Muscle fascicle

Muscle fascicle

Muscle fascicle
Structure of a skeletal muscle. (Fascicle labeled at bottom right.)
Latin fasiculus muscularis
Code TH H3.
Anatomical terminology

In anatomy, a muscle fascicle is a bundle of skeletal muscle fibers surrounded by perimysium, a type of connective tissue. (There is also a nerve fascicle of axons.)

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

External links

  • Histology image: 77_04 at the University of Oklahoma Health Sciences Center - "Slide 77 skeletal muscle"
  • - "Smooth Muscle"
  • Diagram at