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Subjects which continue somewhat lame, because of complete ossification of both cartilages, are best put to slow work on soft ground and not driven on pavements. Navicular Disease. This more or less ambiguous term has been applied to various diseases affecting the structures which make up the coffin joint. Etiology and Occurrence.
Many of the physiological researches begun by him were carried on and perfected by his more famous brother, particularly his investigations of the capillaries, but he added much to the anatomical knowledge of several structures of the body, notably as to the structure of cartilages and joints.
They are connected in pairs with the dorsal vertebræ behind. The first seven pairs, counting from the neck, are called the true ribs, and are joined by their own special cartilages directly to the breastbone.
Another has discovered a startling effect which a certain action of the arytenoid cartilages has on registers, and sees a perfect voice as the result. Another has discovered that a particular movement of the thyroid cartilage is the only proper way to tense the vocal cords and when every one learns to do this all bad voices will disappear.
A special set of muscles draws the arytenoid cartilages toward each other, thereby bringing their edges very near and parallel to each other in the passage. At the same time other muscles act on the thyroid and cricoid cartilages to separate them at the top and give the cords the necessary tension.
It is by no means unlikely that this was the result of his first trying to attract her attention. The eye impression moving to the ear in a new and strange way, there is perhaps a stirring and dragging of the cartilages. That Mr. Godfrey's friend appeared in response and spoke to him, and referred back to some joint conversation, is curious.
It was connected to the pubis by a short stem 1/2 inch long and as large as the little finger, consisting of separate bones and cartilages. There was a patella in the supernumerary limb on the anal aspect, and a joint freely movable. This compound limb had no power of motion, but was endowed with sensibility.
In the median line, corresponding to the absence of sternum, was a longitudinal groove bounded on either side by a continuous hard ridge which articulated with the costal cartilages. The skin passed naturally over the chest from one side to another, but was raised at one part of the groove by a pulsatile swelling which occupied the position of the right auricle.
Showing the parts indicated above; and of these the crico-thyroid muscle is to be especially observed. It is important to remember the relative position of parts and to bear in mind that most of the laryngeal structures are in pairs. To this last statement the thyroid and cricoid cartilages and the epiglottis are exceptions, being single.
They have the general appearance of ridge-like projections from the sides of the larynx, but at their edges they are sharp and smooth. The open space between the cords is called the glottis. When sound is not being produced, the glottis is open and has a triangular form, due to the spreading apart of the arytenoid cartilages and the attached cords.
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