trochlearis
Noun (Anatomy) The trochlearis is the anatomical name for the fourth cranial nerve (CN IV). It is a motor nerve that innervates a single muscle: the superior oblique muscle of the eye. Its primary function is to control specific eye movements, particularly downward and inward rotation (intorsion) of the eyeball.
The term trochlearis is used almost exclusively in formal medical, anatomical, and neurological contexts to refer to this specific cranial nerve. * The trochlearis nerve has the longest intracranial course of any cranial nerve. * Damage to the trochlearis can result in vertical diplopia (double vision) and a head tilt to compensate. * The examination tested the function of the oculomotor, trochlearis, and abducens nerves.
- Trochlear nerve palsy: This is the clinical term for dysfunction or paralysis of the trochlearis nerve, often causing difficulty looking downward and inward.
- The patient's head tilt was a classic sign of congenital trochlear nerve palsy.
- Trochlear Nerve: This is the more common clinical and general anatomical term, synonymous with "trochlearis."
- Cranial Nerve IV (CN IV): The numerical designation for the trochlearis.
- Superior Oblique Muscle: The sole muscle innervated by the trochlearis nerve.
- Fourth cranial nerve
- Trochlear nerve
The word trochlearis is a highly specialized anatomical term with only one primary meaning related to the cranial nerve. It derives from the Latin trochlea, meaning "pulley," which refers to the pulley-like structure (the trochlea) through which the tendon of the superior oblique muscle passes.
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either of the two cranial nerves on either side that control the superior oblique muscles of the eyes
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