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long bone


human femur
Gross structure of a long bone (human femur)
Credit: Prentice-Hall: Martini/Timmons 1997
long bone sectional diagram
Sectional diagram of a long bone
A bone that is significantly longer than it is wide. Examples of long bones are the femur, tibia, and fibula of the leg, the humerus, radius, and ulna of the arm, and the phalanges of the fingers and toes. A long bone consists of a long shaft (diaphysis) with two bulky ends or extremities (epiphyses).

The outer part of a long bone is made of compact bone. Inside this is a layer of spongy (cancellous) bone which contains red bone marrow. The interior part of a long bone consists of the medullary cavity.


Related entry

human skeleton human skeleton


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   • ANATOMY AND PHYSIOLOGY


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