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Muscle fascicle
Image:Illu muscle structure.jpg
Structure of a skeletal muscle. (Epimysium labeled at bottom center.)
Gray's	subject #103 373

In anatomy, a fascicle is a bundle of skeletal muscle fibers surrounded by connective tissue.

Specialized muscle fibers in the heart which transmit electrical impulses from the Atrioventricular Node (AV Node) to the Purkinje Fibers are fascicles, also referred to as bundle branches. These start as a single fascicle of fibers at the AV node called the Bundle of His that then splits into three bundle branches: the right fascicular branch, left anterior fascicular branch, and left posterior fascicular branch.

[edit] External links

• Dictionary at eMedicine Fascicle
• Histology at OU 77_04 - "Slide 77 skeletal muscle"
• Anatomy Atlases - Microscopic Anatomy, plate 05.83 - "Smooth Muscle"
• Diagram at kctcs.edu

Muscle tissue v • d • e</div>

skeletal muscle/general: epimysium, fascicle, perimysium, endomysium, muscle fiber, myofibril sarcomere (a, i, and h bands; z and m lines), myofilaments (thin filament/actin, thick filament/myosin, elastic filament/titin), tropomyosin, troponin neuromuscular junction, intrafusal muscle fibers, extrafusal muscle fiber, motor unit, muscle spindle, sliding filament mechanism myoblast, satellite cells, sarcoplasm, sarcolemma, sarcoplasmic reticulum, T-tubule cardiac muscle: myocardium, intercalated disc smooth muscle: calmodulin, vascular smooth muscle