Tag: our skeletal system and the skin

• Joints are points of contact between bones, or between bones and cartilages.
  
• Synovial joints are characterized by the presence of a fluid-filled synovial cavity between the articulating surfaces of the two bones. These joints help in locomotion and many other movements. Saddle joint is a type of synovial joint.
• The saddle joint gets its name because the bone forming one part of the joint is concave (turned inward) at one end and looks like a saddle. The other bone's end is convex (turned outward), and looks like a rider in a saddle.
  
• The joint between carpal and metacarpal of human thumb is an example of saddle joint.
  
• So, the correct answer is 'Saddle joint'.

• Joints are points of contact between bones, or between bones and cartilages.
• Synovial joints are characterized by the presence of a fluid-filled synovial cavity between the articulating surfaces of the two bones. These joints help in locomotion and many other movements. Ball and socket joint is a type of synovial joint.
• Synovial joints are of following types: pivot, hinge, saddle, plane, condyloid, and ball-and-socket joints. Hence ball and socket joint, pivot joint, hinge joint are synovial joints.
• So, the correct answer is '1,2 and 3'.

A synovial joint is a connection between two bones consisting of a cartilage lined cavity filled with fluid. There are five types of synovial joints. These are planar joints, hinge joints, condyloid joints, saddle joints and ball and socket joints. So, the correct answer is '5'.

• Joints are points of contact between bones, or between bones and cartilages.
  
• Synovial joints are characterized by the presence of a fluid-filled synovial cavity between the articulating surfaces of the two bones. These joints help in locomotion and many other movements. Ball and socket type of joint is a type of synovial joint.
• In the ball and socket joint the ball-shaped surface of one rounded bone fits into the cup-like depression of another bone. Enarthrose refers to articulation with spherical surfaces allowing the bones to move in all directions.
• Hence ball and socket type of joint is also called enarthrose.
• So, the correct answer is 'Enarthrose'.

The elbow joint allows for flexion and extension, which is the classic movement of a hinge joint. It operates like a door hinge.

A hinge joint (ginglymus) is a bone joint in which the articular surfaces are moulded to each other in such a manner as to permit motion only in one plane-backward and forward-the extent of motion at the same time being considerable. The best examples of hinge joint are the inter phalangeal joints and the joint between the humerus and ulna; the knee and ankle-joints are less typical, as they allow a slight degree of rotation or of side-to-side movement in certain positions of the limb. The knee is the largest hinge joint in the human body.

The moving bone rotates within a ring that is formed from a second bone and adjoining ligaments. The pivot joint is exemplified by the joint between the atlas and the axis directly under the skull which allows for turning of the head from side to side.

Ball and socket joint is a natural or manufactured joint or couplings, such as the hip joint, in which partially spherical lies in a socket, allowing multidirectional movement and rotation.

The pleura refers to the two membranes that cover the lungs. The space between the two membranes is called the pleural cavity. It is filled with a thin, lubricating liquid called pleural fluid, which acts as a lubricant and allows the pleurae to slide effortlessly against each other by reducing friction during respiratory movements. So, the correct option is 'pleura'.

So, the correct option is 'Hinge joint-hip'.