Muscle Tissue Histology

.docx AP02 Structure and Ultrastructure Muscle, .pdf AP02 Montage Muscle Tissues, .pdf Histology of Muscle slides

Classification:

• Unicellular
• Multicellular (Major)

All of Mesodermal Origin.

Muscle Type Characteristics

Skeletal

A) Muscle fibre B) External Lamina C) Nuclei

Longitudinal Section

Transverse section, Polygonal, Nuclei pushed to periphery; just beneath Sarcolemma.

• Spindle - Detects state of contraction, regulates muscle tone
• Muscle>Fasciculi>Muscle fibre>Myofibril>Sarcomere>Myofilaments
• Fasciculi size depends on function of muscle tissue. Fine, controlled: Small fasciculi, large amounts of perimysium. Gross, movements: Large fasciculi, little perimysium.
• Skeletal Muscle Types:
• Satellite Cells
• Tendons - Join muscles to Periosteum, aid in transforming contraction to movement of bone. Confluence of contraction, tying together forces of multiple myofibrils
• Sarcomere Structure