There are 12 pairs of cranial nerves that originate directly from the brain. They are the olfactory, optic, oculomotor, trochlear, trigeminal, abducens, facial, vestibulocochlear, glossopharyngeal, vagus, accessory, and hypoglossal nerves. The document provides details on the olfactory, optic, oculomotor, trochlear, trigeminal, and abducens nerves, including their origins, paths, and functions.

2. INTRO CTI
There are 12 pairs of cranial nerves in our body
These are called as cranial nerve because the
originated directly from the brain; inside the cranium
There names are
° Olfactory nerve
O Optic nerve
° Oculomotor nerve
° Trochlear nerve
° Trigeminal nerve
° Abducens nerve
Facial nerve
Vestibulocochlear nerve
Glossopharangial nerve
Vagus nerve
Accessory nerve
Hypoglossal nerve

3. CRANIAL NERVE
OLFACTORY
Arises from the olfactory epithelium
Passes through the cribriform plate of the
ethmoid bone
Fibers run through the olfactory bulb and
terminate in the primary olfactory cortex
Functions solely by carrying afferent impulses for
the sense of smell

6. CRANIAL NERVE II: OPTIC
Arises from the retina of the eye
Optic nerves pass through the optic canals
and converge at the optic chiasm
They continue to the thalamus where they
synapse
From there, the optic radiation fibers run
to the visual cortex

8. Optic Nerve 2

9. CRANIAL NERVE
CULOMOTOR
Fibers extend from the ventral midbrain,
pass through the superior orbital fissure,
and go to the extrinsic eye muscles.
III

12. CRANIAL NERVE
TROCHLEAR
Fibers emerge from the dorsal midbrain and
enter the orbits via the superior orbital fissures;
innervate the superior oblique muscle
Primarily a motor nerve that directs the eyeball

14. CRANIAL NERVE
TROCHLEAR
Superior oblique muscle
Superior orbital fissure
Trochlear nerve(IV)

15. Trigeminal Nerve- V
Composed of three divisions
Ophthalmic (V1)
Maxillary (V2)
Mandibular(V3)
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19. Cranial Nerve
V-Trigeminal Nerve

20. VI - ABDUCENS
Fibers leave the inferior pons and enter the orbit via the
superior orbital fissure
Primarily a motor nerve innervating the lateral rectus
muscle (abducts the eye; thus the name abducens)
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Lateral rectus muscle
Superior orbital fissure
Abducens nerve (VI)