The olfactory tract and bulb, the corpora quadrigemina, corpora genicolate, optic thalamus, corpora striata, are all more or less mixed. They possess gray matter.
The nerves immediately connected with the brain are of several kinds. And there are twelve pairs of them. They are called cerebral nerves.
There are four kinds.
1. Nerves of special sense.
2. Nerves of common sensation.
3. Nerves of motion.
4. Mixed nerves of sensation and motion.
The nerves of special sense may with great propriety be termed the nerves of observation, perception—the gateways of intelligence and education.
I.—Nerves of special sense:
1. The olfactory supplies the nose, special sense of smell.