Download CRANIAL NERVE NUCLEI

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CRANIAL NERVE NUCLEI 1-6 NERVES
I Olfactory nerve Purely Sensory
Optic nerve Purely Sensory
III Oculomotor nerve Mainly Motor
IV Trochlear nerve Mainly Motor
V Trigeminal nerve Both Sensory and Motor
VI Abducens nerve Mainly Motor
CRANIAL NERVE NUCLEI
Olfactory nerve
CRANIAL NERVE II
• Optic nerve
VISUAL PATHWAY
NEURONS INVOLVED IN VISUAL PATHWAY
4 neurons are involved
 Rods and cones
 Bipolar neurons
 Ganglion cells
 Neurons of lat. Geniculate bodies
VISUAL LIGHT REFLEX
CRANIAL NERVE NUCLEI
(L.S OF BRAINSTEM)
OCCULOMOTOR NERVE
• It has 2 motor nuclei (At superior colliculus)
The main motor nuclei
• The accessory parasympathetic nucleus (Edinger Westphal nucleus)
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TROCHLEAR NERVE
Most slender cranial nerve
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Motor Nucleus located At inferior colliculus
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TROCHLEAR NERVE
Only nerve to leave the posterior surface of the brain
stem,
emerge from the midbrain & immediately decussate
with nerve from the opposite side
Supplies the superior oblique muscle
Function is to turn the eye ball downward & laterally
ABDUCENT NERVE
Posterior margin of Pons
Has motor Abducens nucleus
Innervates the lateral rectus, which abducts the eye;
Located in superior orbital fissure
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TRIGEMINAL NERVE
Both Sensory and Motor
Emerges from pons
4 nuclei
Principal sensory nucleus,
Spinal nucleus,
Mesencephalic nucleus,
Trigeminal motor nucleus
TRIGEMINAL NERVE
TRIGEMINAL NERVE
TRIGEMINAL NERVE
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The ophthalmic nerve (V1) carries sensory information from the scalp
and forehead, the upper eyelid, the conjunctiva and cornea of the eye,
the nose (including the tip of the nose, except alae nasi), the nasal
mucosa, the frontal sinuses, and parts of the meninges (the dura and
blood vessels).
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The maxillary nerve (V2) carries sensory information from the lower
eyelid and cheek, the nares and upper lip, the upper teeth and gums,
the nasal mucosa, the palate and roof of the pharynx, the maxillary,
ethmoid and sphenoid sinuses, and parts of the meninges.
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The mandibular nerve (V3) carries sensory information from the lower
lip, the lower teeth and gums, the chin and jaw (except the angle of the
jaw, which is supplied by C2-C3), parts of the external ear, and parts of
the meninges. The mandibular nerve carries touch/position and
pain/temperature sensation from the mouth. It does not carry taste
sensation (chorda tympani is responsible for taste), but one of its
branches, the lingual nerve, carries multiple types of nerve fibers that
do not originate in the mandibular nerve.
 I Olfactory olfactory foramina Cribriform plate of ethmoid
 II Optic nerve optic canal
 III Oculomotor nerve superior orbital fissure
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IV Trochlear nerve superior orbital fissure
V Trigeminal nerve
superior orbital fissure (ophthalmic nerve - V1),
foramen rotundum (maxillary nerve - V2),
foramen ovale (mandibular nerve - V3)
VI Abducens nerve superior orbital fissure