensory information and relay it to the cerebrum

The ________ is the area monitored by a single receptor cell.

receptive field

Which of the following is a type of glial cell found in the peripheral nervous system?

satellite cells

Ascending tracts in the spinal cord relay ________ information.

sensory

If the dorsal root of a spinal nerve is severed,

sensory input would be blocked.

What contains a spider web-like network of cells and fibers through which cerebrospinal fluid flows?

subarachnoid space

A receptor that contains many mechanically-gated ion channels would function best as a

tactile receptor.