Chiasm       Article     History   Tree Map
  Encyclopedia of Keywords > Optic Nerves > Chiasm   Michael Charnine

Keywords and Sections
Review of Short Phrases and Links

    This Review contains major "Chiasm"- related terms, short phrases and links grouped together in the form of Encyclopedia article.


  1. Optic Chiasm is located beneath the hypothalamus and is where the optic nerve crosses over to the opposite side of the brain.
  2. The optic chiasm is located at the bottom of the brain immediately below the hypothalamus.
  3. From the chiasm, the optic tract continues in a posterolateral direction around the cerebral peduncle to enter the middle incisural space (Fig.
  4. The optic chiasm is visible here, hanging down below the base of the brain. (Web site)
  5. The optic chiasm is formed by the union of the two optic nerves. (Web site)

Anterior Incisural Space

  1. The part of the anterior incisural space located below the optic chiasm has posterolateral and posterior walls.
  2. The anterior incisural space extends from the interpeduncular fossa, around the chiasm, and into the suprachiasmatic area.


  1. Anterior chiasmal syndrome affects the junction of the optic nerve and chiasm. (Web site)


  1. Medial sphenoid ridge types can push on the chiasm from the side. (Web site)
  2. You should see the cut ends of the internal carotid arteries (one on each side) posterior to the optic chiasm.


  1. The cavernous sinuses are lateral and inferior to the chiasm. (Web site)
  2. The supraoptic area is inferior to the preoptic area and just above the optic chiasm. (Web site)


  1. One is anterior and through the optic chiasm and the posterior section is through the thalami.


  1. If it does, the lesion is located at the level of the chiasm or posterior to it.
  2. TUNNEL VISION: Indicates a lesion at the optic chiasm. (Web site)


  1. It is a midline mass of tissue lying caudal to the optic chiasm.


  1. The optic nerves, chiasm, and tracts, and the oculomotor nerves cross the anterior incisural space.


  1. Bitemporal hemianopia with or without central scotoma is present if the lesions have affected the body of the chiasm. (Web site)
  2. Middle chiasmal syndrome relates to the decussating fibers in the body of the optic chiasm while posterior chiasmal syndrome involves the caudal fibers. (Web site)


  1. The optic chiasm, or chiasmatic sulcus, sits slightly posteriorly in the midline.

Third Ventricle

  1. Behind the chiasm lies the floor of the third ventricle. (Web site)


  1. It will then start to grow upward and start to push on the junction of the optic nerves where they cross (optic chiasm).
  2. With larger tumors, headaches and visual loss (from compression of the optic nerves or optic chiasm) can occur.
  3. Expansion of a pituitary mass superiorly can compress the optic chiasm, thus giving rise to bitemporal hemianopia. (Web site)

Visual Fields

  1. Damage in the chiasm causes loss of vision laterally in both visual fields (bitemporal hemianopia).

Optic Tracts

  1. The optic nerves, optic chiasm and optic tracts are prominent and will serve to orient you for the following structures. (Web site)

Pituitary Tumor

  1. Pituitary Tumor can impinge on the optic chiasm, causing tunnel vision.


  1. Others symptoms of significance include visual loss, caused by a tumor large enough to reach from the pituitary to the optic chiasm running above the sella. (Web site)


  1. These tumors generally are too small to cause bony erosion or to put pressure on the optic chiasm.


  1. This last test will reveal whether the tumor has affected the optic nerves or chiasm.
  2. Visual Loss When large pituitary adenomas ("macroadenomas") grow upward, the tumor can elevate and compress the optic chiasm.
  3. There are isolated reports of extraocular paralysis or severe exophthalmos due to infiltration of the tumor into the optic chiasm, nerves and orbit. (Web site)


  1. Damage in the chiasm causes loss of vision laterally in both eyes (bitemporal hemianopia).
  2. The nerves to your mouth and lower body are attached to the medulla; the nerves to your eyes are connected to the optic chiasm.


  1. The two optic tracts, representing the right and left visual fields, emerge posteriorly from the posterior chiasm. (Web site)
  2. A tight tumoral attachment to the junction of the posterior chiasm to the lamina terminalis was identified and dissected. (Web site)
  3. If the meningioma arises from the diaphragma sellae the posterior chiasm is damaged. (Web site)


  1. The SCN is situated in the hypothalamus immediately above the optic chiasm on either side of the third ventricle.
  2. This approach further lessens the radiation risk to the sensitive structures around the tumor, such as the optic chiasm and hypothalamus. (Web site)
  3. You can see the floor of the hypothalamus between the optic chiasm and the mamillary bodies.


