Trabecula

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Related to trabecular: Trabecular meshwork, trabecular pattern

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 It might be outdated or ideologically biased.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 ?
The numeric value of the trabecular thickness, trabecular separation and the trabecular bone volume fraction parameters obtained in these two articular surfaces is clearly different and further reinforces the descriptive data of each type of joint (Table I).
Corticosteroids are also alleged to cause glucocorticoid receptor-mediated cross linkage of actin-filament network21 and an expression of protein myocilin in trabecular meshwork impeding aqueous outflow.22 Patients with diabetic mellitus are more prone to have higher IOP and increased prevalence of POAG and ocular hypertension.
According to World Health Organization's (WHO) classification of Endocrine Organ Tumors, HTT is described as "an uncommon tumor of follicular origin characterized by trabecular pattern of growth and marked intra-trabecular hyalinization (3).
A useful classification system to use in this scenario is to consider the following causes for this presentation: pre-trabecular (membrane growing across the angle); trabecular (clogging-up); and post-trabecular (increased resistance from elevated episcleral venous pressure) (see Table 1).
Trabecular BV of the tibia and lumbar vertebrae was decreased whereas bone resorption was increased in CIA rats.
Trabecular metal component systems (Zimmer Biomet) are reported which may have increased biocompatibility and allow enhanced bone ingrowth and fixation [10].
Caption: Figure 3: (A) Low power view of PDTC-like focus and adjacent trabecular region that does not fulfil PDTC criteria; (B) PDTC-like focus and adjacent trabecular region showing higher MIB-1 proliferation index; (C) all areas showing retained of TTF1; (D) PDTC-like focus showing loss of thyroglobulin expression and trabecular region with reduced expression.
Understanding the physiology of the trabecular cell, the active membrane components that explain its activity, the pathophysiology of trabecular dysfunction, and the role of ion channels, primarily maxi K channels, facilitate an alternative therapeutic hypotensive ocular approach for glaucoma patients [10].
The amount of decorin staining in subsinusoidal areas of tunica albuginea (SATA) and subsinusoidal areas of trabecular wall (SATW) are summarized in Table 1.
The researchers used dual-energy x-ray absorptiometry (DXA) spine scans to assess spine trabecular microarchitecture by calculating trabecular bone score (TBS) at 0, 12, 24, 30, 36, and 48 months.
There was increase in thickness of trabecular at 160 g/kg dose.