Essentials of Anatomy and Physiology

CRANIAL NERVES

The 12 pairs of cranial nervesemerge from the brain
stem or other parts of the brain—they are shown in
Fig. 8–11. The name cranialindicates their origin, and
many of them do carry impulses for functions involv-

ing the head. Some, however, have more far-reaching

destinations.

The impulses for the senses of smell, taste, sight,

hearing, and equilibrium are all carried by cranial

nerves to their respective sensory areas in the brain.

Some cranial nerves carry motor impulses to muscles

of the face and eyes or to the salivary glands. The

186 The Nervous System

Subarachnoid space

Cranial

meninges

Dura mater

Arachnoid

Fourth ventricle

Arachnoid villus

Choroid plexus of

fourth ventricle

Corpus

callosum

Cerebellum

Cerebral aqueduct

Pia mater

Cranial venous sinus

Cerebrum

Subarachnoid space

Central canal

Pons

Medulla

Spinal cord

Spinal meninges

Pia mater

Arachnoid

Dura mater

Subarachnoid space

Hypothalamus

Third ventricle

Choroid plexus of

third ventricle

Choroid plexus of

lateral ventricle

Lateral

ventricle

Figure 8–10. Formation, circulation, and reabsorption of cerebrospinal fluid. See text for

description.

QUESTION:In this pathway, where is the CSF reabsorbed, and into what?