The muscular system The muscular system moves the body. The body has almost 700 muscles, each of which consists of special fibers that can contract. When a muscle contracts, it pulls the tissue to which it is attached.this pulling results in movement. Muscle is the tough, elastic tissue that makes body parts move. All animals except the simplest kinds have some type of muscle.
The Muscular System
The Muscular System moves the
body. The body has almost 700
muscles, each of which consists of
special fibers that can contract. When
a muscle contracts, it pulls the tissue
to which it is attached. This pulling
results in movement.
Muscle is the tough, elastic tissue that
makes body parts move. All animals except the
simplest kinds have some type of muscle.
Muscles are found throughout the body.
As a person grows, the muscle also get bigger.
Muscle makes up nearly half the body weight of an
KINDS OF MUSCLES
Are attached to the bones. They move the
bones of the arms, fingers, legs and other parts of the
skeleton. We can consciously control the skeletal
muscles, and so they are known as voluntary
muscles. The fibers that make up a skeletal muscle
have alternate light and dark cross bands called
striations. Muscles move the body only by pulling.
They usually move voluntarily and also may move
Are found in most in the body’s internal organs.
Unlike skeletal muscles, smooth muscles do not have
striations. Smooth muscles in the walls of the stomach and
intestines move food through digestive system. In all these
cases, the smooth muscles contract and relax automatically-
that is, we do not consciously control them. For this reason,
they are often called involuntary muscles. Smooth muscles
can thus produce powerful, rhythmic contractions over long
Smooth muscles are found in various
organs of the body. They also are smaller than
skeletal muscle fibers and have only one
nucleus. Smooth muscles operate slowly and
automatically in natural, rhythmic pattern of
contraction followed by relaxation.
Cardiac muscle is a third kind of
muscle that only found in the heart. It has
feature of both skeletal and smooth
muscle. Cardiac muscle makes up the
wall of the heart. When its cells contract,
they push blood out of the heart and into
Cardiac muscle has striations like skeletal
muscle, but like smooth muscle, it contracts
automatically and rhythmically without tiring.
Cardiac muscle enables the heart to beat an
average of 70 times a minute without rest
throughout a person’s lifetime.
FRONTALIS - the muscle of
the forehead that forms part
of the occipitofrontalis —
called also Frontalis Muscle
TRAPEZIUS - a large flat
triangular superficial muscle of
each side of the upper back
DELTOID - a large muscle
of the shoulder
PECTORALIS - either of the
muscles that connect the
ventral walls of the chest with
the bones of the upper arm
and shoulder of which in
humans there are two on
TRICEPS BRANCHII - the skeletal
muscle having three origin that
extends the forearm when it
BICEPS BRANCHII - a muscle that
flexes and supinates the forearm
LATISSIMUS DORSI - a broad, flat
muscle on each side of the middle of
the back. The action of which draws
the arm backward and downward
ABDOMINAL MUSCLES - the
muscles between the throax and the
pelvis supporting the abdominal wall.
GLUTEUS MAXIMUS - the
largest of the three flat buttock or
rump muscles. The gluteal muscle
arise from the back of the pelvis
and are inserted into the back of
the upper part of the thigh
BICEPS FEMORIS - one of the
posterior femoral muscles. It has
two heads as its origin.
RECTUS FEMORIS - a fusiform
muscle of the anterior thigh, one
of the four parts of the
quadriceps femoris. With the
quadriceps group it functions to
extend the lower leg.
GASTROCNEMIUS - superficial
muscle of posterior (plantar
flexor) compartment of leg; by
two heads (lateral and medial)
from the lateral and medial
condyles of the femur; insertion,
with soleus by tendo, calceneus
into lower half of posterior
surface of calcaneus; action
plantar flexion of foot; nerve
ACHILLES TENDON - the strong
tendon at the back of the heel that
connects the calf muscle ( triceps
surae muscle) to the heel bone.
The name is derived from the
legend of the Greek hero Achilles,
who was vulnerable only in one
heel. A large tendon conecting the
heel bone to calf muscle of the leg
DISORDERS OF THE MUSCLES
Muscles function through an amazing coordination of
many elements. Occasionally, however, the normal operation of
muscles is disturbed.
Is a painful, uncontrolled contraction of one or more
muscles. It may involve any muscular area of the
body. Cramps can occur either in skeletal muscles or
in smooth muscles.