Bones are rigid organs that constitute part of the endoskeleton of vertebrates. They support and protect the various organs of the body, produce red and white blood cells and store minerals. Bone tissue is a type of dense connective tissue. Bones come in a variety of shapes and have a complex internal and external structure, are lightweight yet strong and hard, and serve multiple functions. One of the types of tissue that makes up bone is the mineralized osseous tissue, also called bone tissue, that gives it rigidity and a coral-like three-dimensional internal structure. Other types of tissue found in bones include marrow, endosteum, periosteum, nerves, blood vessels and cartilage. At birth, there are over 270 bones in an infant human's body, but many of these fuse together as the child grows, leaving a total of 206 separate bones in an adult. The largest bone in the human body is the femur and the smallest bones are auditory ossicles.
Read more about Bone: Mechanical Properties, Cellular Structure, Types, Formation, Remodeling, Paracrine Cell Signalling, Disorders, Osteology, Alternatives To Bony Endoskeletons, Exposed Bone, Uses, Terminology
Other articles related to "bone, bones":
... Histomorphometry of bone involves obtaining a bone biopsy specimen and processing of bone specimens in the laboratory, obtaining estimates of the proportional volumes and surfaces occupied by ... Obtaining a bone biopsy is accomplished by using a bone biopsy trephine ...
... Several terms are used to refer to features and components of bones throughout the body Bone feature Definition articular process A projection that contacts an adjacent bone ... articulation The region where adjacent bones contact each other — a joint ... foramen An opening through a bone ...
... The bone marrow cavity is important for the proper development of the immune system, and houses important stem cells for maintenance of the immune system ... produced by immune cells also have important effects on regulating bone homeostasis ... differentiation and activity of osteoclasts and bone resorption ...
... This bone, collected in 1893, was first identified as the thighbone of a crocodilian, but was described in 1903 by Samuel Wendell Williston as belonging to a pterosaur ... Seaway (including the Kiowa Shale) identifies the bone as more likely the upper part of a plesiosaurian propodial (a limb bone) ...
... endocannabinoid system through CB2 signaling plays a key role in the maintenance of bone mass ... effect is that CB2 agonists attenuates ovariectomy-induced bone loss while increasing cortical thickness ...
Famous quotes containing the word bone:
“the bone dry voices of the peepers
as they throb like advertisements.”
—Anne Sexton (19281974)
“Here lies the body of William Jones
Who all his life collected bones,
Till Death, that grim and boney spectre,
That universal bone collector,
Boned old Jones, so neat and tidy,
And here he lies, all bona fide.”
—Anonymous. Epitaph on William Jones, from Eleanor Broughtons Varia (1925)
“Sang a bone upon the shore;
A man if I but held him so
When my body was alive
Found all the pleasure that life gave:
A bone wave-whitened and dried in the wind.”
—William Butler Yeats (18651939)