Human Joint Structure and Function Quiz

Fibrous joints lack synovial fluid, distinguishing them from synovial joints.

The elbow primarily permits flexion and extension movements, typical of a hinge joint.

Ligaments strengthen and stabilize joints, preventing excessive movement.

The temporomandibular joint facilitates primarily hinge-like opening and closing motions of the jaw.

Synovial membranes secrete synovial fluid, lubricating joints and providing nutrients to cartilage.

The elbow permits these varied movements due to its complex structure involving the ulna, radius, and humerus.

Bursae are fluid-filled sacs that reduce friction between tendons, ligaments, and bones near joints.

The LCL provides lateral stability to the knee joint, situated outside its capsule.

The ankle primarily enables dorsiflexion (extension) and plantarflexion (flexion) movements.

The meniscus acts as a shock absorber, distributing weight and enhancing joint stability.

The thumb's saddle joint structure allows for oppositional movement, unique to this joint type.

The atlanto-occipital joint permits flexion and extension of the head, akin to nodding.

The quadriceps femoris muscle group extends the knee joint, crucial for activities like walking and running.

Synovial joints are characterized by the presence of a synovial cavity containing synovial fluid.

Articular cartilage cushions joint surfaces, reducing friction and shock absorption.

The shoulder joint's ball-and-socket structure grants it the broadest range of motion among human joints.

A herniated nucleus pulposus refers to a condition where the intervertebral disc's inner core protrudes, often causing nerve compression.

Cruciate ligaments stabilize the knee joint, particularly against rotational stresses.

Hinge joints offer considerable stability due to their simple structure, although they permit limited motion.

The saddle-shaped carpometacarpal joint at the base of the thumb permits oppositional movement.