Joint+types

By: Kimanh Nguyen

A joint is a place where one bone attaches to another bone.



Joint types include:
 * 1) Hinge
 * 2) Pivot
 * 3) Saddle (The diagram calls it ellipsoidal.)
 * 4) Ball-and-socket
 * 5) Immovable

Functions:

v Hinge


 * Ø Flexes in only one direction
 * Ø Permits back and forth motion
 * § Example: Knee

v Pivot


 * Ø Allows one bone to rotate around another
 * § Example: neck

v Saddle


 * Ø Allows one bone to slide in two directions
 * § Example: fingers

v Ball-and-socket


 * Ø Permit movement in many directions (widest range of movement of any joint)
 * § Examples: shoulders and hips

v Immovable (a.k.a. fixed joints)


 * Ø Allows for no movement
 * § Example: skull