Bony Shell Fontanelles At the time of hatching, fontanelles remain where bones of the shell have not yet articulated with their neighbors.
The remaining costoperipheral fontanelles close in varying sequence but those in the area of the bridge (nos.
Extent of closure of the costoperipheral fontanelles in relation to length of plastron in 17 skeletons of T.
In general, the fontanelles of the shell are closed by the time sexual maturity is attained, but some remain open a year or two longer.
The meager covering of thefontanelles makes juvenal turtles more susceptible than adults to many kinds of injuries and to predation.
The costoneural fontanelles are nearly closed in individuals of the 70 millimeter (plastron length) class and seldom remain open after a length of 80 millimeters is attained (Fig.
Fontanelles of the bony shell close at or before puberty.
The fontanelles of the shell are classified as follows (see Figs.
The plastral fontanelles are closed in most specimens of the 90 millimeter (plastron length) class; the anteromedian fontanelle closes first.
The fontanelles probably are present in some larger individuals.
As growth proceeds, the single, transversely-oriented, fontanelle of young turtles that separates the nuchal from the first neural and first pair of pleurals divides into two fontanelles that generally decrease in size and finally disappear.
They cover the posterior fontanelles and stretch over from the sphenotic to the lateral ethmoid, forming a roof for the orbit.
The cranium remains to a great extent unossified, and large dorsal and ventral fontanelles pierce its walls.
They cover over the fontanelles and overlap the sphenethmoid in front.
A, 9), and two smaller posterior fontanelles (fig.
The child weighed 10 1/2 pounds and had a large head in a remarkably advanced stage of ossification, with the fontanelles nearly closed.
There are cases on record in which the fontanelleshave remained open until adulthood.
Ossification of the fontanelles in a mature infant would necessarily prevent full development of the brain.
As the rotation becomes complete the neck straightens, so that the two fontanelles are again found on the same level.
It will be seen here that the neck is straightened out, and that the two fontanelles are on a line with each other.
By referring to Plate XXIV, the shape and position of the Fontanelles will be seen, and if the head be supposed placed with the top downwards, and the back of it to the mother's left side, they may be readily found with the finger.
Sometimes the bones will be very perfectly formed, and the fontanelles nearly filled up, before birth, and then the head cannot be crushed much smaller, and so the labor becomes both painful and difficult.
The blades should always, if possible, be applied one on each side of the head, the position of which must be determined by the direction of the fontanelles and sutures, not by feeling for the ear, as is usually recommended in this country.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "fontanelles" in a variety of sentences. We hope that you will now be able to make sentences using this word.
