septum pellucidum


Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia.
Related to septum pellucidum: caudate nucleus, Cavum septum pellucidum

septum

 [sep´tum] (L.)
1. a wall or partition dividing a body space or cavity. Some are membranous, some are osseous, and some are cartilaginous; each is named according to its location. See also septal defect. adj., adj sep´tal.
alveolar septum interalveolar septum.
atrial septum (septum atrio´rum cor´dis) interatrial septum.
atrioventricular septum the part of the membranous portion of the interventricular septum between the left ventricle and the right atrium.
deviated septum an injury or malformation of the nasal septum so that one part of the nasal cavity is smaller than the other; this is fairly common and seldom causes complications. Occasionally the deviation may handicap breathing, block the normal flow of mucus from the sinuses during a cold, or prevent proper drainage of infected sinuses. In some cases surgery (called partial or complete submucous resection) may be necessary to relieve the obstruction and reduce irritation and infection in the nose and sinuses.
interalveolar septum
1. one of the thin plates of bone separating the alveoli of the teeth in the mandible and maxilla. Called also interradicular septum.
2. one of the thin septa that separate adjacent pulmonary alveoli, containing connective tissue and the capillary network of the blood supply of the lung. Defs. 1 and 2 called also alveolar septum.
interatrial septum (septum interatria´le cor´dis) the partition separating the right and left atria of the heart; called also atrial septum.
interradicular septum interalveolar septum (def. 1).
interventricular septum (septum interventricula´re cor´dis) the partition separating the right and left ventricles of the heart; called also ventricular septum.
nasal septum a plate of bone and cartilage covered with mucous membrane that divides the nasal cavity.
septum lu´cidum septum pellucidum.
pellucid septum (septum pellu´cidum) the triangular double membrane separating the anterior horns of the lateral ventricles of the brain; called also septum lucidum.
septum pri´mum a septum in the embryonic heart, dividing the primitive atrium into right and left chambers. See also congenital heart defect.
rectovaginal septum the membranous partition between the rectum and vagina.
rectovesical septum a membranous partition separating the rectum from the prostate and urinary bladder.
septum of ventricles of heart (ventricular septum) (septum ventriculo´rum cor´dis) interventricular septum.

sep·tum pel·lu·'ci·dum

[TA]
a thin plate of brain tissue, containing nerve cells and fibers, that is stretched like a flat, vertical sheet between the column and body of fornix below, and the corpus callosum above and anteriorly; it is usually fused in the median plane with its partner on the opposite side so as to form a thin, median partition between the left and right frontal horn of the lateral ventricles; in fewer than 10% of humans there is a blind, slitlike, fluid-filled space between the two transparent septa, the cavity of septum pellucidum. The transparent septum is continuous ventrad through the interval between the corpus callosum and the anterior commissure with the precommissural septum and subcallosal gyrus.
See also: cavity of septum pellucidum, septal area.

septum pellucidum

(pə-lo͞o′sĭ-dəm)
n. pl. septa pellucida (-də)
A thin membrane of nervous tissue that forms the medial wall of the lateral ventricles in the brain.

septum pellucidum

sep·tum pel·lu·ci·dum

(sep'tŭm pe-lū'si-dŭm) [TA]
A thin plate of brain tissue, containing nerve cells and fibers, that is stretched like a flat, vertical sheet between the column and body of fornix below, and the corpus callosum above and anteriorly.
References in periodicals archive ?
Congenital and acquired lesions of the septum pellucidum.
Increased prevalence of the cavum septum pellucidum in magnetic resonance scans and post-mortem brains of schizophrenic patients.
Increased prevalence of cavum septum pellucidum in schizophrenia.
The abnormal superior location of the third ventricle (between the lateral ventricles) can inhibit the correct diagnosis from being made if cautious interrogation to differentiate this structure from the cavum septum pellucidum is not performed.
The radial projection of the sulci, absence of the corpus callosum and cavum septum pellucidum, and colpocephaly are all sonographic signs of ACC.
The corpus callosum was absent anteriorly and the septum pellucidum was absent in entirety.
The association of optic-nerve hypoplasia with absence of the corpus callosum and septum pellucidum combined with pituitary hormone deficiency is known as Septo-Optic Dysplasia (SOD), or the Syndrome of de Morsier.
Other less common locations reported include the third ventricle, septum pellucidum, intraparenchymal, or in the spinal cord.
1, 5, 9, 11-12) A review of symptomatic subependymomas concluded that larger tumors in the region on septum pellucidum can cause intracranial hypertension with headache, vomiting, and altered sensorium.
The septum pellucidum is absent or nearly completely absent in 70%-90% of affected patients.
5 cm in diameter, was attached to the left side of the septum pellucidum at the level of the foramina of Monro (Figure, B).
The ventricular system was partially collapsed, but there was no deviation of the septum pellucidum or third ventricle.