  1. The crossing of the nasal half of macular fibers of central vision occurs posteriorly in the chiasm. (Web site)


  1. At the chiasm, 53% of the axons from the nasal retina cross the midline to join the uncrossed temporal fibers. (Web site)


  1. In this way the optic tracts, which extend from the chiasm to the thalamus, contain fibres conveying information from both eyes.
  2. Other parts of the cerebrum include the thalamus, hypothalamus, optic chiasm, and basal ganglia.
  3. In humans, about 60% of these fibers cross in the chiasm, while the other 40% continue toward the thalamus and midbrain targets on the same side. (Web site)


  1. A large tumor may cause loss of vision, particularly peripheral vision, if it compresses the optic chiasm (where the optic [eye] nerves converge). (Web site)
  2. Damage before the optic chiasm causes loss of vision in the visual field of the same side only. (Web site)
  3. For example, a tumor growing upward may affect the optic chiasm—where the optic nerves cross—leading to visual problems and vision loss. (Web site)


  1. Clues: a special sensory afferent nerve, has a chiasm, connected to the retina, the second cranial nerve, used in vision. (Web site)
  2. The optic nerve is composed of fibers from the retina to the optic chiasm.


  1. The nucleus is situated at the base of the brain, adjacent to the optic chiasm, and, in humans, it contains about 3,000 neurons. (Web site)
  2. DIENCEPHALON: third ventricle, interventricular foramina, optic chiasm In the anatomy of vertebrates, the prosencephalon is a part of encephalon, or brain.
  3. One experimenter cut the optic chiasm and forebrain commissures of monkeys after lesioning the amygdala on one side of the brain. (Web site)


  1. However, the inferonasal fibers pass more anteriorly in the chiasm while the superonasal fibers pass more posteriorly. (Web site)
  2. It extends from the optic chiasm (OC) anteriorly (forward) to the mammillary bodies (MB) posteriorly.
  3. Because macular fibers cross more posteriorly in the chiasm, they are damaged in posterior chiasmal syndrome. (Web site)

Optic Chiasm

  1. The optic nerves from both eyes meet and cross at the optic chiasm,[ 14][ 15] at the base of the hypothalamus of the brain. (Web site)
  2. Fibers from the medial side of each eye cross at the Optic Chiasm, to join the Optic Tract on the opposite side. (Web site)
  3. The pituitary was connected at the infundibulum, a small opening posterior to the optic chiasm that is the portal from the hypothalamus. (Web site)

Optic Nerve

  1. The optic chiasm refers to the crossing of fibers of the optic nerve, forming the optic tract, that lies on the ventral surface of the brain. (Web site)
  2. Cranial nerve II (optic nerve) joins to form the optic chiasm, in which half the fibers of each nerve cross to the opposite side.
  3. Optic Nerve The portion of the axons that originate in the ganglion cell layer of the retina that travels from the retina to the optic chiasm. (Web site)

Optic Nerves

  1. Non-secreting tumors can also cause vision problems by growing upwards and compressing the optic nerves and chiasm, nerves which are important for vision.
  2. The ventral part of the thalamus, or hypothalamus, contains at least four commissures beside the chiasm of the optic nerves.
  3. However, such tumors can often be de-bulked away from the optic nerves and chiasm, in order to protect vision.


  1. The portions of these fibres anterior to the optic chiasm are known as the optic nerves, but the sections that you're studying are posterior to the chiasm.
  2. CHIASM (OPTIC) - Crossing of visual fibers as they head toward the opposite side of the brain.
  3. A pituitary tumor typically will compress the optic nerves where they cross at the chiasm, leading to loss of peripheral vision in both eyes.


  1. Optic Nerves
  2. Science > Physics > Optics > Optic Chiasm
  3. Optic Tract
  4. Posteriorly
  5. Perception > Senses > Vision > Peripheral Vision
  6. Books about "Chiasm" in

Book: Keywen Category Structure

  Short phrases about "Chiasm"
  Originally created: April 04, 2011.
  Links checked: July 28, 2013.
  Please send us comments and questions by this Online Form
  Please click on Move Up to move good phrases up.
0.0235 sec. a=1..