histology of types of muscles

1. M.Sc Clinical Embryology
Subject: Histology
By – Prachi Naik
Muscular tissue

2. • In human, all the body cells have a property of the contractility to some
extent. The property of contractility is well developed in muscular tissue.
• The cells of muscular tissue are called Myocytes. As the myocytes are
elongated or spindle shaped, they are also called muscle fibers.
• The plasma membrane of a skeletal muscle fiber is called
the sarcolemma.
• The striated appearance of skeletal muscle tissue is a result of
repeating bands of the proteins actin and myosin that are present
along the length of myofibrils.
• Dark A bands and light I bands repeat along myofibrils, and the
alignment of myofibrils in the cell causes the entire cell to appear
striated or banded.
Muscle Tissue

6. Types of Muscular Tissue
• There are three types of muscles:

7. • Muscle fiber: Very long, unbranched cylindrical
• Nuclei: Multinucleated, peripherally placed, flat
• Striations: Well defined cross-striation
• Sacroplasmic reticulum: Form traids
• T-tubules: Present at A-I junction
• Cell junction: Absent
• Function: Voluntary
• Innervation: Motor nerves
• Mitosis: None
• Regeneration after injury: Limited
• Location: Skeletal muscles, tongue, esophagus, diaphragm
Skeletal Muscle

9. • Muscle fiber: Small, branched cylindrical
• Nuclei: Single, centrally placed, oval
• Striations: Poorly defined cross-striations
• Sacroplasmic reticulum: Form diads
• T-tubules:Present at Z-line
• Cell junction: Intercalated discs
• Function: Involuntary
• Innervation: Autonomic nerves
• Mitosis: None (new concept: Limited)
• Regeneration after injury: None
• Location: Heart, superior and inferior vena cava, pulmonary vei
Cardiac Muscle

11. • Muscle fiber: Small, unbranched spindle shaped
• Nuclei: Single, centrally placed, elongated
• Striations: Absent
• Sacroplasmic reticulum: Not well developed
• T-tubules: Absent
• Cell junction: Gap junction
• Function: Involuntary
• Innervation: Automatic nerves
• Mitosis: Present
• Regeneration after injury: Present
• Location: Vessels, tubular viscera, and organs
Smooth Muscle

13. Summary

14. Thank You