Definition

1. Noun:
   • A small bundle or cluster of anatomical fibers, especially nerve or muscle fibers: In anatomy and neurology, a fasciculus is a discrete, organized collection of fibers (axons in nerves or myofibrils in muscles) bound together by connective tissue.

Examples of Usage

• Noun:
  • The corticospinal tract is a major fasciculus that transmits motor signals from the brain to the spinal cord.
  • Under the microscope, you can observe each muscle fasciculus surrounded by perimysium.

Advanced Usage

• Specific Anatomical Names: The term is often part of the proper names for specific nerve tracts in the central nervous system.
  • The arcuate fasciculus is a bundle of axons that connects Broca's area and Wernicke's area in the brain.
• In Pathology: Used to describe the condition or appearance of fiber bundles.
  • The biopsy showed degeneration of the muscle fasciculi.

Variants and Related Words

• Fascicle (noun): A more general term for a small bundle or cluster, often used interchangeably with "fasciculus" in anatomy and botany (e.g., a fascicle of leaves or nerve fibers).
• Fasciculation (noun): An involuntary twitching or contraction of muscle fasciculi, often visible under the skin.
• Fascicular (adjective): Pertaining to or arranged in a fasciculus or fascicles (e.g., fascicular cambium in plants).

Synonyms

• Bundle: A collection of things, such as fibers, bound together.
• Tract: A major pathway or bundle of nerve fibers in the central nervous system (a specific type of fasciculus).
• Band: A strip or bundle of tissue.

Notes on Meaning

• The term is highly specialized and primarily used in scientific contexts, particularly neuroanatomy, muscle anatomy, and histology. It is not used in everyday conversation.
• While "fasciculus" and "fascicle" are often synonymous in anatomy, "fascicle" has broader applications, including in botany and publishing (a section or installment of a book).

Noun

1. a bundle of fibers (especially nerve fibers)