trochlear nerve


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trochlear nerve

[′träk·lē·ər ‚nərv]
(neuroscience)
The fourth cranial nerve; either of a pair of somatic motor nerves which innervate the superior oblique muscle of the eyeball.
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The long intracranial course of the trochlear nerve makes it especially prone to injury in closed head traumas.
ACVF, anterior cerebral vein foramen; AFPC, anterior foramen for preorbital canal; ANTO, antorbital condyle; ELF, endolymphatic foramen; ES, eye stalk; ESAF, efferent spiracular artery foramen; F, fontanelle; FM, foramen magnum; ICAF, internal carotid artery; LC, lateral commissure; NC, nasal capsule; OC, occipital condyle; OF, orbital fissure; PFPC, posterior foramen for preorbital canal; PLF, perilymphatic foramen; PROP, preorbital process; POST, postorbital process; R, rostrum; SOC, supraorbital crest; II, optic nerve foramen; IV, trochlear nerve foramen; VII, hyomandibular branch of facial nerve foramen; X, vagus nerve foramen.
The entering into the CS trough this wall can be trough the triangular spaces between the oculomotor and trochlear nerves (supratrochlear triangle) or between the trochlear nerve and the upper edge of V1 (Infratrochlear or Parkinson's triangle).
Tumescent anesthesia was also used at the recipient area after the supra-orbital/supra- trochlear nerve block.
Frontal nerve on Levator palpebrae superioris, Trochlear nerve at medial and lacrimal nerve at lateral aspect of orbit were identified.
30%), perhaps with a preponderance of isolated trochlear nerve involvement due to a higher congenital incidence, (7) with multiple palsies accounting for the remaining approximately 10% of cases.