optic chiasm definition
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Optic chiasma Optic chiasma. 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. One-half of each nerve's axons (their long, threadlike portions) enters the opposite tract at this location, making it a partial decussation (crossing).
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disease Devic's disease A demyelinative disease of the optic nerve, the optic chiasma and the spinal cord characterized by a bilateral acute optic neuritis with a transverse inflammation of the spinal cord. Loss of visual acuity occurs very rapidly and is accompanied by ascending paralysis.
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OPTIC CHIASM the locale at the bottom of the brain where the optic nerves from both eyes meet each other. In humans, the nerve fibers from the nasal half of each retina intersect, so each hemisphere of the brain gathers input from both eyes. This partial intersection is referred to as a partial decussation.
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- This nerve, an outgrowth of. the diencephalon, leaves the orbit via the optic canal to enter. the middle cranial fossa. There, the optic nerves of the right. and left sides join each other to form the optic chiasma(G., “optic crossing”) where partial decussation of the optic nerve. ﬁbers of the two sides takes place.
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The Optic Nerve (CN II) and Visual Pathway Anatomical Course. The anatomical course of the optic nerve describes the transmission of special sensory information from the retina of the eye to the primary visual cortex of the brain. It can be divided into extracranial (outside the cranial cavity), and intracranial parts. Extracranial.
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chiasm n an intersection or crossing of two tracts in the form of the letter X. the crossing of the optic nerves from the two eyes at the base of the brain. a particular complex anatomical part of a living thing. Word Family.
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What is a chiasm / chiastic structure in the Bible? Answer: A chiasm (also called a chiasmus) is a literary device in which a sequence of ideas is presented and then repeated in reverse order. The result is a mirror effect as the ideas are reflected back in a passage. Each idea is connected to its reflection by a repeated word, often in a related form.
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Optic chiasm The crossing over of optic nerve fibres at the optic chiasm allows the visual cortex to receive the same hemispheric visual field from both eyes. Superimposing and processing these monocular visual signals allow the visual cortex to generate binocular and stereoscopic vision.
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chiasm chiasm - an intersection or crossing of two tracts in the form of the letter X. chiasma, decussation. anatomical structure, bodily structure, body structure, complex body part, structure - a particular complex anatomical part of a living thing; he has good bone structure. chiasma opticum, optic chiasm, optic chiasma - the crossing of the optic nerves from the two eyes at the base of the brain.
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- noun, plural chiasmas, chiasmata. [kahy-az-muh-tuh] /kaɪˈæz mə tə/ (Show IPA) 1. Anatomy. a crossing or decussation, as that of the optic nerves at the base of the brain. 2. Cell Biology. a point of overlap of paired chromatids at which fusion and exchange of genetic material take place during prophase of meiosis. Also, chiasm.
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What's a Chiasm? What's a Chiasm? A chiasm (or chiasmus if you rather) is a writing style that uses a unique repetition pattern for clarification and/or emphasis. Chiasm is pronounced ky′-az-um. Often called the chiastic (ky′-az-tic) approach or the chiastic structure, this repetition form appears throughout the Bible yet it is not well known.
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Crainial nerves and parts of the eye (path of) optic nerve. cranial nerve II; the sensory nerve which carries electrical impulses from visual stimuli in the retina out of the eye, across the optic chiasm, and to the ventral part of the diencephalon, on their way to the visual cortex in the occipital cortex of the brain for interpretation.
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axis optic axis. 1. a line connecting the center of the anterior curvature of the cornea (anterior pole) with that of the posterior curvature of the sclera (posterior pole). 2. the hypothetical straight line passing through the centers of curvature of the front and back surfaces of a simple lens.
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Optic chiasm The optic chiasm or optic chiasma (Greek χίασμα, crossing, from the Greek χιάζω 'to mark with an X', after the Greek letter ' χ ', chi) is the part of the brain where the optic nerves (CN II) partially cross.
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The Optic Nerve The optic nerve, which acts like a cable connecting the eye with the brain, actually is more like brain tissue than it is nerve tissue. visual pathway. As the optic nerve leaves the back of the eye, it travels to the optic chiasm, located just below and in front
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optic nerve optic nerve. n. Either of the second pair of cranial nerves that arise from the retina and carry visual information to the thalamus and other parts of the brain. optic nerve. n. (Physiology) the second cranial nerve, which provides a sensory pathway from the retina to the brain.
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structure 1. chiasm-an intersection or crossing of two tracts in the form of the letter X. chiasma, decussation. anatomical structure, bodily structure, body structure, complex body part, structure-a particular complex anatomical part of a living thing; he has good bone structure.
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optic chiasm optic chiasm a structure in the forebrain formed by the decussation of fibers of the optic nerve from each half of each retina.
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Overview of Optic Nerve Disorders Visual Pathways and the Consequences of Damage. Nerve signals travel along the optic nerve from each eye. The two optic nerves meet at the optic chiasm. There, the optic nerve from each eye divides, and half of the nerve fibers from each side cross to the other side.
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Pituitary Adenoma Causing Compression of the Optic Chiasm Specifically, in this patient the left optic nerve and the optic chiasm were most affected, as evidenced by the visual acuity loss OS and the temporal visual field loss OD with preservation of visual acuity. Thus, our chief concern was for a sellar mass.
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Chiasmal syndrome The optic nerves consist of the axons from the retinal ganglion of each eye. At the chiasm, 53% of the axons from the nasal retina cross the midline to join the uncrossed temporal fibers. These nasal fibers carry information from the temporal visual field.
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- The optic nerve is a motor nerve that connects the retina of the eye with the brain. This nerve penetrates the choroid and the sclera from the rear of the eye at the optic disc where it is met with the other optic nerve to form the optic chiasma.he eye consists of three layers of tissue which make up the wall of the eye. The sclera is the outermost layer of tissue, also called the white of the eye.
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Optic glioma 1 One or both of the optic nerves that carry visual information to the brain from each eye.  The optic chiasm, the area where the optic nerves cross each other in front of the hypothalamus of the brain.
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What Is the Optic Chiasm and How Does it Affect Vision? How disease affects the optic nerve tract: When a disease or lesion affects the optic nerve before it reaches the optic chiasm in the brain, the defect in the the vision will show up on only one side or one eye and can affect the entire field of that eye.
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Optic flow Optic flow is defined as the change of structured light in the image, e.g. on the retina or the camera’s sensor, due to a relative motion between the eyeball or camera and the scene.n the literature, the motion field is often confounded with the optic flow, which is defined by the temporal change of the registered patterns of light. The motion field as analytic model was formulated for a pinhole camera in locomotion.
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Chiasmal syndrome 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 contralateral side while the temporal fibers course posteriorly to form the optic tract on the ipsilateral side.