282
UNIT TWO
4. Knee joint
a. The knee joint includes two condylar joints
between the femur and the tibia and a plane joint
between the femur and the patella.
b. Ligaments and tendons strengthen the thin joint
capsule.
c. Several ligaments, some in the joint capsule, bind
articular surfaces.
d. Two menisci separate the articulating surfaces of
the femur and the tibia.
e. Several bursae are associated with the knee joint.
f. The knee joint permits fl
exion and extension;
when the lower limb is fl
exed at the knee, some
rotation is possible.
8.7
LIFE-SPAN CHANGES (PAGE 278)
1. Joint stiffness is often the earliest sign of aging.
a. Collagen changes cause the feeling of stiffness.
b. Regular exercise can lessen the effects.
2. Fibrous joints are the ±
rst to begin to change and
strengthen over a lifetime.
3. Synchondroses of the long bones disappear with
growth and development.
4. Changes in symphysis joints of the vertebral column
diminish fl
exibility and decrease height.
5. Over time, synovial joints lose elasticity.
b. A cylindrical joint capsule envelops the joint.
(1) The capsule is loose and by itself cannot keep
the articular surfaces together.
(2) It is reinforced by surrounding muscles and
tendons.
c. Several ligaments help prevent displacement of the
bones.
d. Several bursae are associated with the shoulder
joint.
e. Its parts are loosely attached, so the shoulder joint
permits a wide range of movements.
2. Elbow joint
a. The elbow has a hinge joint between the humerus
and the ulna and a plane joint between the
humerus and the radius.
b. Collateral ligaments reinforce the joint capsule.
c. A synovial membrane partially divides the joint
cavity into two portions.
d. The joint between the humerus and the ulna
permits fl
exion and extension only.
3. Hip joint
a. The hip joint is a ball-and-socket joint between the
femur and the hip bone.
b. A ring of ± brocartilage deepens the cavity of the
acetabulum.
c. The articular surfaces are held together by a heavy
joint capsule reinforced by ligaments.
d. The hip joint permits a wide variety of movements.
8.1 Introduction
1
Functions of joints include ___________________ . (p. 261)
a. binding skeletal parts
b. allowing for bone growth
c. permitting the skeleton to change shape during child-
birth
d. enabling movement in response to skeletal muscle
contractions
e. all of the above.
8.2 Classif
cation oF Joints
2
Describe how joints are classi±
ed. (p. 261)
3
Compare the structure of a ±
brous joint with that of a
cartilaginous joint. (p. 261)
4
A ______________ is a ±
brous joint with bones bound by
long connective tissue ±
bers, whereas a ______________
is a ±
brous joint where ²
at bones are united by a thin
layer of connective tissue. (p. 261)
5
Describe a gomphosis, and name an example. (p. 262)
6
Compare the structures of a synchondrosis and a
symphysis. (p. 262)
7
Explain how the joints between vertebrae permit
movement. (p. 262)
CHAPTER ASSESSMENTS
8.3 General Structure oF a Synovial Joint
8
Draw the general structure of a synovial joint, labeling all
the main parts. (p. 263)
9
Describe how a joint capsule may be reinforced. (p. 264)
10
Explain the function of a synovial membrane. (p. 264)
11
Explain the function of synovial ²
uid. (p. 264)
12
De±
ne
meniscus.
(p. 265)
13
De±
ne
bursa.
(p. 265)
8.4 Types oF Synovial Joints
14
Describe the six types of synovial joints, and name an
example of each type. (p. 265)
15
Describe the movements permitted by each type of
synovial joint. (p. 265)
8.5 Types oF Joint Movements
16
Joint movements occur when a muscle contracts and
the muscle ±
bers pull the muscle’s movable end of
attachment, the ____________________ , toward its ±
xed
end, the ______________________ . (p. 267)
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