Conch of extreme size; extending from the level of the forehead over the eye to the chin in a semilunar form, with an anterior semicircular flap in its whole length, the aperture large, of a rhomboidal form.
The integuments on the fore part are then dissected upwards a little, by a few touches of the knife, so as to form a small semilunar flap; at this part of the operation there is no necessity for laying down the knife and using a bistoury.
A semilunar incision may then be made along the base of the jaw, the horns of the incision pointing upwards and passing over the space which was occupied by the extracted teeth.
In muscular subjects two semilunar flaps had better be made, one from the anterior aspect of the limb, the other from the posterior, the muscles being cut short in the ham, and the incision made to reach the popliteal artery.
Inner cortical shell lentelliptical, one and a half times as long as broad, with smooth surface and foursemilunar gates.
Transverse girdle of the outer cortical shell with two smooth semilunar wings, with convex, smooth lateral crests; each wing as broad as the transverse girdle of the inner cortical shell and twice as long as its lateral girdle.
Pulmonary semilunar valves guard the orifice of the pulmonary artery, keeping the blood from flowing back into the right ventricle.
The semilunar valves surround the opening from the left ventricle into the aorta and keep the blood from flowing back.
On the commencement of the diastole of the ventricle, the semilunar valves are closed, and the aorta recoils by its elasticity so as to force part of its contents into the vessels farther onwards.
In a typical Mammal the external semilunar cartilage is attached by its posterior horn to the internal condyle of the femur only, and this explains the ligament of Wrisberg already mentioned.
The semilunar cartilages first appear in the Amphibia, and, according to B.
The semilunar valves (20) prevent the reflow of blood from the aorta to the left ventricle.
They are generally composed of two semilunar folds, one on each side of the vessel.
A, A, A, The semilunar ganglion and solar plexus, situated below the diaphragm and behind the stomach.
The semilunar valves (18) prevent the blood passing from the pulmonary artery to the right ventricle.
The thoracic duct is equal in diameter to a goose-quill, and, at its termination, is provided with a pair of semilunar valves, which prevent the admission of venous blood into its cylinder.
The semilunar valves (9) prevent this circulating fluid returning to the ventricle.
There is included in this collection a brief treatise on the heart; and in this occurs the earliest known account of the structure and use of the semilunar valves, which together with the rest of the cardiac valves were unknown to Aristotle.
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.
The bailey of Shrewsbury Castle is roughly semilunar and covers nearly an acre.
A lofty motte, with a very small semilunar platform below, formed by broadening out a part of the counterscarp bank of the ditch.
There is still a high oval motte, having a ditch between its base and the bailey; the latter is semilunar in shape.
From the left auricle, the blood is forced past the bicuspid valve to the left ventricle; thence it is driven through the semilunar valves into the great aorta, the main trunk of the arterial system.
Thence it is driven past the semilunar valves, through the pulmonary artery, to the lungs.
On the right side, in front of the external half of the sclerotic, was observed a semilunar fold with the concavity inward, and which projected much more when the lower lid was depressed.
Semilunar is sometimes used, perhaps with greater accuracy, to express the same shape.
The apex is fixed into the plantar surface of the os pedis, in front of its semilunar ridge.
The posterior region, lying immediately behind the semilunar crest, shows on each side of a median process a large foramen, the Plantar Foramen.
This is a venous system within the structure of, and occupying the semilunar sinus of the os pedis.
The circle of vessels so formed is called the Plantar Arch or the Semilunar Anastomosis.
At its point of insertion into the semilunar crest the tendon is severed and afterwards reflected.
From the semilunar anastomosis radiate two main groups of arterial branches, an ascending group and a descending one.
The two large apical holes are separated by a latticed semilunar septum, the upper edge of which is concave, and bears two rudimentary horns.
From the centre of its top diverge three stout arches or semilunar rods, which are curved downwards, and unite with the three horizontal, radial beams of the collar-septum inside the collar-ring.
After tying or plugging up the holes in the sides of the artery, pour water into the small end and observe the closing of the semilunar valve.
The left semilunar valve is around the opening of the left ventricle into the aorta, and is similar in all respects to the right semilunar valve.
The second sound is due to the closing of the semilunar valves.
Separate the aorta from the other blood vessels and cut it entirely free from the heart, care being taken to leave enough of the heart attached to the artery to insure the semilunar valve’s being left in good condition.
The first sound is caused mainly by the tricuspid and mitral valves, and the second is the result of sudden closure of the semilunar valves.
Four other pairs of abdominal ganglia connected with, the lumbar branches are united by filaments to form the semilunar ganglion.
The hymen is a circular, or semilunar membrane, which imperfectly closes the outer orifice of the vagina in the virgin.
In the abdomen the sympathetic centers are situated upon the coeliac artery, and are termed, collectively, the semilunar coeliac ganglion.
The mouth is semilunar in form, and the lip sharp.
But when Nature came to the buffers of the spinal column (intervertebral disks) and the washers of the joints (semilunar fibrocartilages of the knee, etc.
Two equal semilunar flaps of skin should be cut (Plate I.
Some authors recommend a semilunar anterior flap; this is quite unnecessary, increases bagging and delays union.
In cases where much injury has been done to the floor of the axilla and wall of chest, the deltoid flap must be made large in proportion, and triangular rather than semilunar in shape.
The limb being held in an extended position, a single semilunar incision (Plate I.
Achillis towards the external border of the plantar aspect of the heel, along which it is continued in a semilunar direction.
There are risks on the one hand of a most unseemly exophthalmos with divergent squint, and on the other of a retraction of the semilunar fold, so that the sub-conjunctival operation is always preferable.
A semilunar incision along the base of the jaw, from one angle to the other, detaches the muscles and soft structures, and is thrown down; the tongue is then drawn through the opening, and can be freely dealt with either by knife or ligature.
A long anterior flap should be cut with a semilunar end (Plate II.
If necessary, it can be performed without any incision into the mouth, by one semilunar sweep from one articulation to the other, passing along the lower margin of each side of the body, and just below the symphysis of the chin.
Sedillot makes a semilunar or ovoid flap, the base of which is just below the great trochanter, and which includes it, the convexity being upwards and the flap being turned down.
Whenever, therefore, the semilunar valves of either the pulmonary artery or the systemic aorta become diseased, it must be extremely difficult to distinguish by the sounds alone, during life, in which of the two the derangement exists.
Schoolcraft,[771] moreover, regards the semilunar perforated maces as actual weapons of war.
Other examples of semilunar implements were also found.
By means of the straight iris forceps and sharp-pointed scissors a semilunar conjunctival flap is first raised over the site for the scleral incision.
It is separated from the skin on the anterior surface of the ear, and the semilunar piece of skin and cartilage is thus removed.
The ear is turned forward and a semilunar portion of the skin is marked out and deepened down to the cartilage.
The base of this semilunar portion should be equal in length to the upper margin of the flap that is to form the new lid (Fig.
