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The medial longitudinal fasciculus is the main central connection for the oculomotor nerve, trochlear nerve, and abducens nerve. It carries information about the direction that the eyes should move. Lesions of the medial longitudinal fasciculus can cause nystagmus and diplopia, which may be associated with multiple sclerosis, a neoplasm, or a ...
It is located anterior and lateral to the medial longitudinal fasciculus. [citation needed] It is continuous caudally with the nucleus prepositus hypoglossi. [4] The PPRF (and adjacent regions of the pons) are traversed by fibers projecting to the abducens nucleus that mediate smooth pursuit, vestibular reflexes, and gaze holding. [5]: 498
Medial longitudinal fasciculus; Myoclonic triangle; Solitary tract; ... "Brain Anatomy and How the Brain Works". Johns Hopkins Medicine. 14 July 2021. "Brain Map".
It is situated in the dorsomedial portion of the rostral mesencephalic tegmentum [3]: 458.e1 near its junction with the diencephalon, [1] in between the (midline) periaqueductal gray and (ipsilateral) red nucleus, [3]: 458.e1 near the oculomotor nucleus, [2]: 321-322 caudal to the rostral interstitial nucleus of medial longitudinal fasciculus ...
the ascending branches send terminals and collaterals to the motor nuclei of the abducens, trochlear and oculomotor nerves via the ascending component of the medial longitudinal fasciculus, and are concerned in coordinating the movements of the eyes with alterations in the position of the head;
It receives afferents from the visual association areas (via the corticotectal tract), [2]: 241 vestibular nuclei (via the medial longitudinal fasciculus), [2]: 402 and from the spinomesencephalic tract. [3]: 433.e1
In humans, the tectospinal tract (or colliculospinal tract) is a decussating extrapyramidal tract that coordinates head/neck and eye movements. [1]It arises from the superior colliculus of the mesencephalic (midbrain) tectum, and projects to the cervical and upper thoracic spinal cord levels. [2]
Diagram showing a few of the connections of afferent (sensory) fibers of the posterior root with the efferent fibers from the ventral column and with the various long ascending fasciculi. (Spinotectal fasciculus labeled at bottom right.)