Answer to Question #124679 in Biology for Dan

Question

Please describe what each of these bones are and do.
fixed joint, pivot joint, synovial joint, ball and socket joints and hinge joint

Thank you.

Answer 1

Fixed joint are joints that provide stability to certain bones and parts of the body. They include the bones of the skull and pelvis.

The pivot joint is a freely moveable joint providing rotary movements around a single axis, the joint between C1 and C2 vertebrates.

Ball and socket joints are characterized by the highest freedom of motion comprising flexion-extension, circumduction, and abduction-adduction, for instance, hip joint.

Hinge joint consists of two or three bones surfaces and allows bones to move in one direction (back and forth). The example is the elbow joint.