ANATOMY - Skeletal System
1. Bones: Number, Type, and Classification Total Count Adult Skeleton: 206 bones . Infant Skeleton: ~270 to 300 bones (many fuse together during growth). Classification by Shape & Type Bones are classified into five main types based on their shape: Long Bones: Longer than they are wide. Act as levers. Examples: Femur (longest/strongest), Humerus, Tibia, Fibula, Radius, Ulna. Short Bones: Cube-shaped, provide stability and some movement. Examples: Carpals (wrist), Tarsals (ankle). Flat Bones: Thin, flattened, usually curved. Protect vital organs and provide large surfaces for muscle attachment. Examples: Cranial bones (skull), Sternum, Ribs, Scapula. Irregular Bones: Complex shapes that don't fit other categories. Examples: Vertebrae, Sacrum, Mandible, Hyoid. Sesamoid Bones: Small, round bones embedded in tendons. They protect tendons from ...