249
8
Joints
Classification of Joints
(pp. 249–250)
Fibrous Joints
(pp. 250–251)
Sutures (p. 250)
Syndesmoses (p. 250)
Gomphoses (p. 251)
Cartilaginous Joints
(pp. 251–252)
Synchondroses (p. 251)
Symphyses (pp. 251–252)
Synovial Joints
(pp. 252–269)
General Structure (pp. 252–253)
Bursae and Tendon Sheaths (p. 253)
Factors Influencing the Stability
of Synovial Joints (pp. 255–256)
Movements Allowed by Synovial Joints
(pp. 256–258)
Types of Synovial Joints (p. 258)
Selected Synovial Joints (pp. 262–269)
Homeostatic Imbalances of Joints
(pp. 269–272)
Common Joint Injuries (pp. 269–270)
Inflammatory and Degenerative
Conditions (pp. 270–272)
Developmental Aspects of Joints
(pp. 272–273)
T
he graceful movements of ballet dancers and the rough-and-tumble
grapplings of football players demonstrate the great variety of motion allowed by
joints
, or
articulations
—the sites where two or more bones meet. Our joints have
two fundamental functions: Tey give our skeleton mobility, and they hold it together,
sometimes playing a protective role in the process.
Joints are the weakest parts of the skeleton. Nonetheless, their structure resists various
forces, such as crushing or tearing, that threaten to force them out of alignment.
Classification of Joints
Define joint or articulation.
Classify joints by structure and by function.
Joints are classified by structure and by function. Te
structural classification
focuses on
the material binding the bones together and whether or not a joint cavity is present. Struc-
turally, there are
fibrous
,
cartilaginous
, and
synovial joints
(
Table 8.1
on p. 253).
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