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Updated: June 23, 2025
The ox, like the horse, has a membrane of semilunar form in the inner corner of the eye, which is capable of being thrown over the entire eyeball, for the purpose of cleansing the eye from any foreign substance which may get into it. This membrane is commonly called the haw, and is susceptible of attacks of inflammation, which cause it to swell, frequently even closing up the eye. Treatment.
They are tapering or peg-shaped, and present at their cutting margin a deep semilunar notch. These appearances are commonly associated with the name of Hutchinson, who first described them. Affecting as they do the permanent teeth, they are not available for diagnosis until the child is over eight years of age.
In an irregularly acting heart the systolic pressure may vary greatly, from 10 to 20 mm. or more, and a ventricular contraction may not be of sufficient power to open the semilunar valves. Such beats will show an intermittency in the blood pressure reading as well as in the radial pulse.
The muscular substance of the heart itself is supplied with nourishment by two little arteries called the coronary arteries, which start from the aorta just above two of the semilunar valves. The longest route a portion of blood may take from the moment it leaves the left ventricle to the moment it returns to it, is through the portal circulation.
All the cavities of the heart are lined with a smooth, delicate membrane, called the endocardium. Semilunar valves. 2. Tricuspid valve. 3. Mitral valve. 4. Right auricle. 5. Left auricle. 6. Right ventricle. 7. Left ventricle. 8. Chordæ tendineæ. 9. Inferior vena cava. 10. Superior vena cava. 11. Pulmonary artery. 12. Aorta. 13. Pulmonary veins.
As soon as the left ventricle is full, it contracts. The mitral valve instantly closes and blocks the passage backward into the auricle; the blood, having no other way open, is forced through the semilunar valves into the aorta. Now red in color from its fresh oxygen, and laden with nutritive materials, it is distributed by the arteries to the various tissues of the body.
All the blood flows continuously through both circulations and passes the various parts in the following order: right auricle, tricuspid valve, right ventricle, right semilunar valve, pulmonary artery and its branches, capillaries of the lungs, pulmonary veins, left auricle, mitral valve, left ventricle, left semilunar valve, aorta and its branches, systemic capillaries, the smaller veins, superior and inferior venæ cavæ, and then again into the right auricle.
There are, as everyone knows, three sigmoid or semilunar valves situated at the orifice of the pulmonary artery, which effectually prevent the blood sent into the vessel from returning into the cavity of the heart.
Oh no! but what dull ache is this in that obscurely sensitive region, somewhere below the heart, where the nervous centre called the semilunar ganglion lies unconscious of itself until a great grief or a mastering anxiety reaches it through all the non-conductors which isolate it from ordinary impressions?
This day also we caught two bonetoes, which were most welcome, as they made a hearty meal to our whole company. This fish is commonly about three feet long and two in circumference, having a very sharp head, with a small mouth, full eyes, and a semilunar tail. It is very fleshy, and makes good broth.
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