Trabecula


Also found in: Dictionary, Thesaurus, Medical, Wikipedia.
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 ?
Regardless of the locations where trabeculae were lost, the process of age-related bone loss includes two steps: thinning of the trabecula and eventual loss [3, 16, 32].
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.
(2003) dentario extremadamente deprimidos trabecula corta Deficiencia Malformaciones Gapasin & de DHA operculares Duray (2001) Deficiencia Opcrculo deformado Uyan el de fosforo al.
Other topics of the 64 selected papers include the influence of loading conditions on the deformation behavior of human enamel studied by instrumented indentation, using microhardness to determine the fracture stress of ultra-high-strength ribbons, mechanical properties of the interface in heterogeneous diffusion welds on titanium and austenitic steel, a modulus mapping test to characterize the interphase in polymeric composite reinforced by carbon fiber, and verifying a numerical model for trabecular tissue using a compression test and time-lapse X-ray radiography based on a material model determined from a three-point bending test of a single trabecula.
Figures 3(a)-3(d) show that the E2 or RDE treatment could relieve the damage of the trabecula induced by the ovariectomy.
surrounded, by bundles of the apical trabecula directed crosswise, aslant and spirally in respect to the descending blood vessel.
Pulsed electromagnetic field (PEMF) therapy is reported to promote peripheral nerve regeneration, osteogenesis, and probably recovery from SCI because of increases in nicotinamide adenine dinucleotide (NAD)-specific isocitrate dehydrogenase activity, acetyl cholinesterase at the motor plate, sparing of white matter, number of motor neurons reestablishing connections [18], maturation of bone trabecula, bone volume, bone formation, and decrease in lesion volume [19-21].
James, "Morphological changes in the right ventricular septomarginal trabecula (false tendon) during maturation and ageing in the dog heart," Journal of Anatomy, vol.
Excessive load causes small repeated microfractures of the lunate trabecula leading to subsequent bony collapse.
A taxonomic review of the genera Boonea, Chrysallida, Parthenina, Ivara, fargoa, Mumiola, Odostomella and Trabecula (Gastropoda, Pyramidellidae, Odostomiinae) from Brazil.
Regions of lysis will have loss of the normal trabecular pattern, and the blastic phase will show thickening of the cortex and trabecula. (5)