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structure of a long bone click to hear : structure of a long bone

Long bone: elongated bone consisting of a body (diaphysis) and two terminal parts (epiphyses), such as the leg and arm bones (femur, radius, phalanges and others).
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See structure of a long bone in : french | spanish
medullary cavity Haversian canal periosteum Volkmann’s canals osteon concentric lamellae articular cartilage spongy bone blood vessel compact bone bone marrow

medullary cavity click to hear : medullary cavity

Cylindrical central cavity of the bone containing the bone marrow; this canal encloses lipid-rich yellow bone marrow.

Haversian canal click to hear : Haversian canal

Lengthwise central canal of the osteon enclosing blood vessels and nerves.

periosteum click to hear : periosteum

Fibrous membrane rich in blood vessels that envelopes the bone, except at the articular surfaces; it contributes especially to the bone’s growth in thickness.

Volkmann’s canals click to hear : Volkmann’s canals

Transverse canals of the compact bone enclosing blood vessels and nerves; they connect the Haversian canals with each other and with the medullary cavity and the periosteum.

osteon click to hear : osteon

Elementary cylindrical structure of the compact bone made up of four to 20 concentric bone plates that surround the Haversian canal.

concentric lamellae click to hear : concentric lamellae

Bony layers of osteon made of collagen fibers; they are arranged concentrically around the Haversian canal and form as the bones grow.

articular cartilage click to hear : articular cartilage

Smooth resistant elastic tissue covering the terminal part of the bone where it articulates with another bone; it facilitates movement and absorbs shocks.

spongy bone click to hear : spongy bone

Tissue made of bony compartments separated by cavities filled with bone marrow, blood vessels and nerves; this structure gives bones their lightness.

blood vessel click to hear : blood vessel

Channel in the bone through which the blood circulates, carrying the nutrients and mineral salts the bone requires.

compact bone click to hear : compact bone

Dense bone tissue composed of osteons, which resist pressure and shocks and protect the spongy tissue; it forms especially the diaphysis of the long bones.

bone marrow click to hear : bone marrow

Soft substance contained in bone cavities, producing blood cells; marrow is red in children, yellow in the long bones of adults.