noun
definition
The breastbone
definition
The sclerotized plate of spiders, between the coxae, marking the floor of the cephalothorax
Examples of sternum in a Sentence
The last I to 5 of these vertebrae have movable ribs which do not reach the sternum, and are called cervico-dorsals.
They are attached from your sternum or breastbone to the top of each of your upper arms.
The median and posterior extension of the body of the sternum is a direct outgrowth of the latter, therefore FIG.
Often it reaches the keel of the sternum, with subsequent syndesmosis or even synostosis, e.g.
Respiratory organs tracheal, opening by a pair of stigmata situated immediately behind the basal segments of the 6th pair of appendages on what is probably the sternum of the 2nd opisthosomatic somite and also in some cases upon the 5th segment of the legs.
No 1 Internally there Is a great difference in the form of the posterior margin of the sternum, as long ago remarked by Nitzsch.
So far as is known the sternum of all the Snipes, except the Jack-Snipe, departs from the normal Limicoline formation, a fact which tends to justify the removal of that species to a separate genus, Limnocryptes.
On the other hand L'Herminier in 1827 saw features in the Tinamou's sternum that in his judgment linked the bird to the Rallidae.
There is a compound abdominal sternum.
Scarcely anything is known of the sternum, and little of the shoulder-girdle, except the very stout furcula; scapula typically bird-like.
The trunk is relatively small, with few slender ribs and a keeled breastbone (sternum).
A dorsal and a ventral plate are often distinguished, known respectively as the tergum and the sternum, and the tergum may overhang the insertion of the limb on each side as a free plate called the pleuron.
The ribs are eighteen or nineteen in number on each side, flattened, and united to the sternum by short, stout, tolerably well ossified sternal ribs.
The sternum consists of six pieces; the anterior or presternum is compressed and projects forwards like the prow of a boat.
It is in fact doubtful whether the so-called sternum of batrachians, in most cases a mere plate of cartilage, has been correctly identified as such.
A cartilage in the median line in front of the precoracoids, sometimes supported by a bony style, is the so-called omosternum; a large one behind the coracoids, also sometimes provided with a bony style, has been called the sternum.
When you have your surgery, it is necessary for the surgeon to cut the breastbone (sternum) to get to the heart.
I had a broken sternum many years ago; other than that, nothing too bad.
The sternum is rejoined using wires and the skin on the chest is closed with dissolvable stitches.
In the following year .another set of hints - of a kind so different that probably no one then living would have thought it possible that they should ever be brought in correlation with those of Nitzsch - are contained in a memoir on Fishes contributed to the tenth volume of the Annales du Museum d'histoire naturelle of Paris by Etienne Geoffroy St-Hilaire in 1807.1 Here we have it stated as a general truth (p. too) that young birds have the ' sternum formed of five separate pieces - one in the middle, being its keel, and two " annexes " on each side to which the ribs are .articulated - all, however, finally uniting to form the single " breast-bone."
It is evident that the features of the sternum of which De Blainville chiefly relied were those drawn from its posterior margin, which no very extensive experience of specimens is needed to show are of comparatively slight value; for the number of " echancrures - notches as they have sometimes been called in English - when they exist, goes but a very short way as a guide, and is so variable in some very natural groups as to be even in that shot way occasionally misleading.
There is no evidence, so far as we can see, of his having been aware of Merrem's views; but like that anatomist he without hesitation divided the class into, two great " coupes," to which he gave, however, no other names than " Oiseaux normaux " and" Oiseaux anomaux "-exactly corresponding with his predecessor's Carinatae and Ratitae-and, moreover, he had a great advantage in founding these groups, since he had discovered, apparently from his own investigations, that the mode of ossification in each was distinct; for hitherto the statement of there being five centres of ossification in every bird's sternum seems to have been accepted as a general truth, without contradiction, whereas in the ostrich and the rhea, at any rate, L'Herminier found that there were but two such primitive points, 3 and from analogy 1 Their value was, however, understood by Gloger, who in 1834, as will presently be seen, expressed his regret at not being able to use them.
It was only when, after a close examination of the sternal apparatus of one hundred and thirty species, which he carefully described, that he arrived (pp. 177-183) at the conclusion - astonishing to us who know of L'Herminier's previous results - that the sternum of birds cannot be used as a help to their classification on account of the egregious anomalies that would follow the proceeding - such anomalies, for instance, as the separation of Cypselus from Hirundo and its alliance with Trochilus, and the grouping of Hirundo and Fringilla together.
