optic tract


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Related to optic tract: optic radiation

tract

 [trakt]
a longitudinal assemblage of tissues or organs, especially a number of anatomic structures arranged in series and serving a common function, such as the gastrointestinal or urinary tract; also used in reference to a bundle (or fasciculus) of nerve fibers having a common origin, function, and termination within the central nervous system.
alimentary tract alimentary canal.
biliary tract the organs, ducts, and other structures that participate in secretion (the liver), storage (the gallbladder), and delivery (hepatic and bile ducts) of bile into the duodenum. See illustration.
Anatomy of the gallbladder and biliary tract. From Aspinall and Taylor-Robinson, 2002.
corticospinal t's two groups of nerve fibers (the anterior and lateral corticospinal tracts) that originate in the cerebral cortex and run through the spinal cord.
digestive tract alimentary canal.
dorsolateral tract a group of nerve fibers in the lateral funiculus of the spinal cord dorsal to the posterior column.
extrapyramidal tract extrapyramidal system.
gastrointestinal tract the stomach and intestine in continuity; see also digestive system.
iliotibial tract a thickened longitudinal band of fascia lata extending from the tensor muscle downward to the lateral condyle of the tibia.
intestinal tract see intestinal tract.
optic tract the nerve tract proceeding backward from the optic chiasm, around the cerebral peduncle, and dividing into a lateral and medial root, which end in the superior colliculus and lateral geniculate body, respectively.
pyramidal t's collections of motor nerve fibers arising in the brain and passing down through the spinal cord to motor cells in the anterior horns.
respiratory tract respiratory system.
urinary tract the organs and passageways concerned in the production and excretion of urine from the kidneys to the urinary meatus; see also urinary system.
uveal tract the vascular tunic of the eye, comprising the choroid, ciliary body, and iris.

op·tic tract

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

op·tic tract

(op'tik trakt) [TA]
The continuation of the optic nerve fibers beyond their hemidecussation in the optic chiasm; each of the two symmetric optic tracts is composed of fibers originating from the temporal half of the retina of the ipsilateral eye and a nearly equal number of fibers from the nasal half of the contralateral retina; it forms a compact, somewhat flattened fiber band passing caudolaterally along the base of the hypothalamus and over the basal surface of the crus cerebri; most of its fibers terminate in the lateral geniculate body; a smaller number of fibers enter the brachium of the superior colliculus, to terminate in the superior colliculus and the pretectal region.
Synonym(s): tractus opticus [TA] .

optic tract

The part of the nerve pathway for visual impulses lying between the OPTIC CHIASMA and the first set of connections (SYNAPSES) in the brain—the lateral geniculate body. If an optic tract is destroyed half of the field of vision of each eye is lost. The field loss in each eye is on the side opposite to the damaged tract.
References in periodicals archive ?
In conclusion, we demonstrated via SS-OCT that characteristic hemianopic optic atrophy corresponds to the side of the optic tract lesion.
Whatever the structures that appeared on the lateral aspect of the brain were the olfactory bulb, cerebrum, cerebellum, Medulla oblongata, optic lobe, optic chiasm, optic tracts, and hypophysis.
Homonymous hemianopia-posterior portion of tumor involving the beginning of optic tracts. Visual field improvement following resection of the pituitary tumor occurs in three stages.
Hoffmann, "Strabismus disrupts binocular convergence in cat nucleus of the optic tract," Brain Research, vol.
Together these form the optic tracts. Once again the division of the fibres from each half of the retina is through the fovea as represented in the field of view by the point of fixation.
Additionally, there was extensive T2/FLAIR hyperintensity extending into both optic tracts. The working diagnosis at that time was of a pituitary macroadenoma.
Nerve tracts Anatomic Incorrectly accuracy displayed fibers BE SV BE SV Arcuate fasciculus 3.5 1.0 3.5 3.0 Corpus callosum 2.0 1.0 2.0 1.5 Left motor and 2.0 1.5 2.0 1.5 sensory tracts Right motor and 2.0 1.5 2.0 1.5 sensory tracts Optic tracts 4.0 3.0 4.0 4.0 Total 13.5 8 13.5 12.5 FIGURE 1: Clinical areas associated with the 200 surgeries assisted with 3D-printed models (a).
The subpedunculate body and nerve and other organs associated with the optic tracts of cephalopods.
the contract is for completion by comprehensive two-track overhead power line of 400 kv with fiber optic tracts with a new route between stations baczyna and krajnik with temporary work on one track line voltage of 220 kv.
Chen, "Validation of diffusion tensor magnetic resonance axonal fiber imaging with registered manganese-enhanced optic tracts," NeuroImage, vol.
Abnormalities of the corpus callosum and optic tracts can be seen in these patients.
Rudimentary optic tracts, gliotic lateral geniculate nuclei, thinner calcarine cortex was present, but in my case brain was normal.