Trabecula

(redirected from trabeculas)
Also found in: Dictionary, Thesaurus, Medical.

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.

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.

References in periodicals archive ?
2 mm), delgada, con pubescencia corta y pelos erectos; el dorso del mesosoma tiene pubescencia adpresa; las obreras son nodrizas que cuidan y transportan los huevos desde la camara de la reina hasta la camara de cria donde construyen la trabecula, en la cual depositan los huevos y se desarrollan las larvas y pupas; tambien son las procuradoras de alimento fuera del nido y guardias en su interior; los estados inmaduros de las obreras existen todo el ano, pues su repoblacion es continua.
9 C y D) presentan las caras laterales del centro con numerosas cavidades irregulares separadas por delgadas trabeculas de hueso.
Resultado de patologia: "Masa que al corte presenta salida de material hematico y pardo violaceo con areas amarillentas, trabeculas y cordones de celulas uniformes redondeadas con citoplasma eosinofilico y una fina red vascular de aspecto pseudopapilar con areas extensas de necrosis".
It is the process defined by Weineck as training stimulus which exploits pressure and traction actions produced by muscle activity, to stimulate a thicker cortical, that is wider, alignment of the spongiosa trabeculas in the direction of the traction and pressure lines, greater resistance of the connective tissue to traction (J.
Las trabeculas oseas subyacentes a los tejidos blandos de los dos elementos esqueleticos se van engrosando y se orientan hacia atras y hacia arriba, en direccion del crecimiento condilar.
Male group showed a great number of trabeculas and architecture more complex and strongly than female group, in this way, the bone structure of man is less submitted to the risk of osteoporotic fractures (Fig.
Los ovocitos vitelogenicos que son caracteristicos de esta fase, tienen forma de pera y miden en promedio 45-50 [micron]m, con un pedunculo que los mantiene unidos a la pared del acino, algunos acinos muy cercanos forman trabeculas, el tejido conjuntivo es escaso (Fig.
Al igual que en los mamiferos, la capsula testicular penetra en el parenquima testicular, en forma de trabeculas de tejido conectivo laminar, dividiendo a este en lobulillos (FIG.
8) De acuerdo con los autores, el MTA mostro el mejor comportamiento en cuanto a impermeabilizacion, biocompatibilidad y la estimulacion del desarrollo de nuevas trabeculas oseas, ademas de garantizar un excelente sellado marginal y tener baja citotoxicidad.
La Tomografia Computarizada (Equipo Siemen Sensation Cardiac 64 cortes) extensa tumoracion solida desde re gion cervical (C7) hasta el sacro, luego se continua en una porcion solida de 20 cm x 10 cm de diametro, todo con densidad grasa, presencia de trabeculas y distintas densidades, que capta contraste tenuemente.