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27 lip 2023 · The visual pathway refers to the anatomical structures responsible for the conversion of light energy into electrical action potentials that can be interpreted by the brain. It begins at the retina and terminates at the primary visual cortex (with several intercortical tracts).
- Optic Nerve
Optic disc (coronal view) The optic nerve head (also known...
- Optic Tracts
The optic tract is a large bundle of nerve fibers of the...
- Myelin Sheath
Each neuron has four specialized regions to perform...
- Simple Epithelium
Simple squamous Simple epithelium can be divided into 4...
- Bones of the Orbit
The apex of the orbit is the optic foramen (canal), bound...
- Superior Orbital Fissure
Foramina of anterior cranial fossa (superior view) Olfactory...
- Optic Nerve
19 gru 2022 · The optic pathway begins in the retina, a complex structure of 10 layers, each serving a distinct function. The photoreceptor layers consist of rods and cones, which generate action potentials through photosensitive cycles with the help of rhodopsin.
Visual Pathways. The initial part of visual pathways is situated in the retina, where photoreceptors form synaptic connections with bipolar cells, which in turn synapse with ganglion neurons in the inner plexiform layer. These connections are referred to as the “vertical” or “through” pathway of the retina, whereas horizontal cells and ...
In the mammalian visual pathway, optic axons arising from ganglion cells in the ventro-temporal retina fail to decussate at the optic chiasm, projecting into the ipsilateral optic tract instead, thereby enabling binocular visual processing within each hemisphere without the need for inter-hemispheric connectivity.
24 lip 2023 · The visual pathway refers to the series of cells and synapses that transmit visual signals from the environment to the brain for processing. This pathway begins with light striking the specialized nerve cells of the retina, which convert photons of light into electrochemical signals.
Foundational processing of the visual environment occurs in the retina of the eyes, the lateral geniculate nucleus (LGN) in the thalamus, the primary visual cortex (V1), where visual recognition occurs, and the superior colliculus (SC) in the tectum, a center for eye movement (Figure 1 ).
The information from the eye is carried by the axons of the retinal ganglion cells (the 3° visual afferent) to the midbrain and diencephalon. This chapter will provide more information about visual pathway organization and the visual processing that occurs within the brain.
