Three Step Test for Cyclovertical Muscle Palsy - EyeWiki
The three-step test, also known as the Parks-Bielschowsky three-step test or the Parks-Helveston three-step test, is a diagnostic test used to identify which muscle is paretic in the case of an acquired hypertropia.
Cranial nerves examination: Trochlear & abducens nerves
Jul 12, 2023 · The trochlear nerve (CN IV) is a paired cranial nerve that is responsible for innervating the superior oblique muscle. As a result, it causes the eyeball to move downward and inward.
Trochlear Nerve (CN IV): What It Is, Function & Anatomy - Cleveland Clinic
Your trochlear nerve, also known as the cranial nerve 4 or CN IV, is a motor (movement) nerve that sends signals from your brain to one of the muscles that control eye movement. You have two trochlear nerves — one for each eye. They’re one of 12 sets of cranial nerves.
Trochlear nerve - Wikipedia
Clinical significance. Vertical diplopia. Injury to the trochlear nerve cause weakness of downward eye movement with consequent vertical diplopia (double vision). The affected eye drifts upward relative to the normal eye, due to the unopposed actions of the remaining extraocular muscles.
Trochlear Nerve - Physiopedia
The trochlear nerve transmits general somatic efferent impulses, which synapse in the skeletal fibers of the superior oblique muscle. The superior oblique muscles allow for depression, abduction, and medial rotation (intortion) of the eyeball.
Trochlear Nerve: Anatomy, Function, Symptoms, and More - WebMD
Oct 11, 2022 · The trochlear nerve, also known as cranial nerve 4 (CN IV), controls the superior oblique muscle in your eye. This muscle allows you to move your eyeball down and shift your gaze from side to...
The Cranial Neuropathies: Oculomotor, Trochlear and Abducens
Oct 15, 2024 · The Cranial Neuropathies: Oculomotor, Trochlear and Abducens. A guide to the clinical indications, causes and management strategies for the three nerve palsies affecting eye movement. By Leonard Messner, OD, Megan Piraino, OD, and Wendy Stone, OD.
Cranial Nerve Testing - StatPearls - NCBI Bookshelf
May 6, 2023 · Cranial nerve (CN) testing is the physical functional assessment of the nerves arising from the brain and innervating the head, neck, and trunk. This testing is widely applicable to emergency and clinical situations and can be performed relatively quickly with equipment readily available in the hospital or ambulatory environment. [1]
Trochlear Nerve: Anatomy, Function and 4th Nerve Palsy - All About Vision
Oct 12, 2022 · Also known as cranial nerve 4 (CN IV), the trochlear nerve controls the superior oblique muscle of the eye. This extraocular muscle allows the eyes to look downward, toward the nose, or away from the nose.
Trochlear Nerve: Anatomy, Function, and Treatment - Verywell …
Feb 23, 2022 · A doctor may suspect trochlear nerve problems when seeing characteristic problems with eye movement, especially if tilting the head helps. The suspicion can be confirmed via computed tomography (CT) scan or magnetic resonance imaging (MRI) of the brain.
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