Joint Structure And Function - Massage and Bodywork Licensing Examination Mblex
- What is the primary function of articular cartilage in synovial joints?
- Reduces friction and distributes compressive forces. Its smooth, elastic properties allow efficient load distribution and minimal wear on joint surfaces during motion.
- What is the structural hallmark that defines a synovial (diarthrodial) joint?
- A synovial cavity enclosed by an articular capsule. This feature allows free movement by providing a space filled with lubricating synovial fluid between articulating bones.
- Which joint classification is based on the degree of movement allowed?
- Functional classification. It groups joints according to their mobility range, from immovable to freely movable.
- What is the correct term for a fibrocartilage rim that deepens a socket (shoulder/hip)?
- Labrum. It increases the depth of the glenoid or acetabulum, improving joint stability without restricting mobility.
- What is a diarthrosis (functional classification)?
- A freely movable joint (typically synovial). These joints enable extensive motion due to their synovial structure and supporting elements.
- Which synovial joint type is biaxial and permits flexion/extension and abduction/adduction?
- Condyloid (ellipsoid) joint. Oval surfaces enable motion in two planes, supporting versatile actions without rotation.
- What is a synarthrosis (functional classification)?
- An immovable joint. These joints prioritize stability over mobility, often found in the skull for protection.
- Which synovial joint type is biaxial and permits gliding plus limited rotation (thumb CMC)?
- Saddle joint. Reciprocal concave-convex surfaces allow opposition and circumduction in addition to basic gliding.
- What is the primary difference between a ligament and a tendon?
- Ligament: bone-to-bone; tendon: muscle-to-bone. Ligaments stabilize joints by connecting bones, while tendons transmit muscle force to bones for movement.
- What is an amphiarthrosis (functional classification)?
- A slightly movable joint. They allow minimal movement for shock absorption, as seen in intervertebral discs.
- What are the two primary functions of synovial fluid in a synovial joint?
- Lubrication and nourishment of avascular articular cartilage. Synovial fluid minimizes friction during movement and supplies nutrients to cartilage lacking blood vessels.
- Identify the movement: the distal segment moves away from the body midline in the frontal plane.
- Abduction. This motion occurs laterally from the sagittal plane, increasing the angle between body parts.
- Which layer of the articular capsule produces synovial fluid?
- Synovial membrane (inner layer). This vascular layer secretes hyaluronic acid-rich fluid essential for joint lubrication and nutrition.
- What is a bursa?
- A synovial fluid–filled sac that reduces friction. Located between tissues, it cushions and eases movement by preventing direct contact and abrasion.
- What is the correct term for hyaline cartilage covering bone ends in synovial joints?
- Articular cartilage. It forms a smooth, resilient surface on epiphyseal ends to facilitate joint motion and absorb shock.
- Which synovial joint type is multiaxial and permits the greatest range of motion?
- Ball-and-socket joint. Spherical articulation provides triaxial freedom, ideal for complex movements in shoulder and hip.
- What is a fibrous joint (structural classification)?
- Bones joined by dense fibrous connective tissue. This type provides strong, inflexible connections, typically allowing little to no movement for stability.
- What is the correct term for a fibrocartilage pad that improves joint congruency (knee)?
- Meniscus. It enhances joint stability and shock absorption by increasing the contact area between incongruent bone surfaces.
- Which layer of the articular capsule is continuous with the periosteum and provides strength?
- Fibrous capsule (outer layer). Composed of dense connective tissue, it merges with the bone's periosteum to stabilize the joint structure.
- Which joint classification is based on the type of connective tissue binding the bones?
- Structural classification. It categorizes joints by the material, such as fibrous or cartilaginous, that unites the bones.
- Which synovial joint type primarily permits nonaxial sliding movements between flat surfaces?
- Plane (gliding) joint. Flat articular surfaces facilitate small translations, aiding in fine adjustments and stability.
- What is a cartilaginous joint (structural classification)?
- Bones joined by cartilage (hyaline or fibrocartilage). Cartilage offers resilient yet firm unions, permitting limited flexibility in areas like the spine.
- Which synovial joint type is primarily uniaxial and permits flexion and extension?
- Hinge joint. Its cylindrical shape restricts motion to one plane, mimicking a door hinge for controlled bending.
- Which synovial joint type is uniaxial and permits rotation around a longitudinal axis?
- Pivot joint. A central bony pivot allows rotation, essential for movements like head turning or forearm supination.
- What is a tendon sheath?
- An elongated bursa that reduces friction around a tendon. It wraps around tendons in high-friction areas, allowing smooth gliding and protecting against wear.