199
CHAPTER SEVEN
Skeletal System
(b)
(c)
(d)
(e)
(f)
(a)
Cartilaginous
model
Calcified
cartilage
Articular
cartilage
Developing
periosteum
Compact bone
developing
Primary
ossification
center
Medullary
cavity
Medullary
cavity
Medullary
cavity
Secondary
ossification
center
Secondary
ossification
center
Blood
vessel
Epiphyseal
plate
Remnant of
epiphyseal
plate
Remnants of
epiphyseal
plates
Epiphyseal
plates
Compact
bone
Spongy
bone
Articular
cartilage
Spongy
bone
FIGURE 7.8
Major stages (
a–d
fetal,
e
child,
f
adult) in the development of an endochondral bone. (Relative bone sizes are not to scale.)
FIGURE 7.9
Epiphyseal plate. (
a
) The cartilaginous cells of an epiphyseal plate lie in four layers, each of which may be several cells thick. (
b
) A
micrograph of an epiphyseal plate (100×).
Bone tissue
of epiphysis
Zone of
resting
cartilage
1
Zone of
proliferating
cartilage
2
Zone of
hypertrophic
cartilage
3
Zone of
calcified
cartilage
Ossified
bone of
diaphysis
4
(a)
(b)
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