Chap5 - Bones and The Skeletal System Function of Bones 1....

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Bones and The Skeletal System
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Function of Bones 1. Protection - of soft tissues and organs. 2. Movement – muscles attached to bones= function as levers. 3. Storage – of minerals (Calcium and Phosphorous) and lipids ( yellow marrow) 4. Blood Cell Formation- hematopoiesis- occurs within the marrow of the bone. 5. Support- for the entire body; Individual bones provide a framework for attachment of soft tissues and organs.
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Bones of the Human Body The adult skeleton has 206 bones Two basic types of bone tissue Compact bone Homogeneous Spongy bone Small needle-like pieces of bone Many open spaces Figure 5.2b
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Classification of Bones
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Gross Anatomy of a Long Bone Diaphysis Shaft Composed of compact bone Epiphysis Ends of the bone Composed mostly of spongy bone Figure 5.2a
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Classification of Bones Long Bones- Relatively long and slender; occurs in the forearm, thigh and leg (A shaft w/ 2 heads) Mostly compact . Short Bones- Short and Boxy: carpal bones, tarsal bones.( mostly spongy) Flat Bones-thin, flattened, usually curved. ; Most bones of Skull, ribs, sternum. have 2 layers of compact bones sandwiched w/ one layer of spongy. Irregular Bones- the vertebrae. ( Misc.)
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Bone Tissue
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Bones - Organs of t he sk elet al syst em . Consist of several t issue t ypes Ac t ive Living Tissues Bone Cartilage Fibrous connective tissue Blood Nerve Non-living Mat erial Calcium phosphate Calcium carbonate Mat rix prot eins
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The Skeletal System Parts of the skeletal system Bones (skeleton) Joints Cartilages Ligaments Divided into two divisions Axial skeleton Appendicular skeleton
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Long Bones Longer than wide Shaft is Composed of compact bone Ends are composed spongy bone Found: bones of limbs & digits
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Structures of a Long Bone Periosteum Outside covering of the diaphysis Fibrous connective tissue membrane Sharpey’s fibers Secure periosteum to underlying bone Arteries Supply bone cells with nutrients Figure 5.2c
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Red Marrow : : Forms Erythrocytes : Forms Leucocytes : Forms Thrombocytes : Red color is due to hemoglobin Location: Skull Sternum Clavicles Vertebrae Pelvis Ribs
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Long Bone Formation and Growth Figure 5.4a
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locations in the skeletal system
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Chap5 - Bones and The Skeletal System Function of Bones 1....

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