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Cranial Nerves > Optic Nerve > Flashcards

Optic Nerve Flashcards

1
Q

Why is optic nerve not a true peripheral nerve?

A

It is actually a tract of brain for it develops as an outgrowth of diencephalic during embryonic life

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2
Q

Special features hence?

A

2nd order sensory neurons
Myelinated by oligodendrocytes
Surrounded by meninges
Fibres cannot regenerate if cut/damaged.

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3
Q

Functional component?

A

Special somatic afferent fibres

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4
Q

Course

A

Ganglion cells of retina- optic nerve- middle cranial fossa through optic canal- optic chiasma- optic tracts- lateral geniculate body- optic radiation- visual cortex (calcarine sulcus of occipital lobe)

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5
Q

So therefore it’s divided into three parts which are?

A

Intraorbital
Canalicular
Cranial

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6
Q

In the optic chiasma, what lies medial?

A

Crossed temporal fibres lie medial

Uncrossed nasal fibres lie lateral

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Cranial Nerves (6 decks)

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