Chapter 9: Joints Flashcards
any point where two bones meet, whether or not the bones are movable at that interface
joint (articulation)
how are joint names derived?
typically derived from the names of the bones involved
how are joints classified?
according to the amount of movement allowed and the manner in which the bones are bound to each other
immovable joints are called
synarthroses
slightly movable joints are called
amphiarthroses
freely movable joints are called
diarthroses
what are the 4 major joint categories?
bony, fibrous, synovial, cartilaginous joints
another name for a bony joint
synostosis
immobile joint formed when the gap between two bones ossifies and the bones become, in effect, a single bone; can either occur in fibrous or cartilaginous joints
synostosis
another name for fibrous joint
synarthrosis/synarthrodial joint
adjacent bones are bound by collagen fibers that emerge from one bone and penetrate into the other
fibrous joints
what are the three kinds of fibrous joints?
sutures, gomphoses, syndesmoses
immobile or slightly mobile fibrous joints in which short collagen fibers bind the bones of the skull to each other
sutures
attachment of a tooth to its socket; held in place by fibrous periodontal ligament
gomphosis
fibrous joint at which two bones are bound by long collagen fibers
syndesmosis
example of very mobile syndesmosis
interosseus membrane
example of less mobile syndesmosis
joint between tibia and fibula
another name for a cartilaginous joint
amphiarthroses
what are the two kinds of cartilaginous joints?
synchondroses and symphyses
what cartilage is used in synchondrosis?
hyaline cartilage
what are examples of synchondrosis?
temporary joints in the epiphyseal plates in children, first rib attachment to sternum
what kind of cartilage is used for symphysis
fibrocartilage
what are examples of symphysis?
pubic symphysis joining the right and left pubic bones with interpubic disc; bodies of vertebrae joined by intervertebral discs
joint in which two bones are separated by a joint cavity
synovial joint
what is another name for synovial joints?
diarthrosis/diarthrodial joint
what is the most familiar type of joint?
synovial
what joint is most structurally complex?
synovial
slippery lubricant in joint cavity; rich in albumin and hyaluronic acid; like raw egg whites
synovial fluid
the degrees through which a joint can move; aspect of joint performance; physical assessment of a patient’s joint flexibility
range of motion
what is range of motion determined by?
structure of the articular surfaces, strength and tautness of ligaments and joint capsules, action of the muscles and tendons; muscle tone
shoulder has three degrees of freedom or axes of rotation
multiaxial joint
how many classes of synovial joints exist
6 classes
smooth, hemispherical head fits within cup like socket, only multiaxial joints in body
ball and socket joints
oval convex surface of one bone fits into a complementary shaped depression on the other; biaxial joint
condylar; ellipsoid joints