Classification of Muscles

1. BY- syed
masood

2. DEPENDING UPON STRIATIONS
STRAITED MUSCLES UN-STRAITED MUSCLES

3.  Voluntary Muscles :
Controlled by will
 In-voluntary Muscles :
Can not be controlled by will
 Skeletal Muscles
 Cardiac Muscles
 Smooth Muscles

4. FEATURES Skeletal Muscles Cardiac Muscles Smooth Muscles
Location In association with
bones
In the heart In the visceral
organs
Shape Cylindrical & un-
branched
Branched Spindle – shaped
unbranched
Nucleus Multinucleated Only one Only one
Cross striations Present Present Absent
Action Voluntary In-voluntary In-voluntary
Speed of contraction Fast Intermediate Slow
Nerve Supply Somatic Nerves Autonomic Nerves Autonomic Nerves

8. Microscopic structure of a myofibril
Each myofibril consist of a no. of two alternating
bands called sections , segments or disks.
Two bands are :
1. LIGHT BANDS OR ‘I’ BANDS
2. DARK BANDS OR ‘A’ BANDS
The portion of myofibril in b/w two ‘Z’ lines is called
SARCOMERE.