It consists of a short deeply biconcave =centrum= whose two cavities communicate by a narrow central canal.
In Gymnophiona the vertebrae arebiconcave and are very numerous, they sometimes number about two hundred and thirty.
The vertebrae may be solid or their centra may be hollowed internally; their surfaces may be flat, biconcave or opisthocoelous.
The vertebrae are biconcave and are very numerous; very few however belong to the tail.
In Labyrinthodontia the centra of the vertebrae are generally well ossified biconcave discs.
With rare exceptions their shape is that of a biconcave disk with bevelled edges, the size varying somewhat in different animals, as is seen in the following table which gives their diameters:-- Man 0.
In the mammal they are biconcave disks with bevelled edges, they do not contain a nucleus so that they are not cells.
A group of fossil saurians having biconcave vertebr\'91 and the teeth implanted in sockets.
These reptiles are related to the crocodiles, but have biconcave vertebr\'91.
They had biconcave vertebr\'91, ambulatory limbs, and a well-developed pelvis and shoulder girdle.
An order of reptiles having biconcave vertebr\'91, immovable quadrate bones, and many other peculiar osteological characters.
It is remarkable for havingbiconcave vertebr\'91, and sharp, conical teeth set in sockets.
It is remarkable for having biconcave vertebræ, and sharp, conical teeth set in sockets.
Labyrinthodonta, with simple biconcave vertebral disks, very slightly pierced by a remnant of the notochord and supporting the loosely articulated neural arch.
Defn: A group of fossil saurians havingbiconcave vertebræ and the teeth implanted in sockets.
It is remarkable for having biconcave vertebræ, and sharp, conical teeth set in sockets.
Note: They had biconcave vertebræ, ambulatory limbs, and a well- developed pelvis and shoulder girdle.
These reptiles are related to the crocodiles, but have biconcave vertebræ.
Defn: An order of reptiles having biconcave vertebræ, immovable quadrate bones, and many other peculiar osteological characters.
At a period before this thickening has attained considerable dimensions the notochord becomes sufficiently constricted in the centre of each vertebral region to give a biconcave form to the vertebrae for a very short period of foetal life.
The stage withbiconcave vertebrae is retained through life in the Perennibranchiata and Gymnophiona.
Owing to the beaded structure of the notochord the vertebral bodies take of necessity a biconcave hourglass-shaped form.
The primitive biconcave vertebrae of the fish and of the early land vertebrates were retained, and the limbs degenerated into short paddles.
A more reptilian character in the Ichthyornis group is the fact that, unlike any modern bird, but like their reptile ancestors, they had biconcave vertebrae.
The Ichthyornis type was a tern-like flying bird, with socketed teeth and biconcave vertebrae like the reptile, but otherwise fully evolved into a bird.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "biconcave" in a variety of sentences. We hope that you will now be able to make sentences using this word.
