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Anatomy & Physiology: Skeletal System Lab Key Concepts

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  • Osteon

    The basic functional unit of compact bone tissue.

  • Central canal (Haversian canal)

    Contains one or more blood vessels within an osteon.

  • Lamellae

    Narrow sheets of calcified matrix in compact bone.

  • Osteocytes

    Bone cells located in small pockets called lacunae.

  • Diaphysis

    The central shaft of a long bone.

  • Epiphysis

    The extended portion at each end of a long bone.

  • Periosteum

    The outer surface membrane covering a bone.

  • Medullary cavity

    The space within the bone that contains marrow.

  • Frontal bone

    Forms the forehead of the skull.

  • Foramen magnum

    Opening in the occipital bone where the medulla oblongata connects to the spinal cord.

  • Occipital condyles

    Articulate with the first cervical vertebra (atlas).

  • Sella turcica

    A depression in the sphenoid bone where the pituitary gland sits.

  • Atlas (C1)

    First cervical vertebra that holds up the head and allows nodding; lacks a body and spinous process.

  • Axis (C2)

    Second cervical vertebra that acts as a pivot for head rotation; permits shaking the head "no".

  • Sternum

    Commonly called the breastbone; consists of manubrium, body, and xiphoid process.

  • True ribs

    First 7 pairs of ribs that attach directly to the sternum via costal cartilages.

  • Clavicle

    Also called the collar bone; s-shaped bone articulating with the sternum and scapula.

  • Scapula

    Also called the shoulder blade; flat, triangular bone articulating with the humerus and clavicle.

  • Acromion process

    Part of the scapula that forms the outer angle of the shoulder and articulates with the clavicle.

  • Humerus

    Bone of the arm.

  • Radius

    Lateral bone of the forearm in anatomical position.

  • Ulna

    Medial bone of the forearm in anatomical position.

  • Os coxae (coxal bone)

    Each large hip bone formed by fusion of ilium, ischium, and pubis.

  • Acetabulum

    Curved surface of the pelvic bone where the head of the femur articulates.

  • Femur

    Longest and heaviest bone in the body; the thigh bone.

  • Tibia

    Medial bone of the leg; commonly called the shin bone.

  • Fibula

    Lateral bone of the leg in anatomical position.

  • Patella

    The knee bone.

  • Flexion

    Movement that decreases the angle between articulating bones.

  • Extension

    Movement that increases the angle between articulating bones, often returning to anatomical position.

  • Abduction

    Movement of a bone away from the midline of the body.

  • Adduction

    Movement of a bone toward the midline of the body.

  • Pronation

    Movement of the forearm turning the palm backward.

  • Supination

    Movement of the forearm turning the palm forward, like holding soup.