Page 15 - Human anatomy COMPLETELY DONE1

Figure 9.

One myofibrill consists of many consecutive sarcomeres, and in one cell there
are many parallel myofibrils. The muscle cell itself is called myositis.
Myocytes – muscle cells – are also called muscle fibers.
Muscle fibers are grouped into bundles of muscle fibers. Several bundles together
with auxiliary structures form a muscle.
The muscle is covered with a shell of connective tissue and is attached to the
bone by means of a tendon. Some muscles can attach to the bone at one end, and the
other to organs (eye, skin).
Thus, the structural basis of skeletal muscles is striated muscle tissue, which
consists of multinucleated cells having the form of transversely striated fibers capable
of changing their length, that is, to shrink. It is this tissue that forms the part of the
muscle called the abdomen. The fibers are collected in bundles, each bundle is covered
with a sheath of connective tissue. The bundles, in turn, are assembled into skeletal
muscle and are also covered with a common connective tissue membrane - fascia.
SKELETAL MUSCLE GROUPS
The muscles of the human body are divided according to their location in the
body. The muscles of the head are divided into masticatory and mimic functions.
The masticatory muscles are attached at one end to the bones of the skull, the
other to the lower jaw. They are necessary for mechanical grinding and mixing of food,
that is, for chewing it.
The facial muscles are attached with one end to the front of the skull, and with the other
to the inner surface of the facial skin. The circular muscles of the mouth and eyes are
an exception among skeletal muscles, they are not attached to bones. The facial muscles
open and close the eyes, give the face a certain expression, and also serve to pronounce
some sounds. You can see Human Muscular System, labeling on the front and from
back view (figure 10).

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