fornix


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fornix

 [for´niks] (pl. for´nices) (L.)
an anatomical archlike structure.
fornix of conjunctiva conjunctival cul-de-sac.

for·nix

, gen.

for·ni·cis

, pl.

for·ni·ces

(fōr'niks, -ni-sis, -ni-sēz), [TA] Do not confuse this word with pharynx.
1. In general, an arch-shaped structure; often the arch-shaped roof (or roof portion) of an anatomic space.
2. The compact, white fiber bundle by which the hippocampus of each cerebral hemisphere projects to the contralateral hippocampus and to the septum, anterior nucleus of the thalamus, and mammillary body. Arising from pyramidal cells of the Ammon horn, the fibers of the fornix form the alveus hippocampi and the fimbria hippocampi, and in their further course compose, sequentially, the commissure of the fornix [TA], also called the hippocampal commissure [TA] (commissura hippocampi [TA]), the crus of fornix [TA] (crus fornicis [TA]), the body of fornix [TA] (corpus fornicis [TA]), and the column of fornix [TA] (columna fornicis [TA]), which divides into a smaller portion of precommissural fibers [TA] that pass anterior to the anterior commissure to the septal area and a larger portion of postcommissural fibers [TA] that pass posterior to the anterior commissure to end mainly in the mammillary nuclei and to a lesser extent in the anterior thalamic nucleus. Synonym(s): trigonum cerebrale
Synonym(s): cerebral trigone
[L. arch, vault]

fornix

(fôr′nĭks)
n. pl. for·nices (-nĭ-sēz′)
An archlike anatomical structure or fold, such as the arched band of white matter beneath the corpus callosum of the brain.

for·nix

, gen. fornicis, pl. fornices (fōr'niks, -ni-sis, -sēz)
1. [TA] In general, an arch-shaped structure; often the arch-shaped roof (or roof portion) of an anatomic space.
2. The compact, white fiber bundle by which the hippocampus of each cerebral hemisphere projects to the contralateral hippocampus and to the septum, anterior nucleus of the thalamus, and mammillary body. Arising from pyramidal cells of Ammon's horn, the fibers of the fornix form the alveus hippocampi and the fimbria hippocampi, and in their further course compose, sequentially, the commissure of the fornix, also called the hippocampal commissure (commissura hippocampi [TA]), the crus of fornix (crus fornicis [TA]), the body of fornix (corpus fornicis [TA]), and the column of fornix (columna fornicis [TA]), which divides into a smaller portion of precommissural fibers that pass anterior to the anterior commissure to the septal area and a larger portion of postcommissural fibers that pass posterior to the anterior commissure to end mainly in the mammillary nuclei and to a lesser extent in the anterior thalamic nucleus.
[L. arch, vault]

fornix

An arch, especially one of the pair of arch-like bands of white fibres lying under the corpus callosum of the brain, or the space between the upper walls of the vagina and the neck of the womb.

conjunctiva 

A thin transparent mucous membrane lining the posterior surface of the eyelids from the eyelid margin and reflected forward onto the anterior part of the eyeball where it merges with the corneal epithelium at the limbus. It thus forms a sac, the conjunctival sac, which is open at the palpebral fissure and closed when the eyes are shut. The depths of the unextended sac are 14-16 mm superiorly and 9-11 mm inferiorly. The conjunctiva is divided into three portions: (1) The portion that lines the posterior surface of the eyelids is called the palpebral conjunctiva. It is itself composed of the marginal conjunctiva, which extends from the eyelid margin to the tarsal conjunctiva; the tarsal conjunctiva, which extends from the marginal conjunctiva to the orbital conjunctiva; and the orbital conjunctiva, which extends from the tarsal conjunctiva to the fornix. (2) That lining the eyeball is the bulbar conjunctiva. It is itself composed of the limbal conjunctiva, which is fused with the episclera at the limbus and the scleral conjunctiva, which extends from the limbal conjunctiva to the fornix. (3) The intermediate part forming the bottom of the conjunctival sac, unattached to the eyelids or the eyeball and joining the bulbar and the palpebral portion is called the fornix (conjunctival fold, cul-de-sac). See dyskeratosis; lid eversion; conjunctival gland; Krause's end bulbs; subtarsal sulcus.
References in periodicals archive ?
In one patient with suspected epistaxis in the posterior fornix of the inferior nasal meatus, bleeding could not be controlled after nasal cavity exploration and electrocautery.
The PRTT was used in its unaltered state in this study, and because of the design of a much thinner filamentous thread, it was generally easier to secure in the conjunctival fornix with a small ophthalmic forceps.
However, the relationship between being overweight in mid-life and brain health - especially in relationship to white matter connections such as the fornix - is not well understood.
3D reconstructions were performed of the fiber structures of the fornix and the cingulum and the parahippocampal gyrus for all 31 subjects.
The cingulum and the body and pillars of the fornix were identified by the Fiber Assignment by Continuous Tracking method implemented through DtiStudio version 2.40 (http://www.mristudio.org) [36].
Postoperative drain was kept in posterior fornix for 4 days.
Among the fiber tracts that are evident in the normal fetal brain are the corpus callosum; the fimbria, a band of white matter along the edge of the hippocampus; the fornix, a bundle of fibers that connects the hippocampus on either side of the brain and then projects down and back toward the thalamus; and the fasciculus retroflexus, which consists of major output fibers of the forebrain.
23 August 2010 - The upgraded 2010 sales forecast of Danish immunotherapy company ALK-Abello A/S (CPH: ALK B) is mainly due to the acquisition of the allergy division of Dutch firm Fornix Biosciences NV (AMS: FORBI), according to ALK-Abello's CEO Jens Bager.
The size of the nodule may be palpated on bimanual exam and can involve uterosacral ligaments, the posterior vaginal wall, the anterior rectal wall, and the posterior fornix.
Anatomically speaking, this area is the fornix, the area of the vagina into which the cervix protrudes.
Through a subtarsal incision conjunctiva was dissected from the underlying lower lid retractor layer, until the inferior fornix. The lower lid retractor layer was separated from the lower border of the tarsal plate.