Distinguish between:
$(1)$ Sensory nerve and Motor nerve.
$(2)$ Corpus callosum and Ciliary body.

(N/A) $(1)$ Sensory nerve: These nerves carry nerve impulses from sensory organs or tissues to the $C.N.S.$ (Central Nervous System).
Motor nerve: These nerves carry nerve impulses from the $C.N.S.$ to effector organs like muscles or glands.
$(2)$ Corpus callosum: It is a tract of nerve fibres that connects the two cerebral hemispheres.
Ciliary body: The choroid layer becomes thick in the anterior $1/3$ part of the eyeball to form the ciliary body,which holds the lens in place.