Review the key concepts, formulae, and examples before starting your quiz.
🔑Concepts
Joints are essential for all types of movements involving the bony parts of the body. In these movements, joints act as a fulcrum for the force generated by the muscles.
Fibrous Joints: These do not allow any movement. For example, the flat skull bones which fuse end-to-end with the help of dense fibrous connective tissues in the form of sutures to form the cranium.
Cartilaginous Joints: The bones involved are joined together with the help of cartilages. This joint permits limited movement, such as between the adjacent vertebrae in the vertebral column.
Synovial Joints: Characterized by the presence of a fluid-filled synovial cavity between the articulating surfaces of the two bones. This arrangement allows considerable movement and assists in locomotion.
Ball and Socket Joint: Found between the humerus and pectoral girdle, and between the femur and acetabulum of the pelvic girdle ().
Hinge Joint: Allows movement primarily in one plane, such as the knee joint and elbow joint.
Pivot Joint: Found between the first cervical vertebra, the Atlas, and the second, the Axis ().
Gliding Joint: Found between the carpals of the wrist.
Saddle Joint: Found between the carpal and metacarpal of the thumb.
Gout: Inflammation of joints due to the accumulation of uric acid () crystals.
Osteoarthritis: Degeneration of joint cartilage and the underlying bone, often associated with the depletion of and aging.
📐Formulae
💡Examples
Problem 1:
Identify the type of synovial joint present between the Atlas and Axis vertebrae that allows the 'no' movement of the head.
Solution:
Pivot Joint
Explanation:
The Pivot joint ( joint) consists of a bony pivot-like process that rotates within a ring formed by another bone and a ligament. In the case of the Atlas () and Axis (), the odontoid process of the axis fits into the atlas, allowing rotational movement.
Problem 2:
A patient suffers from inflammation of joints and tests positive for high levels of in the blood. Name the condition.
Solution:
Gout (Gouty Arthritis)
Explanation:
Gout is a metabolic disorder characterized by hyperuricemia, where excess uric acid () precipitates as monosodium urate crystals in the synovial fluid, leading to acute inflammation.
Problem 3:
Contrast the movement allowed by the joint in the cranium vs the joint in the pubic symphysis.
Solution:
Cranium: Zero movement; Pubic symphysis: Limited movement.
Explanation:
The cranium uses fibrous joints (sutures) which are (immovable). The pubic symphysis is a cartilaginous joint (symphysis) which is an , allowing limited movement especially during childbirth.