interatrial septum

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Related to interatrial septum: coronary sulcus, atrioventricular 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.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

in·ter·a·tri·al sep·tum

the wall between the atria of the heart.
See also: septum primum, septum secundum.
Synonym(s): septum interatriale [TA]
Farlex Partner Medical Dictionary © Farlex 2012

in·ter·a·tri·al sep·tum

(in'tĕr-ā'trē-ăl sep'tŭm) [TA]
The wall between the atria of the heart.
Synonym(s): septum interatriale [TA] .
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
References in periodicals archive ?
Ochroch et al., "Analysis of the interatrial septum by transesophageal echocardiography in adult cardiac surgical patients: anatomic variants and correlation with patent foramen ovale," Journal of Cardiothoracic and Vascular Anesthesia, vol.
Several studies indicate that the ICNS is a complex of distinct subplexuses and that the cardiac ganglia are mainly distributed on (1) the superior surface of the right atrium, (2) the superior surface of the left atrium, (3) the posterior surface of the right atrium, (4) the posterior medial surface of the left atrium (the latter two fuse medially where they extend anteriorly into the interatrial septum), and (5) the inferior and lateral aspect of the posterior left atrium and left PVs [63, 64].
The previously noted LA mass measured 2.1 cm by 1.4 cm, appeared pedunculated and was attached to the left side of the interatrial septum with echogenic characteristics concerning for atrial myxoma (Figure 1).
Caption: Figure 1: Transesophageal echocardiography demonstrating the interatrial septum. (a) Two-dimensional transesophageal echocardiography showing a "slit-like" communication between the left and right atria, which was diagnosed as a PFO.
Interatrial septum (um)###28###21###177.92895.768###195.09546.121###P=0.453
transechocardiograph shows right atrial mass attached to interatrial septum.
In the presence of left or right atrial enlargement, the free wall enlarges while the interatrial septum is pushed relatively inferior.
Although lipomatous hypertrophy of interatrial septum has been known since 1960's, its pathophysiology is still unclear.
Small amounts of paraganglionic tissue have been described in usual sites outside the conventional distribution, such as in the interatrial septum of the heart, liver hilus, gallbladder, urinary bladder, prostatic capsule, and mesenteric vessels, (6) potentially capable of giving rise to paragangliomas in these unusual sites.
Intraoperatively, on open examination of the left atrium, it was noted that the mass originated from the fossa ovalis region of the interatrial septum and infiltrated the atrial wall down onto the entire anterior leaflet of the mitral valve.
Entrainment mapping revealed that the PPI-TCL was 28, 68, and 108 ms in the right septum, left interatrial septum, and the RA free wall, respectively.
Interatrial septum formed till day 7 with small perforations which persisted till hatching.