Question

The joint between humerus and radio ulna is?
A) Ball and socket
B) Pivot
C) Gliding
D) Hinge

Answer 1

Hint:Synovial joints are identified by the phrases of a joint cavity which is filled with synovial fluid between the articular surfaces of two bones. It allows smooth movement between the adjacent bones. The articulating surface of the bones are covered by a thin layer of articulating cartilage

Complete step by step answer:A) Ball and Socket - Ball and socket joints are also called the spheroidal joint. Where the rounded surface of the bone moves within a depression on another bone. It is the only joint that allows greater freedom of movement than any other type of joint in the body. This type of joint is mostly found between the numerous and pectoral girdle.
B) Pivot joint - The pivot joint is also called the rotatory joint. It is a freely movable joint that allows the rotatory movement around a single axis. It is found between the atlas and the axis which are the first and the second vertebrae respectively.
C) Gliding joint - The gliding joint is also known as the plane joint.it is the most common joint that is formed between the bones that meets at flat or nearly flat articular surfaces.it allows the bone to slide past one another in any direction along the plane of the joint. It is mostly found between the carpals.
D) Hinge joint – The hinge joint is a type of synovial joint in which the articular surfaces of the bone are molded to each other in such a manner that it permits motion only in one plane. It is mainly found between the humerus and radio ulna.
Hence D is the correct option.

Note: Articular cartilage prevents the friction between the bones at the synovial joint. It is a thin layer of hyaline cartilage that covers the entire articular surface of each bone. The articulating cartilage acts like a Teflon coating over the surfaces of the bone.