Flat bone

Flat Bone

A Flat bone (pronunciation: /flæt boʊn/) is a type of bone found in the human body.

Etymology

The term "flat bone" is derived from the Old English flæt meaning "flat" and bān meaning "bone".

Definition

Flat bones are bones whose principal function is either extensive protection or the provision of broad surfaces for muscular attachment. These bones are expanded into broad, flat plates, as in the cranium (skull), the ilium (pelvis), and the sternum (breastbone).

Structure

The structure of a flat bone is composed of two outer layers of compact bone, also known as cortical bone. Between these layers is a layer of spongy bone material, known as cancellous bone, which is found inside the bone and contains the bone marrow.

Function

Flat bones serve as points of attachment for muscles and often protect internal organs. They have a marrow, but it is generally less productive than the marrow in long bones.

Related Terms

• Cortical bone
• Spongy bone
• Bone marrow
• Long bone
• Cranium
• Ilium
• Sternum

External links

• Medical encyclopedia article on Flat bone
• Wikipedia's article - Flat bone

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