Muscle fascicle
| Muscle fascicle | |
|---|---|
 Structure of a skeletal muscle. (Fascicle labeled at bottom right.) | |
| Details | |
| Part of | Skeletal muscle |
| Identifiers | |
| Latin | fasiculus muscularis |
| TA2 | 2006 |
| TH | H3.03.00.0.00003 |
| Anatomical terminology | |
A muscle fascicle is a bundle of skeletal muscle fibers surrounded by perimysium, a type of connective tissue.[1]
Structure
type II fibres), but can contain a mixture of both types.[2]
Function
In the
atrioventricular node (AV node) to the Purkinje fibers – fascicles, also referred to as bundle branches.[citation needed] 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.
Clinical significance
Myositis may cause thickening of the muscle fascicles.[3] This may be detected with ultrasound scans.[3]
Muscle fascicle structure is a useful diagnostic tool for dermatomyositis. Myocytes towards the edges of the muscle fascicle are typically narrower, while those at the centre of the muscle fascicle are a normal thickness.[4]
Muscle fascicles may be involved in myokymia, although commonly only individual myocytes are involved.[5]
See also
- Connective tissue in skeletal muscle
- Endomysium
- Epimysium
References
- ^ ISBN 978-0-323-05594-9, retrieved 2020-11-04
- ISBN 978-0-12-547626-3, retrieved 2020-11-04
- ^ ISBN 978-1-4377-0127-2, retrieved 2020-11-04
- ISBN 978-0-323-05712-7, retrieved 2020-11-13
- PMID 21907081, retrieved 2020-11-13
External links
- Histology image: 77_04 at the University of Oklahoma Health Sciences Center – "Slide 77 skeletal muscle"
- Anatomy Atlases – Microscopic Anatomy, plate 05.83 – "Smooth Muscle"
- Diagram at kctcs.edu
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