Download 10-5_CranNervEyeMov_MitsM

Mits Márti
Márti Mits, EB4XGQ, Nov 24, 2016
Cranial nerves
regulating eye movements, accomodation and involved
in eye-protection
What are the nerves that are responsible for eye movements?
These nerves are:
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Cranial nerve III – Oculomotor
Cranial nerve IV – Trochlear
Cranial nerve VI – Abducens
Oculomotor nerves innervate all the other ocular muscles:
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It originates from the third nerve nucleus
"The oculomotor nerve includes axons of type GSE, general somatic
efferent, which innervate skeletal muscle
The nerve also includes axons of type GVE, general visceral efferent"
Source: https://en.wikipedia.org/wiki/Oculomotor_nerve
Trochlear nerves innervate the superior oblique muscles and they are
responsible for looking downwards and inwards
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It has the greatest intracranial length
It is the only cranial nerve which leaves the brain stem at the dorsal side
of it.
Abducens nerves innervate lateral rectus muscles which are responsible for
the abduction of the eye
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It is a somatic efferent nerve so it carries nerve impulses away form the
central nevous system.
This nerve leaves the brain stem at the junction of the medulla and the
pons.
(After leaving the brain stem) It reaches the eye by running upward
then bending forward.