Muscle fascicle

Muscle fascicle
Structure of a skeletal muscle. (Fascicle labeled at bottom right.)
Latin	fasiculus muscularis
Gray's	subject #103 373
Code	TH H3.03.00.0.00003

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

Specialized muscle fibers in the heart that 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.

See also

• Epimysium
• Endomysium
• Connective tissue in skeletal muscle

External links

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