66
UNIT 2
Basic Tissues
Figure 4-8A.
A representation of the elastic ± bers in dense
connective tissue.
Elastic ± bers
are thinner than collagen f
bers and are
interspersed among
collagen ±
bers
. They are composed oF
elastin
and
micro± brillar
proteins
and are specialized For
stretch and resilience.
Figure 4-8B.
Elastic ±
bers, skin.
Elastic stain,
3
408
An example oF
elastic ± bers
in dense connective tissue oF the der-
mis oF the skin is shown. The elastic f
bers stain dark with the
special stain used in this section.
Collagen ±
bers
appear as thick,
pink bundles.
Figure 4-9A.
A representation of elastic laminae in a large
artery.
Shown is an example oF another Form oF elastic f bers in a
large artery, called
elastic laminae
(
elastic membranes
). Elastic
laminae, as well as
reticular
and
collagen ± bers
, are produced
by
smooth muscle cells
in the walls oF the artery. The collagen
f
bers, reticular f bers, and
ground substance
lie between the
elastic laminae. Smooth muscle cells are interspersed between
the f
ber layers.
Figure 4-9B.
Elastic laminae, elastic artery.
H&E,
3
426
An example oF
elastic laminae
in an elastic artery is shown. The
elastic material is arranged in parallel wavy sheets (
lamellar form
)
instead oF f
bers. The
elastin
is eosinophilic and appears red with
H&E stain.
Smooth muscle cells
are interspersed between the
elastic laminae. Elastic laminae in the large arteries are able to
stretch, allowing these vessels to distend and recoil during the
cardiac cycle (see ±ig. 4-20A).
D. Cui
Collagen fiber
Ground substance
Elastic fiber
Fibroblast
A
B
Collagen fiber
Collagen fiber
Elastic fibers
Elastic fibers
Collagen fiber
Elastic fibers
D. Cui
Ground substance
Collagen fiber
Reticular fiber
Smooth muscle
cell
Elastic laminae/
elastic membranes
A
Elastic laminae
Elastic laminae
Elastic laminae
Smooth muscle cells
Smooth muscle cells
Smooth muscle cells
B
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