Trabecula

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trabecula

[trə′bek·yə·lə]
(anatomy)
A band of fibrous or muscular tissue extending from the capsule or wall into the interior of an organ.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Trabecula

 

(1) In reference to vertebrates, including man, the word “trabecula” has several meanings. The trabeculae cra-nii, in the cranium of the embryo, are two cartilaginous bars anterior to the notochord, under the base of the forebrain. The part of the cranium that develops from the trabeculae is called prechordal, as distinct from the parachordal part of the cranium, which lies behind the end of the notochord and which bears traces of segmentation. The trabeculae occupy the orbital region of the cranium and lie horizontally or in flexed position, depending on the flexure of the rudimentary brain. As the cranium develops, the trabeculae fuse with each other and with the parachordal part of the cranium, forming its base. Anterior to the developing trabeculae are attached the cartilaginous nasal capsules. On the sides are the auditory vesicles.

The word “trabeculae” is also used to denote the septa that depart from the external capsule of connective tissue and project into the lymph nodes and spleen, forming the stroma of those organs; blood vessels pass through the trabeculae.

The word also denotes supporting structures in the spongy substance of the bone.

(2) In reference to invertebrates, the word is also used in several senses. In ascidians, the trabeculae are slender cords that unite the outer wall of the peribranchial cavity with the pharynx and provide support. In gastropods, they are folds that project into the kidneys. In arachnids, they are bands of connective tissue between the leaflike folds of the lung book; they prevent the leaves from collapsing and thus facilitate blood circulation.

(3) In plants, the trabeculae are incomplete transverse septa in the sporangia of certain plants, for example, the genera Pleuromeia, Lepidodendron, and Isoetes. The word is used to denote the elongated cells of the endoderm in the trunks of Selaginella; the trabeculae suspend the stele in the air cavity. In addition, trabeculae are transverse thickenings on the peristome teeth along the margins of the spore-bearing capsule of certain mosses.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
LVNC is a rare cardiomyopathy that is characterized by the presence of a trabeculated myocardium layer, with deep inter-trabecular recesses adherent to a thin compact layer of myocardium resulting in severe left ventricular dysfunction.1The etiology of LVNC is assumed to be due to errors in embryonic development.1 First described on echocardiography in 1984 by Engberding and Bender as the persistence of isolated myocardial sinusoids.
proposed that the trabeculated mass be taken into consideration when they found that the percentage of trabeculated mass was three times higher in patients with LVNC compared to other groups including controls [28].
The myocytes formed a dense layer which was highly trabeculated in the lumen side may be responsible for ventricular growth [26].
A trabeculated and/or thick bladder wall on ultrasonography may be an indirect finding of an excessively active bladder.
X-ray of the involved bone in all the patients showed typical expansile lytic lesions and some lesions with trabeculated area of radiolucency with or without ground glass appearance (Fig.
Its outer surface was smooth, and its inner surface had a trabeculated appearance.
1, 2): dilated and globally hypokinetic left ventricle (LV) (ejection fraction-38%), prominent trabecularization of the apex and the mid-lateral wall, deep intertrabecular recesses with flow coming out from ventricular cavity; the end-systolic thickness ratio between noncompacted and compacted myocardium was 2.5; the apex of the right ventricle was hypokinetic and heavily trabeculated, with evident flow in intertrabecular recesses.
Using electron microscopy, the anatomy of the subdural space was observed by Reina et al (16), wherein the arachnoid mater had an outer compact laminar portion attached to the inside of the dural sac and a separate inner trabeculated portion.
Radiographically, the lesion may present as a well-defined expansible unilocular or complex multilocular radiolucent area with a trabeculated appearance.
Bones generally unidentified, without cortical layer (only trabeculated, spongy bone).
The arrangement of the muscle layer was markedly distorted in some areas giving a trabeculated appearance (Fig.
Characteristic findings on VCUG include a dilated, thick-walled, trabeculated bladder and an elongated dilated prostatic urethra with a relatively narrowed bladder neck.