The trabeculae are usually somewhat lyre-shaped, meeting in front and behind, and leaving a large pituitary space between their middle parts.
From this evidence it is easy to see that that portion of the basi-cranial skeleton known as the trabeculae may have originated from the formation of cartilage in the plastron or entosternite of a palaeostracan animal.
I entirely agree with Schimkewitsch that the nests of cartilage-cells are much more extensive in, and indeed nearly entirely confined to, these two lateral trabeculae in the entosternite of Hypoctonus.
In the majority of the lower forms the trabeculae arise quite independently of the parachordals, though the two sets of elements soon unite.
The prosomatic skeleton of Ammocoetes; the trabeculae and parachordals, their structure, their origin in white fibrous tissue.
It is separated at first entirely from the sub-chordal portion of the branchial basket-work, and is composed of a foremost part, the trabeculae (Tr.
The trabeculae are usually somewhat lyre-shaped, meeting in front and behind, and leaving a large pituitary space between their middle parts (figs.
By some anatomists the trabeculae have been held to be a pair of branchial bars; but this view has now been generally given up.
Mammals the parachordals and trabeculae are formed as a continuous whole.
The junction between the trabeculaeand parachordals becomes marked by a cartilaginous ridge known as the posterior clinoid.
These and other processes growing out from the trabeculae have occasionally been regarded as rudimentary praeoral branchial arches.
The trabeculae are covered by a more or less columnar uterine epithelium (e'), and are in contact on every side with foetal villi.
In these spaces they partly float freely, and partly are attached to delicate trabeculae of the maternal tissue (fig.
The trabeculae soon unite together both in front and behind and form a complete plate underneath the fore-brain, and extending into the nasal region[204].
The region of the trabeculaein front of the brain is the ethmoid region.
In Man (Koelliker) the trabeculaeform from the first a continuous plate in front of the pituitary space, and the latter very early acquires a cartilaginous floor.
These two layers form together the epithelioid lining of the heart; between them is the cavity of the heart, which soon loses the protoplasmic trabeculae which at first traverse it.
In Lampreys the trabeculae grow forwards and send up plates of cartilage which meet above (fig.
In this way the centre of the developing shaft becomes converted into a mass of cavities separated by bands or trabeculae of cartilage.
The bony trabeculae and the cortex are destroyed only secondarily.
It causes a thinning of the cortex of the shafts and of the trabeculae of the spongy portions of the long and short bones.
The trabeculae of the germinal epithelium form the egg-tubes of Pflueger.
The stroma grows into the germinal epithelium while it is still formed of rounded indifferent cells, and divides it into trabeculae as described above.
In many secondary corals (Cyclolites, Thamnastraea) the trabeculae are so far separate that the individual bars are easily recognizable, and each looks something like a bamboo owing to the thickening of the two ends of each node.
Further, the trabeculae may be evenly spaced throughout the septum, or may be grouped together, and this feature is probably of value in estimating the affinities of corals.
The trabeculae are united together by these thickened internodes, and the result is a fenestrated septum, which in older septa may become solid and aporose by continual deposit of calcite in the fenestrae.
The aporose corals, too, have a practically identical structure, their compactness being due to the union of the trabeculae throughout their entire lengths instead of at intervals, as in the Perforata.
The septa of modern perforate corals are shown to have a structure nearly identical with that of the secondary forms, but the trabeculae and their nodes are only apparent on microscopical examination.
Sheet 14, shows a dorsal view of a young tadpole cranium; the brain has been removed, and it is seen that it was supported simply upon two cartilaginous rods, the trabeculae cranii (tr.
A few liver trabeculae are to be seen on either side of the portal, but they show no lumena, and may be traced through only a few sections.
This cavity is a part of the system of hollow liver trabeculae seen as a group of irregular masses of cells ventrad to the enteron at the opening of the anterior intestinal portal.
It is obvious that according to the above view Pflueger's egg-tubes are merely trabeculae of germinal epithelium, and have no such importance as has been attributed to them.
These two layers form the epithelioid lining of the heart; between them is the cavity of the heart, which soon loses the protoplasmic trabeculae which at first traverse it.
These membranes closely resemble and sometimes are even continuous with trabeculae which traverse the germinal epithelium.
The pseudo-epithelium is separated from the middle layer by a more or less complete stratum of connective tissue, which, however, is traversed by trabeculae connecting the two layers of the epithelium.
Immediately below the pseudo-epithelium, there is an imperfectly developed fibrous layer, forming a kind of tunic, in which are imbedded the relatively reduced epithelial trabeculae of the previous stages.
This primary skull extended in front of the notochord (the spinal cord of the human embryo, and the permanent spinal cord of the lancelet), where it gave off two trabeculae cranii or front skull plates.
The trabeculae are usually about half the normal length and have a truncated appearance.
The osseous trabeculae are fewer in number and those which remain are slender and irregular, and frequently appear as isolated islets.
The trabeculae are so thin and reduced in number that the bone has become a very fragile structure.
Everything in a state of disorder--trabeculae of bone of various shapes and sizes lie scattered about, the cells irregularly arranged and much distorted, signs of recent hemorrhage, unrecognizable detritus.
Another feature which strikes one at first glance is that the entire marrow area is incompletely filled by the thin and greatly-depleted trabeculae of the spongiosa.
The bone trabeculae on which they abut are not well formed or of equal length, and do not present an even and transverse plane, but are misshapen, small, so that the line of junction with the cartilage is zigzag.
The junction is deformed, and the rows are very disorganized; the trabeculae have disappeared and an ossified band extends across the junction.
It is composed of a loosely-constructed fibrillar tissue on a gelatinous-appearing groundwork, of sparsely scattered cells, and bonytrabeculae which are markedly thin and weak.
The originally separate parachordals and trabeculae become connected to form a trough-like, primitive cranium, complete or nearly so laterally and ventrally but open dorsally.
It seems highly probable that the more deeply seated osseous elements occurring in these as in the higher groups arose in the course of evolution by the spreading inwards of bony trabeculae from the bases of the placoid elements.
In the former the large meshes of the lattice-work are usually subregular and triangular, in the latter polygonal; the trabeculae are hollow cylinders, filled with jelly, and containing usually a central axial thread.
In all these cases, however, the tubes are direct processes of the cavity of the shell, the trabeculae of the lattice-work being solid.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "trabeculae" in a variety of sentences. We hope that you will now be able to make sentences using this word.
