86
UNIT 2
Basic Tissues
Figure 5-5A.
A representation of elastic cartilage.
Elastic cartilage
has a rich network of
elastic ±
bers
, which
gives its matrix a rough appearance. It also contains deli-
cate
collagen type II ±
bers
and ground substance in the
matrix, as do other types of cartilage. In general,
chondro-
cytes
are more abundant in elastic cartilage than in hya-
line cartilage and F
brocartilage. Cartilage growth in elastic
cartilage includes
appositional growth
,
which requires a
perichondrium, and
interstitial
growth
, indicated by
isog-
enous groups
(see ±ig. 5-7). Elastic cartilage provides fl
ex-
ible support for tissue and is located in the areas where
fl exible stretching is required, such as the epiglottis, larynx,
pinna of the ear, and the auditory canal and tube.
D. Cui /T. Yang
Chondrocyte in lacuna
Elastic fiber
Type II collagen fiber
Isogenous group
Chondroblast
Perichondrium
A
B
Elastic fibers
Elastic fibers
Elastic fibers
Perichondrium
Perichondrium
Perichondrium
Chondrocyte
Chondrocyte
Chondrocyte
Elastic fibers
Elastic fibers
Elastic fibers
Isogenous
Isogenous
group
group
Isogenous
group
Perichondrium
Perichondrium
Perichondrium
C
Chondrocytes
Chondrocytes
Chondrocytes
Elastic fibers
Elastic fibers
Elastic fibers
Isogenous
Isogenous
group
group
Isogenous
group
Elastic fibers
Elastic fibers
Elastic fibers
Figure 5-5B.
Elastic cartilage, epiglottis.
H&E,
3
68;
inset
3
218
An example of
elastic cartilage
in the epiglottis is shown.
Elastic cartilage has a
perichondrium
surrounding it as
does most hyaline cartilage. The perichondrium protects
and provides blood supply for the cartilage tissue. Chon-
drogenic cells and
chondroblasts
in the perichondrium
layer are responsible for appositional growth of the matrix.
There are abundant
elastic ± bers
and type II collagen F
bers
in the extracellular matrix.
Isogenous groups
are created
by the division of existing cells. The resulting daughter cells
that are derived from a single progenitor cell stay in the
same lacuna. Elastic cartilage has both
interstitial growth
,
which is indicated by the presence of isogenous groups,
and
appositional
growth
, for which a perichondrium is
required (±ig. 5-7).
Figure 5-5C.
Elastic cartilage, epiglottis.
Elastic F
ber
stain,
3
68; inset
3
208
An example of
elastic cartilage
in the epiglottis is shown.
Elastic cartilage is composed of thick, branching
elastic
± bers
with a slight network of
collagen ± bers
and
chon-
drocytes
F lling the interstitial space. Elastic cartilage can
be found in the epiglottis and pinna of the ear. Elastic F
bers
presented here with a special stain are seen as thick, dark,
elongated proF
les. Chondrocytes are arranged in individ-
ual and
isogenous groups
among the elastic F
bers in the
matrix.
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