visual tract

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• Visual system — The visual system includes the eyes, the connecting pathways through to the visual cortex and other parts of the brain. The illustration shows the mammalian system. The visual system is the part of the central nervous system which enables… …   Wikipedia

• Visual cortex — Brain: Visual cortex View of the brain from behind. Red = Brodmann area 17 (primary visual cortex); orange = area 18; yellow = area 19 …   Wikipedia

• tract — An elongated area, e.g., path, track, way. SEE ALSO: fascicle. SYN: tractus. [L. tractus, a drawing out] alimentary t. SYN: digestive t.. anterior corticospinal t. uncrossed fibers forming a small bundle in the anterior funiculus of the …   Medical dictionary

• Visual acuity — 20/15 and 20/15 vision redirect here. For other uses, see 2020 (disambiguation). Typical Snellen chart used for visual acuity testing. Visual acuity (VA) is acuteness or clearness of vision, which is dependent on the sharpness of the retinal… …   Wikipedia

• Tract housing — Aerial view of housing developments near Markham, Ontario. Tract housing is a style of housing development in which multiple similar homes are built on a tract of land which is subdivided into individual small lots. Tract housing developments are …   Wikipedia

• Visual nerve pathways — The optic nerves serving the eyes join behind the eyes just in front of the pituitary gland to form a cross shaped structure called the optic chiasma. Within the optic chiasma some of the nerve fibers cross. The fibers from the nasal (inside)… …   Medical dictionary

• visual system — noun the sensory system for vision • Topics: ↑sight, ↑vision, ↑visual sense, ↑visual modality • Hypernyms: ↑sensory system • Part Meronyms: ↑eye …   Useful english dictionary

• visual system — the series of structures by which visual sensations are received from the environment and conveyed as signals to the central nervous system; it consists of the photoreceptors in the retina and the afferent fibers in the optic nerve, chiasm, and… …   Medical dictionary

• visual pathway — the sensory pathway for sight, conducting impulses from the photoreceptors to the cerebral cortex by way of the optic nerve, optic tract, and optic radiation …   Medical dictionary

• Optic tract — Brain: Optic tract The left optic nerve and the optic tracts. Latin tractus opticus Gray s subject #189 814 …   Wikipedia

• Tectospinal tract — Diagram showing possible connection of long descending fibers from higher centers with the motor cells of the ventral column through association fibers. ( Tectospinal fasciculus labeled at center right.) …   Wikipedia