Lab Practical 2 Study Guide: Bones, Bone Structure, and Joints

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Bone tissue contains several specialized cells, each with distinct functions essential for bone health and maintenance.

Osteoblasts: Cells responsible for bone formation. They synthesize and secrete the bone matrix.
Osteocytes: Mature bone cells that maintain the bone matrix and communicate with other bone cells.
Osteoclasts: Cells that break down bone tissue, aiding in bone remodeling and calcium release.
Osteoprogenitor cells: Stem cells that differentiate into osteoblasts.

Long bones have a distinct anatomy that supports their function in movement and weight-bearing.

Diaphysis: The shaft of the bone, composed mainly of compact bone.
Epiphysis: The ends of the bone, containing spongy bone and red bone marrow.
Metaphysis: The region between the diaphysis and epiphysis, site of growth during development.
Medullary cavity: Central cavity within the diaphysis, filled with yellow bone marrow in adults.
Periosteum: A membrane covering the outer surface of bones, important for growth and repair.
Endosteum: A membrane lining the inner surface of the medullary cavity.

Bones are primarily made of a matrix containing organic and inorganic components.

Organic: Collagen fibers provide flexibility and tensile strength.
Inorganic: Hydroxyapatite (calcium phosphate crystals) provides hardness and strength.

Red bone marrow: Found in spongy bone; site of blood cell production (hematopoiesis).
Yellow bone marrow: Found in the medullary cavity; stores fat.

The vertebral column consists of several types of vertebrae, each with unique features.

Hyoid bone: Located in the neck; does not articulate with any other bone. Supports the tongue and is associated with swallowing.

Joints are classified based on their structure and function.

Fibrous joints: Bones joined by dense connective tissue; mostly immovable (e.g., sutures in the skull).
Cartilaginous joints: Bones joined by cartilage; allow limited movement (e.g., intervertebral discs).
Synovial joints: Freely movable joints with a synovial cavity (e.g., knee, shoulder).

Joint Type	Example	Movement
Hinge	Elbow	Flexion/Extension
Ball-and-socket	Shoulder, Hip	Multiaxial (all directions)
Pivot	Atlas/Axis	Rotation
Gliding	Carpals	Sliding
Saddle	Thumb	Flexion/Extension, Abduction/Adduction
Condyloid	Wrist	Flexion/Extension, Abduction/Adduction

Articular cartilage: Smooth, white tissue covering the ends of bones in synovial joints.
Type: Hyaline cartilage.
Function: Reduces friction and absorbs shock during movement.

Joints allow various types of movement, classified by their direction and function.

Abduction: Movement away from the midline.
Adduction: Movement toward the midline.
Flexion: Decreasing the angle between two bones.
Extension: Increasing the angle between two bones.
Rotation: Turning a bone around its axis.
Circumduction: Circular movement combining flexion, extension, abduction, and adduction.

Bone models are often used in lab practicals to identify specific bones and their features.
Understanding anatomical terminology (medial, lateral, superior, inferior) is essential for describing bone locations.
Red bone marrow is more abundant in children; yellow bone marrow increases with age.