CHAPTER 5
Cartilage and Bone
85
Figure 5-4.
Hyaline cartilage and chondrocytes.
EM,
3
6,300
When
chondroblasts
of the perichondrium have surrounded themselves with matrix and become embedded in a hyaline cartilage,
they are called
chondrocytes
, the cells seen in this electron micrograph. These chondrocytes are still active in synthesizing matrix
proteins as indicated by their abundant
rough endoplasmic reticulum
(
RER
) and by the presence of nucleoli and
euchromatin
in
their nuclei. Evidence of recent cell divisions is seen in the form of
isogenous groups
, three of which are circumscribed by
dotted
lines
. The meshwork of F laments in the matrix is
type II collagen
, which does not aggregate to form F
bers.
Interterritorial
Interterritorial
matrix
matrix
Type II
Type II
collagen fibrils
collagen fibrils
Type II
collagen fibrils
Interterritorial
matrix
Lacuna
Lacuna
Territorial
Territorial
matrix
matrix
Lacuna
Territorial
matrix
Territorial
Territorial
matrix
matrix
Territorial
matrix
Interterritorial
Interterritorial
matrix
matrix
Interterritorial
matrix
Euchromatic
nucleus
Rough
endoplasmic
reticulum (RER)
Nuclei
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