Krista Revell: Krista Revell Skeletal System Functions of the Skeletal System: Functions of the Skeletal System Provides a living structure for your body Makes movement possible Protects internal organs Storage for minerals: Calcium and Phosphorus Bone Marrow - CT produces RBC and WBC Structure of the Skeleton: Structure of the Skeleton 206 bones Axial Skeleton (center) – 80 bones: skull, ribs, vertebral column (spine), and sternum Appendicular Skeleton (appendages) – 126 bones: limbs, scapula, clavicle, pelvis (hips) ** In one hand alone…26 bones PowerPoint Presentation: Axial - Green Appendicular - Purple Types of Bones: Types of Bones Outer layer – hard, densely packed compact bone Inner layer – spongy bone, less dense bone with a network of cavities filled with red bone marrow Types of Bones: Types of Bones Long Bones – humerus, femur diaphysis – center of long bone, contains yellow bone marrow and stores fat epiphysis – end of a long bone, form joints and contain red bone marrow (new blood cells are produced) Short Bones – wrist bones Flat Bones – skull (protect), scapula Irregular Bones – facial bones, vertebrae Cartilage: Cartilage A strong, flexible connective tissue (CT) Can be found in many areas of the body: ends of long bones, end of the nose, outer ear Knee Joints – cartilage acts like a cushion Embryo’s skeleton – mostly cartilage… bones will form later Ossification – process by which bone is formed, renewed, and repaired Joints: Joints Point at which bones meet Some joints produce movement and some limited (vertebrae) to not at all (bones of the skull) Ball and Socket – rounded head into rounded cavity. Shoulder and hip. Greatest ROM Hinge – allows joint to bend and straighten. Elbow, knee, ankle and fingers. Promotes rotation Pivot – limited rotation or turning of the head Ellipsoidal – aka gliding joints…allow bones to slide over one another. Wrist bones PowerPoint Presentation: Ligament – band of fibrous, slightly elastic CT that attaches bone to bone. Stabilize movements Tendon – attaches muscle to bone to produce movement Review: Inflammation of a tendon is called what? School House Rock Video: School House Rock Video http://www.youtube.com/v/TOl1jIlsmFc I hope you have a better understanding of the skeletal system. Thanks for Watching!! : I hope you have a better understanding of the skeletal system. Thanks for Watching!!