Definition of Optic tract

1. Noun. The cranial nerve that serves the retina.




Medical Definition of Optic tract

1. The continuation of the optic nerve fibres beyond (behind) the latter's hemidecussation in the optic chiasm; each of the two symmetrical optic tracts is composed of fibres originating from the temporal half of the retina of the ipsilateral eye and a nearly equal number of fibres from the nasal half of the contralateral retina; it forms a compact, somewhat flattened fibre band passing caudolaterally alongside the base of the hypothalamus and over the basal surface of the crus cerebri; most of its fibres terminate in the lateral geniculate body; a smaller number of fibres enter the brachium of the superior colliculus, to terminate in the superior colliculus and the pretectal region. Synonym: tractus opticus. (05 Mar 2000)

Optic Tract Pictures

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Lexicographical Neighbors of Optic Tract

optic nerve meningioma
optic nerve sheath decompression
optic nerve sheath fenestration
optic nerves
optic neuritis
optic neuroma
optic papilla
optic part of retina
optic radiation
optic recess
optic sign
optic stalk
optic tectum
optic tract (current term)
optical
optical aberration
optical activity
optical antipode
optical art
optical astronomy
optical axis
optical bench
optical character recognition
optical condenser
optical crown
optical density
optical device

Literary usage of Optic tract

Below you will find example usage of this term as found in modern and/or classical literature:

1. Anatomy, Descriptive and Surgical by Henry Gray (1901)
"The optic tract, at its connection with the brain, is divided into two bands, external and internal. The external band is the larger ; it arises from the ..."

2. A Text-book of physiology by Michael Foster (1891)
"Thus the fibres of the temporal half of the right eye and of the nasal half of the left eye pass into the right optic tract, and the fibres of the nasal ..."

3. A Text Book of Physiology by Michael Foster (1894)
"Thus the fibres of the temporal half of the right eye and of the nasal half of the left eye pass into the right optic tract, and the fibres of the nasal ..."

4. The Principles and Practice of Medicine: Designed for the Use of by William Osler (1912)
"(4) Affections of the Tract and Centres The optic tract crosses the crus (cerebral peduncle) ... The lesion may be situated: (a) In the optic tract itself. ..."

5. Manual of Practical Anatomy by Daniel John Cunningham (1903)
"Diagram of the Roots of the optic tract. num. — Closely connected with tne brachia of the corpora quadrigemina will be seen the corpus geniculatum internum. ..."

6. The Encyclopaedia Britannica: A Dictionary of Arts, Sciences, Literature and (1910)
"In the bony fishes the optic tract reaches the grey matter of the optic lobe, ... In the optic lobe the axones of the neurones of the optic tract meet ..."

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