optic radiation
Học thuậtThân thiện
Definition
- Noun:
- A nerve pathway from the lateral geniculate body to the visual cortex: The optic radiation is a bundle of nerve fibers (axons) in the brain that transmits visual information from the thalamus (specifically the lateral geniculate nucleus) to the primary visual cortex in the occipital lobe.
Usage Examples
- Noun:
- Damage to the optic radiation can result in a visual field defect.
- The visual signals travel along the optic radiation to reach the brain's processing center.
- The MRI scan showed a lesion affecting the left optic radiation.
Advanced Usage
- Clinical/Medical Context: The term is primarily used in neuroscience, neurology, ophthalmology, and anatomy to describe this specific neural tract. Discussions often involve its role in visual processing, consequences of its damage (e.g., homonymous hemianopia), and its appearance in neuroimaging.
- The neurologist localized the stroke to the area containing the optic radiation.
Variants and Related Words
- Geniculocalcarine tract: A synonym for the optic radiation, emphasizing its endpoints (from the geniculate nucleus to the calcarine sulcus/visual cortex).
- Visual pathway: A broader term that includes the optic radiation as a key component, along with the retina, optic nerve, optic chiasm, and lateral geniculate nucleus.
Synonyms
- Geniculocalcarine tract
- Geniculocalcarine radiation
Related Terms and Phrases
- Lateral geniculate nucleus (LGN): The thalamic relay station from which the optic radiation originates.
- Primary visual cortex (V1) / Striate cortex: The destination of the optic radiation in the occipital lobe.
- Meyer's loop: The anterior loop of the optic radiation fibers that carries information from the superior visual field.
- Homonymous hemianopia: A type of vision loss associated with damage to the optic radiation on one side of the brain.
Noun
- a nerve pathway from the lateral geniculate body to the visual cortex