An introduction of muscles of body

1. MUSCULAR SYSTEM
The muscular system is responsible for the movement of the human
body.
Muscle is the tissue of the body which primarily functions as a source of
power
The main function of the muscular system is movement.
Muscles are the only tissue in the body that has the ability to contract
and therefore move the other parts of the body.
It permits movement of the body, maintains posture, and circulates blood
throughout the body.

3. There are approximately 640 muscles in the human body.
. The muscular system is composed of specialized cells
called muscle fibers.
Their predominant function is contractibility. Muscles,
attached to bones or internal organs and blood vessels,
are responsible for movement.

4. CLASSIFICATION OF MUSCLES
SKELETAL
MUSCLE
SMOOTH
MUSCLE
CARDIAC
MUSCLE

6. SKELETAL MUSCLE
Skeletal muscle is striated muscle tissue that is attached to
bones.
These are also called voluntary muscle because there is
conscious control over it.
These muscle are attached to bone via tendons , are used
to move the skeleton.
Also called Striped or striated muscle because banded
pattern of the cells are seen under the microscope.

8. SMOOTH MUSCLE(VISCERAL MUSCLE)
Smooth muscles are involuntary muscle is not under
conscious control.
These cells are small, have one nucleus and spindle
shaped.
These are non-striated because they do not have a striped
appearance under the microscope.
These are found in the walls of hollow organs.

9. Smooth muscle forms sheets in the walls of hollow organs
and tubular structure to regulate diameter and propel
substance through tracts.
Contraction of the smooth muscle is slower and more
sustained than skeletal muscle.
These are innervated by the branches of autonomic
nervous system.

11. CARDIAC MUSCLE
These types of muscle tissue is found only in the heart wall .
It is not under conscious control so it is involuntary .
These are striated muscle.
Each fibre( cell) has a nucleus and one or more branches.
Also known as myocardium.

12.  Cardiac muscle tissue or myocardium forms
the bulk of the heart.
 Cardiac muscle cells or cardiomyocytes are
the contracting cells which allow the heart to
pump.

14. MICROSCOPIC ANATOMY OF SKELETAL MUSCLE
Endomysium: Each muscle fibre is surrounded by
delicate connective tissue called endomysium.
Perimysium: Individual fasciculi are enclosed by a
stronger sheath of connective tissue called perimysium.
Epimysium: The entire muscle is surrounded by
connective tissue called epimysium.

16.  The microscopic anatomy of the
skeleton muscle have alternating
light(I) and dark(A) bands. Light band
has a darker area called Z disc and
Dark band has a lighter area called
“H” zone. These gives muscle cells its
striped appearance.

18.  Fascicle: These are discrete bundle of muscle
cells.
 Myofilament: Actin myosin containing
structure.
 Myofibril: A long, filamentous structure found
within the muscle cells.
 Sarcolemma: Plasma membrane of the
muscle cells.
 Sarcomere: Contractile unit of the muscle.

19.  Sarcoplasm: Cytoplasm of the striated
muscle cells.
 Myofilament: Smaller structure produce
banding pattern within sarcomere.