. Natural history. Zoology. THE ANIMAL , Figr. 1.—Human Skeleton. arm-bone, or Iiumerus (4), articu- lating to tlie blade-bone. The for,-;- arm (/) comprises two bones, the radius (5) anteriorly, and ulna (6) posteriorly, both articulating with the lower end of the humerus, and the upper end of the latter form- ing the prominence of the elbow. At the lower end of the radius and ulna comes the wrist joint, or car- pus (7), consisting of an upper and lower row of small massive bones, frequently having a central bone between them. To the upper row of bones, counting from the side of the
. Natural history. Zoology. THE ANIMAL , Figr. 1.—Human Skeleton. arm-bone, or Iiumerus (4), articu- lating to tlie blade-bone. The for,-;- arm (/) comprises two bones, the radius (5) anteriorly, and ulna (6) posteriorly, both articulating with the lower end of the humerus, and the upper end of the latter form- ing the prominence of the elbow. At the lower end of the radius and ulna comes the wrist joint, or car- pus (7), consisting of an upper and lower row of small massive bones, frequently having a central bone between them. To the upper row of bones, counting from the side of the thumb to the little finger, the names of scaphoid, lunar, and cuneiform are applied. When these three bones directly overlie the bones of the lower row, the carpus is said to be of the linear type ; but when they overlap, it is said to be an alternating carpus. The wrist is followed by the metacarpal bones (8), which never exceed live in number, and these again by the phalanges, or bones of the digits; such'digits (9) being likewise never more than five in number. Where- as in the first digit, or thumb, there are but two phalanges, in the other digits til ere are normally three. The pelvic-girdle (3), or that by which the hind-limb is sup- ported, differs essentially from the shoulder-girdle, in that it is immovably fixed \j the backbone at the sacrum. Vhe pelvis, as the whole structur3 is called, is di- vided into a right and left inno- minate bone. In the higher Mam- mals, each innominate of a single bone, although it primar- ily consists of three distinct ele- ments. The uiipermost of these, and the one by means of which the attachment to the sacrum is made, is called the haunch-bone, or ilium (((), and corresponds to tlie scapula in the fore-limb. In- feriorly there are two elements, of which tlie fii-st is tlie pubis, and. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and
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Keywords: ., bookauthorly, bookcentury1800, bookdecade1890, booksubjectzoology
