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THE NERVOUS SYSTEM. 275

deeper parts of the brain, extend outwardly, and terminate in the mus-
cular tissue ; example, the facial (the nerve of motion to the muscles of
the face).
Nei'ves of Sensation (or centripetal nerves) are those which convey
the impression received at their peripheral ends to the substance of the
Fig. 136.

TAL LOBE

PARIETAL LOBE
ST°- DIVISION OF
LVIAN FISSURE

TEMPOKO-SPHEN
OiaAL LOBE

IPITAL LOBE

Base of tlie Brain.

brain. (In the anatomical description of these and other nerves their
course is given from the brain outward.) Example, the first two divis-
ions of the fifth pair, which gives sensation to the upper two-thirds of
the face.
Nerves of Special Sense (centripetal) are those which convey the impres-
sion made upon their peripheral ends, conveying such impression to a
particular cell of the brain ; example, the optic receiving impressions from
the retina and conveying them to certain centres within the brain.