AOS1 Unit 1 - The Human Body in Motion: Skeletal System
Appendicular Skeleton
Portion of the skeletal system that consists of the clavicle, scapula, arms, pelvis, legs
Spinal Column
Cervical (7), Thoracic (12), Lumbar (5), Sacrum (5 fused), Coccyx (4 fused)
3 Classification Of Joints
Fibrous (immovable) e.g. skull & pelvis, Cartilaginous (semi-movable) e.g. ribs to sternum, pubic bone, Synovial (freely moveable) (controlled by muscles)
Cranium, Mandible, Clavicle, Sternum, Ribs, Humerus, Ulna, Radius, Carpals, Patella, Fibula, Vertebrae, Pelvis, Metacarpals, Digits, Femur, Tibia, Tarsals, Metatarsals.
Skeletal Bones
Flexion
The angle between the bones decreases
Extension
The angle between the bones increases
Adduction
To bring back to the midline of the body
Abduction
To take away from the midline of body
6 Synovial Joints
Ball and Socket (shoulder/hip), Hinge (elbow/knee), Gliding (carpals/tarsals), Saddle (thumb), Condyloid (wrist), Pivot (neck)
Circumduction
Bones make a cone shape as it moves
Axial Skeleton
Portion of the skeletal system that consists of the skull, rib cage, and vertebral column
How many bones in the human body?
206 bones
Bones Types and examples
Long: Femur, Short: Carpals in wrist and Tarsals in feet, Flat: Cranium, Ribs, Sternum, Irregular: Vertebrae, Mandible, Sesamoid (enclosed in tendon) : Tendons
Rotation
Movement around an axis (neck)
Functions of the Skeletal System
Movement, Protection, Support, Red Blood Cell production & Mineral storage