Synovial Joints Are Classified
by Type of Movement
Six types of synovial joints make the various types of move-
ment possible:
Plane
—Back-and-forth, side-to-side. Many plane joints
are biaxial (movement in two axes). Some are triaxial
(movement in three axes).
Hinge
—Angular
opening
and
closing
movements
(uniaxial)
Types o f synovial jo in ts • Figure 5.15
Synovial joints are classified according to the types of movements they permit.
Biaxial or triaxial
Navicular
Second
cuneiform
Third
cuneiform
Trochlea
Trochlear
notch
Humerus
Ulna
a.
Plane joint between
navicular
and second
and third cuneiforms of tarsus in
foot
b. Hinge joint between trochlea of humerus and
trochlear notch of ulna
at
the elbow
Uniaxial
Radial
notch
c.
Pivot joint between head of radius and
radial
notch of ulna
140 CHAPTER 5
The Skeletal System
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