Trabecula

A partition which divides or partly divides a cavity: {{}}One of the strands of connective tissue projecting into an organ that constitutes part of the framework of the organ as, for example, the trabeculae of the spleen. One of a number of small interconnecting rods of bone making up a mass of spongy bone as, for example, the trabeculae within the skull. The word "trabecula" is the diminutive of the Latin "trabes", a beam or plank of wood, as might be used in a supporting structure.

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1. A meshwork; one of the supporting bundles of fibers traversing the substance of a structure, usually derived from the capsule or one of the fibrous septa. 2. A small piece of the spongy substance of bone usually interconnected with other similar pieces. 3. In histopathology, a band of neoplastic tissue two or more cells wide. [L. dim. of trabs, a beam]

- anterior chamber t. tissue at the angle of the anterior chamber through which aqueous humor exits from the eye.

- arachnoid t. [TA] fine, delicate strands composed of fibroblast and extracellular collagen that traverse the subarachnoid space between the arachnoid mater, which is attached to the dura, and the pia mater, which is adherent to the surface of the brain. SYN: trabeculae arachnoideae [TA].

- trabeculae arachnoideae [TA] SYN: arachnoid t..

- trabeculae carneae (of right and left ventricles) [TA] muscular bundles on the lining walls of the ventricles of the heart. SYN: columnae carneae, Rathke bundles, trabeculae carneae ventriculorum dextri et sinistri.

- trabeculae carneae ventriculorum dextri et sinistri SYN: trabeculae carneae (of right and left ventricles).

- trabeculae of corpora cavernosa [TA] fibromuscular bands and cords given off from the fibrous envelopes and septum of the corpora cavernosa penis and that separate the cavernous veins. SYN: trabeculae corporum cavernosorum [TA].

- trabeculae corporis spongiosi penis [TA] SYN: trabeculae of corpus spongiosum.

- trabeculae corporum cavernosorum [TA] SYN: trabeculae of corpora cavernosa.

- trabeculae of corpus spongiosum [TA] the fibrous bands interlacing between the vascular spaces of the corpus spongiosum and glans penis. SYN: trabeculae corporis spongiosi penis [TA].

- trabeculae cranii a pair of chondrification centers in the base of the embryonic cartilaginous neurocranium, lying in front of the developing hypophysis; they become the sella turcica.

- trabeculae lienis splenic trabeculae.

- trabeculae of lymph node [TA] supporting bundles of connective tissue traversing the substance of the spleen, derived from the capsule of the spleen. SYN: trabeculae nodi lymphoidei [TA].

- trabeculae nodi lymphoidei [TA] SYN: trabeculae of lymph node.

- septomarginal t. [TA] one of the trabeculae carneae in the right ventricle of the heart; it carries part of the right branch of the AV bundle from the septum to the anterior papillary muscle on the opposite wall of the ventricle. SYN: t. septomarginalis [TA], moderator band, Reil band (1).

- t. septomarginalis [TA] SYN: septomarginal t..

- trabeculae of spleen SYN: splenic trabeculae.

- splenic trabeculae [TA] small fibrous bands given off from the capsule of the spleen and constituting the framework of that organ. SYN: trabeculae splenicae [TA], trabeculae lienis, trabeculae of spleen.

- trabeculae splenicae [TA] SYN: splenic trabeculae.

- t. testis SYN: septula of testis, under septulum.

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tra·bec·u·la trə-'bek-yə-lə n, pl -lae -.lē also -las

1) a small bar, rod, bundle of fibers, or septal membrane in the framework of a bodily organ or part (as the spleen)

2) one of a pair of longitudinally directed more or less curved cartilaginous rods in the developing skull of a vertebrate that develop under the anterior part of the brain on each side of the pituitary gland and subsequently fuse with each other and with the parachordal cartilages to form the base of the cartilaginous cranium

3) any of the intersecting osseous bars occurring in cancellous bone

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n. (pl. trabeculae)

1. any of the bands of tissue that pass from the outer part of an organ to its interior, dividing it into separate chambers. For example, trabeculae occur in the penis.

2. any of the thin bars of bony tissue in spongy bone.

3. the hypertrophied bands of bladder-wall muscle that are found in bladder outflow obstruction.

• trabecular adj.

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tra·be·cu·la (trə-bekґu-lə) pl. trabeґculae [L., dim. of trabs beam, timber] a supporting or anchoring strand of connective tissue, such as one extending from a capsule into the substance of the enclosed organ. trabecular adj