Where is chiasmatic sulcus?

Last Update: May 30, 2022

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sulcus prechiasmaticus [TA] a furrow on the superior surface of the sphenoid bone, located just anterior to the tuberculum sellae; it lodges the optic chiasm.

What is the Chiasmatic sulcus?

Anatomical Parts

The superior surface of the body of the sphenoid bone is bounded behind by a ridge, which forms the anterior border of a narrow, transverse groove, the chiasmatic groove (optic groove, prechiasmatic sulcus), above and behind which lies the optic chiasma of cranial nerve 2 (the optic nerve).

What is chiasmatic?

1 : an anatomical intersection or decussation — see optic chiasma. 2 : a cross-shaped configuration of paired chromatids visible in the diplotene of meiotic prophase and considered the cytological equivalent of genetic crossing-over. Other Words from chiasma. chiasmatic \ ˌkī-​əz-​ˈmat-​ik, ˌkē-​ \ adjective.

What is optic sulcus?

A depression on each side of the end of the neural ectoderm (or neural tube) of the embryo. The pit deepens to form the optic vesicle. Syn. optic sulcus.

What is a keyhole pupil?

Keyhole pupil; Iris defect. Coloboma of the iris is a hole or defect of the iris of the eye. Most colobomas are present since birth (congenital). A cat eye is a type of coloboma. Any defect in the iris that allows light to enter the eye, other than through the pupil, is called a coloboma.

Sphenoid Bone.mov

22 related questions found

What are the optic chiasm?

Listen to pronunciation. (OP-tik ky-AZ-muh) The place in the brain where some of the optic nerve fibers coming from one eye cross optic nerve fibers from the other eye. Also called optic chiasm.

What is an example of chiasmus?

What is chiasmus? ... Chiasmus is a figure of speech in which the grammar of one phrase is inverted in the following phrase, such that two key concepts from the original phrase reappear in the second phrase in inverted order. The sentence "She has all my love; my heart belongs to her," is an example of chiasmus.

How optic chiasma is formed?

The optic chiasm is an X-shaped structure formed by the crossing of the optic nerves in the brain. The optic nerve connects the brain to the eye. To biologists, the optic chiasm is thought to be a turning point in evolution.

Is the optic chiasm in the frontal lobe?

It is located at the bottom of the brain immediately inferior to the hypothalamus. The optic chiasm is found in all vertebrates, although in cyclostomes (lampreys and hagfishes), it is located within the brain.

What happens when the optic chiasm is cut?

Damage to the retina or one of the optic nerves before it reaches the chiasm results in a loss of vision that is limited to the eye of origin. In contrast, damage in the region of the optic chiasm—or more centrally—results in specific types of deficits that involve the visual fields of both eyes (Figure 12.8).

What is Tuberculum Sella?

The tuberculum sellae forms the anterior wall of the sella turcica, which houses the pituitary gland. It is an elongated ridge located immediately posterior to the chiasmatic groove, hence is related to the optic chiasm and anterior portions of the optic tracts.

What is carotid sulcus?

Anatomical terms of bone

The carotid groove is an anatomical groove in the sphenoid bone located above the attachment of each great wing of the sphenoid bone. The groove is curved like the italic letter f, and lodges the internal carotid artery and the cavernous sinus.

Where is foramen Spinosum?

The foramen spinosum (plural: foramina spinosa) is located in the posteromedial part of greater wing of sphenoid bone posterolateral to foramen ovale which connects the middle cranial fossa with the infratemporal fossa. It transmits the middle meningeal artery, middle meningeal vein, and (usually) the nervus spinosus.

Where is the middle cranial fossa?

The middle cranial fossa is a butterfly-shaped depression of the skull base, which is narrow in the middle and wider laterally. It houses the temporal lobes of the cerebrum.

What does chiasm mean?

In rhetoric, chiasmus (/kaɪˈæzməs/ ky-AZ-məs) or, less commonly, chiasm (Latin term from Greek χίασμα, "crossing", from the Greek χιάζω, chiázō, "to shape like the letter Χ"), is a "reversal of grammatical structures in successive phrases or clauses – but no repetition of words".

How is chiasm pronounced?

noun, plural chi·as·mas, chi·as·ma·ta [kahy-az-muh-tuh].

What is another name for chiasmus?

Chiasmus is the reversing of the order of words in the second of two parallel phrases or sentences. This rhetorical device is also referred to as reverse parallelism or syntactical inversion.

What is an example of Epanalepsis?

Epanalepsis (eh-puh-nuh-LEAP-siss): Figure of emphasis in which the same word or words both begin(s) and end(s) a phrase, clause, or sentence; beginning and ending a phrase or clause with the same word or words. Example: "Nothing is worse than doing nothing."

What is example of Litotes?

Litotes is a figure of speech and a form of understatement in which a sentiment is expressed ironically by negating its contrary. For example, saying "It's not the best weather today" during a hurricane would be an example of litotes, implying through ironic understatement that the weather is, in fact, horrible.

What is above the optic chiasm?

The anterior cerebral and anterior communicating arteries are anterior to the chiasm, and an internal carotid artery lies on each lateral side of the chiasm. Above the optic chiasm is the floor of the third ventricle, and approximately 1 cm below the chiasm is the pituitary gland (Figure 13-5).

What structure in the eye is responsible for the physiological 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.

Where are chiasm located?

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.