medial longitudinal fasciculus

(redirected from Medial longitudinal fascicle)

me·di·al lon·gi·tu·di·nal fas·cic·u·lus

[TA]
a longitudinal bundle of fibers extending from the upper border of the mesencephalon primarily into the cervical segments of the spinal cord, located close to the midline and anterior to the central gray matter; it is composed largely of fibers from the vestibular nuclei ascending to the motor neurons innervating the external eye muscles (abducens, trochlear, and oculomotor nuclei), and descending to spinal cord segments innervating the musculature of the neck.

me·di·al lon·gi·tu·di·nal fas·ci·cu·lus

(MLF) (mē'dē-ăl lon'ji-tū'di-nal fă-sik'kyū-lŭs) [TA]
Pathway in the brainstem that connects the vestibular system with the cranial nerves that serve the eye muscles (e.g., CNs III, IV, VI).

Collier,

James S., English physician, 1870-1935.
Collier sign - unilateral or bilateral lid retraction due to midbrain lesion. Synonym(s): Collier tucked lid sign
Collier tract - a longitudinal bundle of fibers extending from the upper border of the mesencephalon into the cervical segments of the spinal cord. Synonym(s): medial longitudinal fasciculus
Collier tucked lid sign - Synonym(s): Collier sign

fasciculus, medial longitudinal

One of a pair of nerve fibres, one on each side of the midline and extending from the upper midbrain to the cervical spinal cord. It is composed largely of ascending fibres from the vestibular nuclei ascending to the motor nuclei (third, fourth and sixth) and innervating the extraocular muscles; and to a lesser extent of descending fibres from the medial vestibular nuclei, the reticular formation, the superior colliculi and nucleus of Cajal innervating the musculature of the neck. Syn. medial longitudinal bundle; posterior longitudinal bundle.
References in periodicals archive ?
The overall organisation of the cat shark axon tracts is similar to that described for other vertebrates, including the early development of the medial longitudinal fascicle. Future work will involve lipophilic dye labelling of individual tracts to determine where neuronal populations are located and the mapping of the neuronal clusters against the molecular pattern of the embryonic brain, for example, the Pax6 expression domain marking the DMB [28].
Secondly, ischemic lesion extended to the rostral interstitial nucleus of the medial longitudinal fascicles (riMLF) or interstitial nucleus of Cajal placed in rostral-medial side of the red nucleus might bring Parinaud's syndrome [12].
One-and-a-half syndrome and medial longitudinal fascicles (MLF) syndrome are caused by the damage of paramedian area of the pons.

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