anterior optic chiasm [TA] One groove on the upper surface of the sphenoid boneanterior to the tuberosity sellae; it houses the optic chiasm.

What is a cross groove?

anatomical site

Behind the upper surface of the sphenoid body is a ridge that forms the anterior edge of a narrow transverse groove, the cruciate groove (view grooveanterior optic chiasm), above and behind it is the optic chiasm of the 2nd cranial nerve (optic nerve).

What is a crossover?

1: anatomical cross or discussion — See optic chiasm. Figure 2: The cruciform configuration of paired chromatids seen in meiotic prophase diploids and considered the cytological equivalent of genetic exchange. Other words from chiasma. chiasmatic \ ˌkī- əz- ˈmat- ik, ˌkē- \ Adjective.

What is the optic groove?

A depression on each side of the neuroectoderm end embryo (or neural tube). The pits deepen to form optic vesicles. Synchronize. visual groove.

What is a keyhole pupil?

Keyhole pupil; iris defect.iris defect is A hole or defect in the iris of the eye. Most defects are present from birth (congenital). A cat’s eye is a defect. Any defect in the iris that allows light to enter the eye, rather than through the pupil, is called a defect.

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22 related questions found

What is the optic chiasm?

Listen to pronunciation. (OP-tik ky-AZ-muh) Where in the brain some optic nerve fibers from one eye cross with those from the other eye. Also known as the optic chiasm.

What is an example of intersection?

What is interleaving? … Chiasmus is a figure of speech in which the grammar of one phrase is reversed in the following phrase, so that the two key concepts in the original phrase reappear in the second phrase in reverse order.This sentence « She has all my love; my heart belongs to her » is an example of interleaving.

How is the optic chiasm formed?

The optic chiasm is an X-shaped structure formed through the optic chiasm in the brain. The optic nerve connects the brain and eyes. For biologists, the optic chiasm is considered an evolutionary turning point.

Does the frontal lobe have an optic chiasm?

It is located Immediately at the base of the brain, adjacent to the hypothalamusThe optic chiasm is present in all vertebrates, although in ring-mouthed animals (lampreys and hagfish) it is located within the brain.

What happens when the optic chiasm is severed?

Damage to the retina or one of the optic nerves before reaching the optic chiasm can cause Vision loss limited to the primary eyeIn contrast, damage to the chiasm or more central region results in a specific type of defect involving both binocular visual fields (Fig. 12.8).

What is sella tuberculosis?

saddle nodule formation Anterior wall of sella, which houses the pituitary gland. It is an elongated ridge that is located just behind the optic chiasm and is therefore related to the optic chiasm and the front of the optic tract.

What is a carotid sulcus?

Anatomical Terms for Bones

The carotid groove is Anatomical grooves in the sphenoid bone, above the attachment points of each of the greater wings of the sphenoid bone. The groove is curved like an italic letter f and accommodates the internal carotid artery and cavernous sinus.

Where is the foramen thorn?

The foramen spinosa (plural: foramina spinosa) is located in posterolateral to the posterolateral foramen ovale on the posteromedial foramen ovale of the greater wing of the sphenoid bone It connects the middle cranial fossa and the infratemporal fossa. It transmits the middle meningeal artery, the middle meningeal vein, and (usually) the spinous nerve.

Where is the middle cranial fossa?

middle cranial fossa is Butterfly-shaped depression at the base of the skull, narrower in the middle and wider in the horizontal direction. It houses the temporal lobe of the brain.

What does cross mean?

In rhetoric, chiasmus (/kaɪˈæzməs/ ky-AZ-məs) or the less common chiasm (Latin from Greek χίασμα, « cross », from Greek χιάζω, chiázō, « shaped like the letter Χ ») is « Reverse grammatical structure in consecutive phrases or clauses – but without repeating words ».

How to pronounce cross?

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

What is another name for chiasmus?

Intersection is the reversal of the order of the second word in two parallel phrases or sentences.This rhetorical device is also known as Inverse parallelism or syntactic inversion.

What is an example of Epanalepsis?

Epanalepsis (eh-puh-nuh-LEAP-siss): Emphasis diagram in which the same word or words simultaneously begin and end a phrase, clause, or sentence; begin and end a phrase or clause with the same word or words. example: « There is nothing worse than doing nothing.« 

What is an example of Litotes?

Litotes are a figure of speech and a form of understatement in which an emotion is ironically expressed by negating the opposite emotion.for example ‘It wasn’t the best weather today’ during a hurricane would be an example of litotes, implying through ironic understatement that the weather is actually dire.

What is above the optic chiasm?

The anterior cerebral arteries and the anterior communicating arteries are located anterior to the intersection, and the internal carotid arteries are located on each side of the intersection.Above the optic chiasm is third ventricle floorabout 1 cm below the intersection is the pituitary gland (Figure 13-5).

What structures in the eye are responsible for the physiological blind spot?

Blind spot, a small portion of each eye’s field of view that corresponds to the location of the eye The optic disc (also called the optic nerve head) within the retina. There are no photoreceptors (i.e. rods or cones) in the optic disc, so there is no image detection in this area.

Where is the cross?

The optic chiasm is located at At the junction of the anterior wall and bottom of the third ventricle. The anterior cerebral arteries and the anterior communicating arteries, the endplates, and the third ventricle are located above the optic chiasm.