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Encyclopedia > Epiphyseal plate

The long bones are those that are longer than they are wide, and grow primarily by elongation of the diaphysis at an epiphysis at one end of the growing bone. The ends of epiphyses are covered with a hyaline cartilage ("articular cartilage"). The longitudinal growth of long bones is a result of endochondral ossification at the epiphyseal plate. Bone growth in length is stimulated by the production of growth hormone(GH), a secretion of the anterior lobe of the pituitary gland . The diaphysis is the main or mid section (shaft) of a long bone. ... For other uses of the word bone, see bone (disambiguation). ... Grays illustration of a human femur, a typically recognized bone. ... Cartilage is type of dense connective tissue. ... Section of fetal bone of cat. ... Growth hormone Growth hormone is a polypeptide hormone synthesised and secreted by the anterior pituitary gland which stimulates growth and cell reproduction in humans and other vertebrate animals. ... The pituitary gland, or hypophysis, is an endocrine gland about the size of a pea that sits in the small, bony cavity (sella turcica) at the base of the brain. ...

The long bones include the femurs, tibias, and fibulas of the legs, the humeri, radii, and ulnas of the arms, and the phalanges of the fingers and toes. The long bones of the leg comprise nearly half of adult height. The other primary skeletal component of height is the spine and skull. The femur or thigh bone is the longest, most voluminous. ... Figure 1 : Upper surface of right tibia. ... Figure 1 : Lower extremity of right fibula. ... The humerus is a long bone in the arm or fore-legs (animals) that runs from the shoulder to the elbow. ... The radius and ulna of the left forearm, posterior surface. ... The ulna (Elbow Bone) [Figs. ... Look up phalanx in Wiktionary, the free dictionary Phalanx (Greek word from phalangos, meaning Finger) can refer to: phalanx formation in ancient warfare. ... A diagram of a thoracic vertebra. ... A hippopotamus skull A skull, or cranium, is a bony structure of Craniates which serves as the general framework for a head. ...

The outside of the bone consists of a layer of connective tissue called the periosteum. Additionally, the outer shell of the long bone is compact bone, then a deeper layer of cancellous (spongey bone) which contains red bone marrow. The interior part of the long bone is the medullary cavity with the inner core of the bone cavity being composed of (in adults) of yellow marrow. The periosteum is an envelope of fibrous connective tissue that is wrapped around the bone in all places except at joints (which are protected by cartilage). ... Cancellous is a type of cancer in the bone. ... Grays Anatomy illustration of cells in bone marrow. ... The medullary cavity is the central cavity of bone shafts where yellow marrow (adipose) is stored. ...

There are five general classifications of bones: (1) Long bones, (2) Short bones, (3) Flat bones, (4) Irregular bones, and (5) Sesamoid bones. Where a part of the skeleton is intended for strength and compactness combined with limited movement, it is constructed of a number of short bones, as in the carpus and tarsus. ... Flat Bones. ...


  • Stedman's Online Medical Dictionary, 27th Edition



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