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A true endoskeleton is derived from mesodermal tissue. In three phyla of animals, Chordata, Echinodermata and Porifera (), endoskeletons of various complexity are found.An endoskeleton may function purely for structural support (as in the case of Porifera), but often also serves as an attachment site for muscles and a mechanism for transmitting muscular forces as in chordates and echinoderms ...
"24 Hours" is the pilot episode of the medical drama series ER. It first aired on NBC in the United States on September 19, 1994. The episode was written by Michael Crichton, adapted from a screenplay he originally wrote in 1974, and directed by Rod Holcomb.
A skeleton is the structural frame that supports the body of most animals.There are several types of skeletons, including the exoskeleton, which is a rigid outer shell that holds up an organism's shape; the endoskeleton, a rigid internal frame to which the organs and soft tissues attach; and the hydroskeleton, a flexible internal structure supported by the hydrostatic pressure of body fluids.
The first season of the American fictional drama television series ER aired on NBC from September 19, 1994 to May 18, 1995. This season, containing 25 episodes, is the longest running of the series. The two-hour pilot episode aired on September 19, 1994, and was followed by 24 other episodes, including the season finale that aired on May 18, 1995.
In American football, the Philadelphia Eagles defeat the Kansas City Chiefs to win the Super Bowl.; Former president of Namibia Sam Nujoma (pictured) dies at the age of 95.; A series of boycotts against retail stores expands to several countries in Southeast Europe.
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Pages for logged out editors learn more. Contributions; Talk; Endoskeletal
The axial skeleton (80 bones) is formed by the vertebral column (32–34 bones; the number of the vertebrae differs from human to human as the lower 2 parts, sacral and coccygeal bone may vary in length), a part of the rib cage (12 pairs of ribs and the sternum), and the skull (22 bones and 7 associated bones).