33 1 Skeletal System KEY CONCEPT The skeletal
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33. 1 Skeletal System KEY CONCEPT The skeletal system includes bones and tissues that are important for supporting, protecting, and moving your body.
33. 1 Skeletal System Your skeletal system is made up of the appendicular and axial skeletons. • The skeletal system protects, supports, and moves the body.
33. 1 Skeletal System • The appendicular skeleton includes legs, arms, feet and hands. – allows for movement – includes bones called girdles that connect limbs to body
33. 1 Skeletal System • The axial skeleton includes the skull, rib cage, and spinal column. – supports body and protects skull tissues – allows for limited movement rib breastbone vertebra
33. 1 Skeletal System • Cartilage is connective tissue between bones. – cushions bones – allows for smooth movement – connect two bones cartilage
33. 1 Skeletal System Bones connect to form joints. • Joints are places were two bones meet. • There are three types of joints. – fibrous, which does not fibrous joint allow for movement
33. 1 Skeletal System Bones connect to form joints. • Joints are places were two bones meet. • There are three types of joints. – cartilaginous, which allows partial movement cartillage
33. 1 Skeletal System Bones connect to form joints. • Joints are places were two bones meet. • There are three types of joints. – synovial, which allows for greater movement
33. 1 Skeletal System • Ligaments are long bands of tissue that connect bones across a joint. ligament
33. 1 Skeletal System • There are several types of synovial joints. – gliding – pivot GLIDING JOINT – ball-and-socket PIVOT JOINT – saddle BALL-AND-SOCKET JOINT – hinge SADDLE JOINT HINGE JOINT
33. 1 Skeletal System Bones are living tissue. • Bone is made of compact bone tissue and spongy bone tissue. Compact bone Spongy bone
33. 1 Skeletal System • Compact bone is hard and dense. – Osteocytes (bone cells) maintain compact bone rings. – Haversian canals allow blood vessels in the bone. osteocytes blood vessel Haversian canals
33. 1 Skeletal System • Spongy bone protects red or yellow bone marrow. – Red bone marrow produces blood cells. – Yellow bone marrow is mostly fat. Periosteum A layer of connective tissue that covers bone Red bone marrow
33. 1 Skeletal System • Calcification is the process of building hard bone. – combines collagen and calcium phosphate – transforms cartilage into hard bone during childhood osteocyte compact bone
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