Animalscaretips
- What does chiasm mean in anatomy?
- What is the main function of optic chiasm?
- What is optic chiasm?
- Where is optic chiasm?
- What is the meaning of bivalent in science?
- Who discovered chiasma?
- How does Bitemporal hemianopia occur?
- What visual field crosses at the chiasm?
- What supplies optic chiasm?
- Is optic chiasm part of corpus callosum?
- What is the blind spot?
- Which Fibres cross in optic chiasm?
- What does the word chiasm mean?
- What is chiasm disorder?
- What are the cranial nerve?
What does chiasm mean in anatomy?
In anatomy a chiasm is the spot where two structures cross, forming an X-shape (from Greek letter χ, Chi). This can be: A tendinous chiasm is the spot where two tendons cross.
What is the main function of optic chiasm?
The optic chiasm or optic chiasma is an X-shaped space, located in the forebrain, directly in front of the hypothalamus. Crucial to vision, the left and right optic nerves intersect at the chiasm, thus creating the hallmark X-shape.
What is optic chiasm?
At the optic chiasm, nerve fibers from half of each retina cross over to the opposite side of the brain. The fibers from the other half of the retina travel to the same side of the brain. Because of this junction, each half of the brain receives visual signals from the visual fields of both eyes.
Where is optic chiasm?
The optic chiasm is situated at the junction of the anterior wall and floor of the third ventricle. The anterior cerebral and anterior communicating arteries, the lamina terminalis, and the third ventricle are located above the chiasm.
What is the meaning of bivalent in science?
Definition of bivalent
(Entry 1 of 2) 1 chemistry : having a valence of two : divalent bivalent calcium. 2 genetics : associated in pairs in synapsis bivalent chromosomes. 3 immunology : having two combining sites a bivalent antibody capable of binding to two molecules of an antigen.
Who discovered chiasma?
The phenomenon of genetic chiasmata (chiasmatypie) was discovered and described in 1909 by Frans Alfons Janssens, a Professor at the University of Leuven in Belgium.
How does Bitemporal hemianopia occur?
A bitemporal hemianopia is almost always caused by damage to the optic chiasm and can occur from the direct or indirect effects of a variety of lesions, including tumors,1 aneurysms,2 and, less frequently, inflammatory and ischemic diseases.
What visual field crosses at the chiasm?
In the optic chiasm, the fibers of the nasal retina (i.e., the temporal visual field) of each eye cross, whereas the fibers of the temporal retina (i.e., the nasal visual field) of each eye proceed uncrossed.
What supplies optic chiasm?
Small branches of the anterior cerebral artery and the superior hypophyseal artery supply the chiasm and intracranial portion of the optic nerves whereas the optic tracts are supplied by small branches of the anterior choroidal and posterior communicating arteries.
Is optic chiasm part of corpus callosum?
The optic chiasm sends signals from one part of each eye (the left and right visual fields) to the appropriate part of the brain. This crossover occurs near the base of the frontal lobe and is not near the corpus callosum.
What is the blind spot?
blind spot, small portion of the visual field of each eye that corresponds to the position of the optic disk (also known as the optic nerve head) within the retina. There are no photoreceptors (i.e., rods or cones) in the optic disk, and, therefore, there is no image detection in this area.
Which Fibres cross in optic chiasm?
At the optic chiasm the optic nerve fibres from the nasal halves of the right and left retinas cross to the opposite side.
What does the word chiasm mean?
Definitions of chiasm. an intersection or crossing of two tracts in the form of the letter X. synonyms: chiasma, decussation. types: chiasma opticum, optic chiasm, optic chiasma. the crossing of the optic nerves from the two eyes at the base of the brain.
What is chiasm disorder?
Anatomical terms of neuroanatomy. Chiasmal syndrome is the set of signs and symptoms that are associated with lesions of the optic chiasm, manifesting as various impairments of the sufferer's visual field according to the location of the lesion along the optic nerve.
What are the cranial nerve?
Your cranial nerves are pairs of nerves that connect your brain to different parts of your head, neck, and trunk. There are 12 of them, each named for their function or structure. Each nerve also has a corresponding Roman numeral between I and XII.
