Skeletal System
Biology · कंकाल तंत्र
📋Quick Overview
Human body has 206 bones in adults (300 in babies, fuse over time). Smallest bone = Stapes/Stirrup (in ear). Largest bone = Femur (thigh). Skeleton divided into Axial (skull, spine, ribs = 80 bones) and Appendicular (limbs, shoulders, hips = 126 bones). Joints: Fixed/Immovable (skull), Hinge (elbow, knee), Ball-and-Socket (shoulder, hip), Pivot (neck). Bone marrow makes blood cells.
📝Key Facts
- •206 bones in adult human body
- •Smallest bone = Stapes (stirrup) in middle ear
- •Largest bone = Femur (thigh bone)
- •Longest bone = Femur; Smallest = Stapes
- •Skull has 22 bones (8 cranial + 14 facial)
- •Spine has 33 vertebrae (7 cervical + 12 thoracic + 5 lumbar + 5 sacral + 4 coccyx)
- •Ribs = 12 pairs (24 total)
- •Ball-and-socket joint allows maximum movement (shoulder, hip)