BONES How many bones in the human body? 206.

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Presentation transcript:

BONES How many bones in the human body? 206

FUNCTIONS OF BONES Muscle attachment Protect/support tissues Blood-producing cells (stored in liver & spleen; later in marrow) inorganic salts Ca, Mg, Na, K, CO3 Passage ways for nerves & blood vessels

TISSUES IN BONES Bone Cartilage Blood Nerve dense connective

TYPES OF BONES Long: longer than wide; shaft w/2 ends Short: cube-shaped Sesamoid: sesame seed shape Flat: thin, flat, slightly curved Irregular: complex shapes

Typical Long Bone

Functions of Long Bone Features Diaphysis: bone shaft (compact bone) Epiphysis: articulates w/ other bones; forms joints (spongy bone) Articular cartilage: coats epiphysis Periosteum: surrounds & protects bone; forms bone & helps in repair Epiphyseal plate: help w/ compressional forces Medullary Cavity: hollow chamber in bone; contains marrow Marrow: soft net-like mass of connective tissue Red Marrow: forms RBC, WBC, platelets, hemoglobin Yellow Marrow: Stores fat Endosteum: layer of cells that lines the medullary cavity Osteon: (Haversian Canal) cylindrical unit within compact bone; contain blood vessels & nerves

Osteon/Haversian Canal Allows nerves & blood vessels To pass