Optic Chiasm Wikidoc The optic chiasm (greek χίασμα, "crossing", from the greek χλαζειν 'to mark with an x', after the greek letter ' Χ ', chi) is the part of the brain where the optic nerves partially cross. In vertebrates with a large overlap of the visual fields of the two eyes, i.e., most mammals and birds, but also amphibians, reptiles such as chameleons, the two optic nerves merge in the optic chiasm.
Optic Chiasm Wikidoc What is the optic chiasm? the optic chiasm, or optic chiasma, is an x shaped structure at the base of the brain. the left and right eye’s optic nerves intersect here, combining visual information before moving further down the visual pathway to the brain. It is formed by the decussating nerve fibers (axons) of the two optic nerves, one from each eye, as they travel to the brain to transmit visual information. each optic nerve contains slightly more than 1 million retinal ganglion cell axons. Fibers of the optic nerve (cn ii) extend posteriorly from each eye and intersect within the middle cranial fossa, forming the optic chiasm. the optic chiasm is located at the base of the brain, just anterior and superior to the location of the pituitary gland. As above, the currently accepted concept is that adjacent nerve fibres travelling along an optic nerve serve immediately adjacent portions of the visual field and that this relationship is preserved throughout the optic nerves, through the chiasm and on into the optic tracts.
Optic Chiasm Wikidoc Fibers of the optic nerve (cn ii) extend posteriorly from each eye and intersect within the middle cranial fossa, forming the optic chiasm. the optic chiasm is located at the base of the brain, just anterior and superior to the location of the pituitary gland. As above, the currently accepted concept is that adjacent nerve fibres travelling along an optic nerve serve immediately adjacent portions of the visual field and that this relationship is preserved throughout the optic nerves, through the chiasm and on into the optic tracts. The optic nerve transmits special sensory information for sight. it is one of two nerves that do not join with the brainstem (the other being the olfactory nerve). At the optic chiasm the two optic nerves fuse, and fibers from each eye cross the midline or turn back and remain uncrossed. having adopted their pathways the fibers separate to form the two optic tracts. The optic chiasm is formed by the union of the two optic nerves. the nasal fibers of each optic nerve decussate (cross) across the chiasm to the opposite side while the temporal fibers course posteriorly to form the optic tract on the same side. Evolutionary processes may change the direction of retinal ganglial cells. crossing, or non crossing, in the optic chiasm determines which hemisphere receives visual feedback in reaching tasks. each hemisphere receives little tactile and proprioceptive information about the ipsilateral hand.
Optic Chiasm Wikidoc The optic nerve transmits special sensory information for sight. it is one of two nerves that do not join with the brainstem (the other being the olfactory nerve). At the optic chiasm the two optic nerves fuse, and fibers from each eye cross the midline or turn back and remain uncrossed. having adopted their pathways the fibers separate to form the two optic tracts. The optic chiasm is formed by the union of the two optic nerves. the nasal fibers of each optic nerve decussate (cross) across the chiasm to the opposite side while the temporal fibers course posteriorly to form the optic tract on the same side. Evolutionary processes may change the direction of retinal ganglial cells. crossing, or non crossing, in the optic chiasm determines which hemisphere receives visual feedback in reaching tasks. each hemisphere receives little tactile and proprioceptive information about the ipsilateral hand.
Optic Chiasm Wikidoc The optic chiasm is formed by the union of the two optic nerves. the nasal fibers of each optic nerve decussate (cross) across the chiasm to the opposite side while the temporal fibers course posteriorly to form the optic tract on the same side. Evolutionary processes may change the direction of retinal ganglial cells. crossing, or non crossing, in the optic chiasm determines which hemisphere receives visual feedback in reaching tasks. each hemisphere receives little tactile and proprioceptive information about the ipsilateral hand.
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