The-considerations are not very striking from a general point of view; but the author adds to the weight of evidence which some of his predecessors had brought to bear on certain matters, particularly in aiding to abolish the artificial groups " Deodactyls," "Syndactyls," and " Zygodactyls," on which so much reliance had been placed by many of his countrymen; and it is with him a great merit that he was the first apparently to recognize publicly that characters drawn from the posterior part of the sternum, and particularly from the " echancrures," commonly called in English " notches " or " emarginations," are of comparatively little importance, since their number is apt to vary in forms that are most closely allied, and even in species that are usually associated in the same genus or unquestionably belong to the same family, 2 while these " notches " sometimes become simple foramina, as in certain pigeons, or on the other hand foramina may exceptionally change to " notches," and not unfrequently disappear wholly.
The spider owes its name Argyroneta or the silver swimmer to its silvery appearance as it swims about under water enveloped in air, and its power to retain an envelope of air on its sternum and abdomen depends upon the circumstance that these areas are beset with hairs which prevent the water reaching the integument; but the air retained by these hairs can be released when the spider wishes to fill its subaqueous home with that element.
In general structure they all closely resemble human beings, as in the absence of tails; in their semi-erect position (resting on finger-tips or knuckles); in the shape of vertebral column, sternum and pelvis; in the adaptation of the arms for turning the palm uppermost at will; in the possession of a long vermiform appendix to the short caecum of the intestine; in the size of the cerebral hemispheres and the complexity of their convolutions.
The segments which follow gradually widen, and tie hinder part of the sternum is broad and flat.
The straps and back are padded and there is also a waist and sternum strap to keep it all secure.
His position in the general job market as a result of his sternum fracture has not been put at risk.
Place the tape measure at the base of your dog's throat and measure to his sternum, which is the area just below his rib cage.
If you're top heavy, you should find a V-neck coat that has its first button higher than the top of your sternum.
Pectus excavatum is a malformation of the chest in which the child's breastbone, or sternum, is sunken inward.
In other children with Marfan, the sternum is pushed outward and narrowed.
Pectus carinatum-An abnormality of the chest in which the sternum (breastbone) is pushed outward.
Pectus excavatum-An abnormality of the chest in which the sternum (breastbone) sinks inward; sometimes called "funnel chest."
Physical examination of the infant may show arched type fingerprint patterns, while x rays may reveal a short breast bone (sternum).
Chest compressions are delivered by placing two fingers of one hand over the lower half of the infant's sternum slightly below the nipple line and pressing down about one half inch to one inch.
Chest compressions are delivered by placing the heel of one hand over the lower half of the sternum and depressing about one to one and one half inches per compression.
For a child aged eight years and older, and for larger children under age eight, two hands are used for compressions, with the heel of one hand on the lower half of the sternum and the heel of the other hand on top of that hand.
The other end splits, with one end attaching to the clavicle (collarbone) and the other to the top of the sternum (breastbone).
Sternum piercings can run horizontally or vertically around the sternum.
An experienced piercer will be able to tell if a person is suitable for this type of piercing, as not every person will be a good candidate for a sternum piercing.
Place a long, thin Celtic knot stretched horizontally across the lower back, with the middle of the knot dipping toward the sternum for a delicately balanced design.
Surface piercings are used to put piercings in areas where piercing through a body part is not an option, such as the nape of the neck, hips, wrist, sternum, arms and stomach.
This will open up the chest between the shoulder and the sternum.
Finally, the showcase muscle, the rectus abdominus, runs down your abdomen from your sternum to your pelvis.
It consists of an adjustable collar with three straps - one angling down toward each breast, one going straight down the sternum.
The anterior margin of the sternum, between the right and left anterior lateral processes receives in sockets the feet of the coracoids.
The keel, or carina sterni, is formed as a direct cartilaginous outgrowth of the body of the sternum, ossifying from a special centre.
The chief muscular mass, arising from the sternum in the shape of a U, is the pectoralis muscle; its fibres converge into a strong tendon, which is inserted upon the greater tubercle and upper crest of the humerus, which it depresses and slightly rotates forwards during the downstroke.