Chapter 4
Tissue: The Living Fabric
131
4
(a)
Connective tissue proper: loose connective tissue, areolar
Description:
Gel-like matrix with all three fiber
types; cells: fibroblasts, macrophages, mast
cells, and some white blood cells.
Function:
Wraps and cushions organs; its
macrophages phagocytize bacteria; plays
important role in inflammation; holds and
conveys tissue fluid.
Location:
Widely distributed under epithelia
of body, e.g., forms lamina propria of mucous
membranes; packages organs; surrounds
capillaries.
Photomicrograph:
Areolar connective tissue, a soft packaging
tissue of the body (340
m
).
Epithelium
Lamina
propria
Fibroblast
nuclei
Elastic
fibers
Collagen
fibers
Ground
substance
Figure 4.8
Connective tissues.
(a)
and
(b)
Connective tissue proper. (For related images,
see
A Brief Atlas of the Human Body
, Plates 11 and 12.)
(b)
Connective tissue proper: loose connective tissue, adipose
Description:
Matrix as in areolar, but very
sparse; closely packed adipocytes, or fat cells,
have nucleus pushed to the side by large fat
droplet.
Function:
Provides reserve food fuel;
insulates against heat loss; supports and
protects organs.
Location:
Under skin in subcutaneous tissue;
around kidneys and eyeballs; within abdomen;
in breasts.
Photomicrograph:
Adipose tissue from the subcutaneous
layer under the skin (350
m
).
Nucleus of
adipose
(fat) cell
Fat droplet
Adipose
tissue
Mammary
glands
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