key concept the skeletal system includes bones and tissues ... the skeletal system includes bones...

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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.

    skull

    rib

    breastbone

    vertebra

    – supports body and protects

    tissues

    – allows for limited movement

  • 33.1 Skeletal System

    – cushions bones

    – allows for smooth movement

    – connect two bones

    • Cartilage is connective tissue between 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

    allow for movement

    fibrous joint

  • 33.1 Skeletal System

    Bones connect to form joints.

    • Joints are places were two bones meet.

    • There are three types of joints.

    cartillage

    – cartilaginous, which allows partial movement

  • 33.1 Skeletal System

    Bones connect to form joints.

    – synovial, which allows

    for greater movement

    • Joints are places were two bones meet.

    • There are three types of joints.

  • 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

    – ball-and-socket

    – saddle

    – hinge

    GLIDING JOINT

    PIVOT JOINT

    BALL-AND-SOCKET JOINT

    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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