Joint Classifications and Structures

Vocabulary practice flashcards covering bone tissue histology, gross anatomy, intramembranous and endochondral ossification, bone remodeling, and structural/functional classifications of joints.

Synarthrosis

A functional joint classification describing an immovable articulation that provides maximal joint stability.

Amphiarthrosis

A functional joint classification describing an articulation that permits a small amount of movement.

Diarthrosis

A functional joint classification describing a freely moveable articulation characterized by high mobility and low stability.

Fibrous Joint

A joint category where articulating bones are connected directly by dense regular collagenous connective tissue without a joint space.

Suture

An immovable fibrous joint (synarthrosis) binding adjacent skull bones together using short dense regular collagenous fibers.

Gomphosis

An immovable fibrous joint (synarthrosis) anchoring each tooth into its dental alveolus in the jaw bone via the periodontal ligament.

Syndesmosis

An amphiarthrotic fibrous joint where bones are linked together by an interosseous membrane or ligament, such as between the radius and ulna or tibia and fibula.

Synchondrosis

A cartilaginous joint in which articulating bones are held together by hyaline cartilage, typically acting as a synarthrosis (e.g., epiphyseal plate, first sternocostal joint).

Symphysis

An amphiarthrotic cartilaginous joint in which articulating bones are joined by a fibrocartilaginous pad or plug, adapted to resist tension and compression (e.g., pubic symphysis, intervertebral joints).

Articular Capsule

A two-layered sleeve enclosing a synovial joint cavity, consisting of an outer fibrous layer of dense irregular connective tissue and an inner synovial membrane.

Synovial Fluid

A thick, viscous, oily liquid secreted by synoviocytes into the synovial cavity that provides lubrication, metabolic supply, and shock absorption.

Bursa

A fluid-filled sac lined with a synovial membrane located between bones, muscles, tendons, or skin to reduce friction in regions of high physical stress.

Tendon Sheath

A specialized, elongated tubular bursa that encases long tendons traveling across synovial joints to protect them from friction.