Trochlear Nerve Definition: The trochlear nerve (the fourth cranial nerve, also called the fourth nerve, IV) is a motor nerve (a “somatic efferent” nerve) that innervates a single muscle: the superior oblique muscle of the eye. Trochlear Nerve Nuclie: The nucleus of the trochlear nerve is located in the caudal mesencephalon beneath the cerebral aqueduct. It is immediately below the nucleus of the oculomotor nerve (III) in the rostral mesencephalon. The trochlear nucleus is ... Read More »
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Oculomotor Nerve Definition: is the 3rd of 12 paired cranial nerves. It enters the orbit via the sup...
Trochlear Nerve Definition: The trochlear nerve (the fourth cranial nerve, also called the fourth ne...
Oculomotor Nerve Definition: is the 3rd of 12 paired cranial nerves. It enters the orbit via the superior orbital fissure and controls most of the eye’s movements, including constriction of the pupil and maintaining an open eyelid by innervating the levator palpebrae superioris muscle. The oculomotor nerve is derived from the basal plate of the embryonic midbrain. Cranial nerves IV and VI also participate in control of eye movement. It is somatovisceral nerve. ... Read More »