| A | B |
|---|
| afferent neuron | a nerve that carries nerve impulses from the periphery to the central nervous system |
| efferent neuron | carries messages from the brain or spinal cord to muscles, organs or glands |
| mixed nerve | nerve composed of both afferent (sensory) fibers and efferent (motor) fibers |
| associative neuron | carries messages from sensory neuron to motor neuron |
| fissures | the deep furrows within brain matter |
| sulci | fissures or grooves separating cerebral convolutions |
| gyri | convolutions in the brain |
| cerebral ventricles | four lined cavities within the brain filled with cerebrospinal fluid |
| cerebral cortex | a layer of gray matter covering the upper and lower surfaces of the cerebrum |
| cerebrospinal fluid | a substance that forms within the four brain ventricles from the blood vessels of the choroid plexus; this serves as a shock absorber protecting the brain and spinal cord |
| choroid plexus | a network of blood vessels of the pia mater |
| meninges | any of three linigs enclosing the brain and spinal cord |
| blood-brain barrier | substance cannot penetrate the brain tissue |
| cerebral aqueduct | a narrow canal connecting the third and fourth ventricles of the brain |
| diencephalon | posterior part of the brain; contains the thalamus, hypothalamus, and pituitary glans |
| limbic lobe | located in the center of the brain beneath the other four cerebral lobes, influences unconscious instinctive behavior |
