fornix


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Related to fornix: corpus callosum, Anterior commissure, Mammillary bodies

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

/for·nix/ (for´niks) pl. for´nices   [L.]
1. an archlike structure or the vaultlike space created by such a structure.
2. fornix of brain; either of a pair of arched fiber tracts that unite under the corpus callosum, so that together they comprise two columns, a body, and two crura.

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.

fornix

[fôr′niks] pl. fornices
Etymology: L, arch
an archlike structure or space, such as the fornix cerebri, the superior or inferior conjunctival fornices, or the vaginal fornices.

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.

fornix

pl. fornices [L.] an archlike structure or the vaultlike space created by such a structure.

cerebral fornix
either of a pair of arched fiber tracts that unite under the corpus callosum, so that together they comprise two columns, a body, and two crura.
conjunctival fornix
line of reflexion of the conjunctiva from the eyelid to the eyeball.
hippocampal fornix
a thick bundle of nerve fibers leaving the hippocampus to enter the hypothalamus, terminating in the mamillary body.
telencephalic fornix
see cerebral fornix (above).
vaginal fornix
the annular recess around the outside of the cervix.
References in periodicals archive ?
In the present study, difficulties were encountered placing either tear measurement device into the conjunctival fornix due to the tight eyelid conformation of the birds.
Rochester Medical expects the transaction to close in the near term, and under the terms of the Share Purchase Agreement between Rochester Medical and Fornix, be deemed retroactive to January 1, 2011.
The eye is red and injected but mainly in the lower fornix.
Whilst the viscous eye drops are instilled into the lower fornix, providing there is adequate retention, then the antibiotic would be expected to seep out and coat the marginal zone of the eyelids and even get around the bases of the eyelashes.
Swabs were placed in the posterior vaginal fornix and agitated throughout the length and circumference of subjects' vaginas before preparation for vaginal hysterectomy with or without reconstructive surgery.
They found that the uterine arteries were easy to identify, most commonly at the 3 o'clock and 9 o'clock positions, and that they averaged less than 1 cm in depth from the mucosa of the fornix vaginae, reported Susan Dickner, P.
Coitus-associated ruptures most often occurred at the posterior fornix.
Vertical laxity can be tightened 'by proxy'; ie, by inserting sutures from the inferior fornix and out to just below the lashes on the skin side.
Fornix 40 64/F/B Left frontal lobe 41 45/F/W Right parietal 42 42/M/B Pituitary 43 46/F/B Right frontal 44 70/F/W Left frontal lobe 45 84/F/W Left occipital 46 58/M/B Left brainstem 47 41/M/W Left parietal 48 49/F/W Right parietal 49 26/M/B Pituitary/optic chiasm 50 50/F/B Right frontal 51 38/M/B Right frontoparietal 52 27/F/W Right frontoparietal 53 42/F/W Pituitary 54 75/F/W Right occipital 55 77/F/W Falx 56 44/M/B Right caudate 57 43/M/W Right temporal 58 79/M/W CP angle 59 39/M/W Optic chiasm 60 22/M/W Clivus 61 34/F/W Base of brain 62 51/F/W Right frontal lobe 63 37/F/W Left frontal lobe 64 37/W/M Fourth ventricle 65 36/M/W Brainstem 66 .
He noted that a routine pelvic exam is generally performed by putting the fingers in the posterior fornix and palpating up toward the symphysis.
These include a fixed retroverted uterus, tender adnexal masses, tenderness or nodularity of the uterosacral ligaments, nodules in the rectovaginal septum, and rarely blue or red lesions in the posterior vaginal fornix.