Fasciculi
Fascicle or ''fasciculus'' may refer to: Anatomy and histology * Muscle fascicle, a bundle of skeletal muscle fibers * Nerve fascicle, a bundle of axons (nerve fibers) ** Superior longitudinal fasciculus *** Arcuate fasciculus ** Gracile fasciculus ** Cuneate fasciculus ** Dorsal longitudinal fasciculus ** Medial longitudinal fasciculus ** Flechsig's fasciculus *Fascicular pattern of histopathologic architecture Botany * Fascicle (botany), a cluster of flowers or leaves, such as the bundles of the thin leaves (or needles) of pines * A discrete bundle of vascular tissue Other uses * ''Fasciculus'', a fossil comb jelly * ''Fasciculus Chemicus'', a 17th-century anthology of alchemical writings * Fascicle (book) In literature, a serial is a printing or publishing format by which a single larger work, often a work of narrative fiction, is published in smaller, sequential instalments. The instalments are also known as ''numbers'', ''parts'' or ''fascicle ...

Muscle Fascicle
A muscle fascicle is a bundle of skeletal muscle fibers surrounded by perimysium, a type of connective tissue. Structure Muscle cells are grouped into muscle fascicles by enveloping perimysium connective tissue. Fascicles are bundled together by epimysium connective tissue. Muscle fascicles typically only contain one type of muscle cell (either type I fibres or type II fibres), but can contain a mixture of both types. Function In the heart specialized cardiac muscle cells transmit electrical impulses from the atrioventricular node (AV node) to the Purkinje fibers – 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. Clinical significance Myositis may cause thickening of the muscle fascicles. This may be detected with ultrasound scans. Muscle fasci ...
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