Trabecula


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Related to Trabecula: Septomarginal trabecula

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 ?
They showed in most of the cases the septomarginal trabecula originated about upper or middle third of the ventricular wall.
With increasing strain, the crack started to grow inside the trabecula along horizontal direction, until complete fracture of the trabecular bone structure occurred.
The interorbital septum has increased in height and appears continuously with the trabecula communis and extends into the ethmoidal region of the chondrocranium shaping of the nasal septum.
Por lo tanto, despues de destruir la estructura y la trabecula durante la recolecta, es necesario rellenar el nido para restablecer su temperatura y humedad.
La medula osea es un tejido graso y suave que yace al interior del hueso trabecular, y son en conjunto la trabecula y el estroma de la medula osea los elementos que fisicamente soportan y fisiologicamente mantienen el tejido hematopoyetico (12).
Other growth patterns include small clusters or trabecula separated by a variable amount of fibrous or myxoid stroma.
Una trabecula septomarginal se extendia entre los musculos papilares subarterioso y magnus.
In glaucoma, the trabecula that usually drains fluid from the eye can close, causing a buildup of fluid and pressure of that fluid that then damages the optic nerve.
This results in a unique alternating pattern of decreased bone density and increased thickening of trabecula visible on dental radiographs.