There are three main types of muscles in the body: skeletal, cardiac, and smooth muscles. Skeletal muscle forms about 40% of body weight and is found in the limbs and body wall. It is voluntary muscle that contracts to enable movement. Cardiac muscle is only found in the heart and resembles smooth muscle in being involuntary, but shows striations like skeletal muscle. Smooth muscle is mainly associated with viscera and does not show striations. It is involuntary muscle. Skeletal muscle is composed of bundles of elongated cells called muscle fibers surrounded by connective tissue sheaths.

1. MUSCULOSKELETAL SYSTEM-
MUSCULAR SYSTEM
BY TANISHK GAUR

2. INTRODUCTION
• There are total 650 muscles in our body. Muscles
tissue is composed of cells that are specialized to
shorten in length by contraction. This contraction
results in movement.
• Muscles is an excitable tissue responsible for
most of or functions like locomotion, posture,
speech etc.
• Muscle tissue is made up of cells called myocytes
or muscles fibres.

3. CLASSIFICATION OF MUSCLES
• There are three types of muscles:
• 1.Skeletal muscle
• 2.Cardiac muscle
• 3.Smooth muscle

4. SKELETAL MUSCLES
• It is present in limbs and body wall. They, form
about 40% of the total body weight. They
show transverse striations. They also called
striated muscle .It is also called voluntary
muscle. It is supplied by somatic motor nerve.
FUNCTIONS
• 1Contraction
• 2.Elasticity
• 3.Maintenance of posture

5. CARDIAC MUSCLE
• It is present exclusively in Heart .It resembles
smooth muscle in being involuntary ; but it
resembles striated muscle in that the fibre of
cardiac muscle also show transverse striations.
Cardiac muscle is supplied by autonomic nerves.
SMOOTH MUSCLES
It is present mainly in relation to viscera .It is seen
most typically in the walls of hollow viscera do
not show transverse striations. It is also called
non striated muscle and involuntary muscle .It is
supplied by autonomic nerves.

6. STRUCTURE OF SKELETAL MUSCLE

7. ORGANIZATION
A Skeletal muscles is composed of numerous elongated cell
muscle Fibres. These fibres are arranged in bundles called
FASCICULI.

8. ENDOMYSIUM
PERIMYSIUM,EPIMYSIUM
• Each fibre is surrounded by loose areolar
connective tissue sheath called endomysium
• Each fasciculus is covered by a stronger
connective tissue sheath called perimysium
• The whole muscle is enveloped by a tough
connective tissue sheath, the epimysium