When the perichondrium becomes invaded, necrosis of cartilage is liable to occur.
The reflected flaps of muco-perichondrium are replaced and maintained in position for 48 hours with plugs of cotton-wool.
The muco-perichondrium has been raised from the convex side of the septum, and the cartilage has been cut through (from A to B in Fig.
An incision is made from behind forwards along the summit of the projection, and the muco-perichondrium is turned upwards and downwards.
The muco-perichondrium is reflected for some distance round the opening so as to allow of the projecting rim of cartilage being removed.
The flap of muco-perichondrium proposed by Bönninghaus can also be much more easily manipulated.
With a small sharp elevator the muco-perichondrium is raised along the posterior edge of the incision.
The deviated septum has been divided in front, and its muco-perichondrium has been stripped up on each side.
The perichondrium should be raised with great care, for it is more easy than one would think to leave it adhering to the septum, while separating only the mucous membrane.
The perichondrium thus becomes the periosteum, and the bone produced by it, is periosteal or membrane bone.
At the same time beneath the perichondrium osteoblasts are developed which also begin to give rise to spongy bone.
Then, starting from the centre, the cartilage becomes permeated by a number of channels into which pass vessels from the perichondrium and osteoblasts.
There is now added, by extension of these processes, a thickening of the perichondrium and periosteum at the extremities of the long bones and at the junction of the ribs with the costal cartilages.
The cavities just spoken of are formed by an absorption of parts of the embryonic mucous tissue between the perichondrium and the walls of the membranous labyrinth.
This tissue has a fibrous character and becomes converted into the perichondrium and other parts.
These branchial bars are closely connected with the branchial sheet of fascia, and have no connection with the somatic fascia, their perichondrium forming part of the former sheet.
This muco-cartilage is thus described by Schneider:--The perichondrium in Ammocoetes is not confined to the true cartilaginous structures, but extends itself in the form of thin plates in definite directions.
Between these plates of perichondrium a peculiar tissue (Fig.
At each end, the intervertebral cartilages are becoming penetrated and replaced by beautiful branched processes from the homogeneous bone which was first of all formed in the perichondrium (Plate 42, fig.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "perichondrium" in a variety of sentences. We hope that you will now be able to make sentences using this word.
