Figure 3-5.Cuboidal epithelial tissue.
is found in the tympanic membrane
(eardrum) as a single layer of cells or in
the free skin surface in multiple layers.
c. Cuboidal. This is both a secretory and
protective tissue whose cells are cubical
(fig. 3-5). It is found in the more highly
specialized organs of the body, such as
the ovary and the kidney.
2. CONNECTIVE. This is the supporting
tissue of the various structures of the body.
It has many variations and is the most
widespread tissue of the body. It is highly
vascular, surrounds other cells, encases in-
ternal organs, sheathes muscles, wraps
Figure 3-6.Areolar connective tissue.
bones, encloses joints, and provides the
supporting framework of the body. Struc-
tures of connective tissue differ widely,
ranging from delicate tissue-paper mem-
branes to strong cords and rigid bones.
Connective tissue is composed of few cells
and large amounts of intracellular material;
the reverse is true of epithelial tissue. Some
of the more predominant types of connec-
tive tissues are:
Areolar. This tissue connects the
various tissues of the organs. It is con-
tinuous throughout the body. Nerves,
blood, and lymph vessels are found in
this tissue (fig. 3-6).
Adipose. This tissue is generally called
fatty tissue. It acts as a reservoir for
energy-producing foods; helps to reduce
body heat loss because of its poor heat
conductivity; and serves as support for
various organs and fragile structures,
such as the kidneys, blood vessels, and
Osseous. This type is a dense fibrous
connective tissue that forms tendons,
ligaments, cartilage, and bone (fig. 3-7).
These tissues form the supporting
framework of the body.
Figure 3-7.Osseous (bone) tissue.