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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.
2. nasal septum.
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.
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.
septum(sep'tum) plural.septa [L. saeptum, a partition]
A wall dividing two cavities. septal (-tal), adjective
atrial septumInteratrial septum
septum atriorum cordis
The septum that separates the right and left atria of the heart from the respective ventricles.
crural septumFemoral septum.
A nasal septum displaced to one side. It sometimes causes impaired air flow through a nostril.
Connective tissue that closes the femoral ring. Synonym: crural septum
The myocardial wall between the atria of the heart.
The bony partition across the alveolar process between adjacent teeth that forms part of the tooth sockets.
1. A connective tissue septum that separates two muscles, esp. one from which muscles may take their origin.
2. One of two connective tissue septa that separate the muscles of the leg into anterior, posterior, and lateral groups.
One of the thin bony partitions between the roots of a multirooted tooth that forms part of the walls of the tooth socket.
The myocardial wall between the ventricles of the heart.
A sheet of connective tissue underlying the midline groove (median sulcus) separating the halves of the tongue.
A partition between two parts of an organ or cavity.
The partition that divides the nasal cavity into two nasal fossae. The bony portion is formed by the perpendicular plate of the ethmoid bone and the vomer. The cartilaginous portion is formed by septal and vomeronasal cartilages and medial crura of greater alar cartilages. Both sides of the septum are covered with mucous membranes.
A fibrous sheet extending partially across the anterior opening of the orbit within the eyelids.
Comblike partition that separates the corpora cavernosa.
A thin, translucent, triangular sheet of nervous tissue consisting of two laminae attached to the corpus callosum above and the fornix below. It forms the medial wall and interior boundary of the lateral ventricles of the brain Synonym:
In the embryonic heart, a septum between the right and left chambers.
The layer of fascia between the rectum and the vagina.
The membranous septum between the rectum and the urinary bladder.
The partition dividing the left and right sides of the scrotum.
In the embryo, the partition that develops between the growing laryngotracheal tube (the future larynx, trachea, and lungs) and the developing esophagus.
ventricular septumInterventricular septum.
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