axon
Definition
- Noun:
- The long, slender projection of a neuron (nerve cell) that conducts electrical impulses away from the neuron's cell body. An axon is a fundamental part of a nerve cell responsible for transmitting signals to other neurons, muscles, or glands.
Usage
- The term "axon" is used specifically in the fields of biology, neuroscience, and anatomy to describe this essential neural structure.
- It is typically used as a countable noun (e.g., , , ).
Examples
- Noun:
- The axon of a motor neuron can be very long, extending from the spinal cord to a muscle in the foot.
- Electrical signals travel along the axon to the synaptic terminal.
- Damage to the axon can disrupt neural communication.
Advanced Usage
- Axonal transport: Refers to the process of moving materials along the length of an axon.
- Axonal transport is crucial for supplying nutrients to the synaptic terminal.
- Axon hillock: The specialized region of the neuron cell body where the axon originates and where action potentials are often initiated.
- The axon hillock integrates incoming signals before generating an action potential.
Variants and Related Words
- Axonal (adjective): Pertaining to or of the nature of an axon.
- Axonal damage is a feature of some neurodegenerative diseases.
- Axoneme (noun): A different biological term referring to the central strand of a cilium or flagellum. (Note: This is a related but distinct anatomical structure).
Synonyms
- Nerve fiber: A more general term that can include axons along with their myelin sheaths.
- Neurite: A broad term for any projection from a neuron's cell body, which can be an axon or a dendrite.
Related Phrases and Compounds
- Axon terminal: Also called the synaptic terminal; the end of an axon where it forms a junction with another cell and releases neurotransmitters.
- Neurotransmitters are stored in vesicles at the axon terminal.
- Myelinated axon: An axon that is insulated by a myelin sheath, which speeds up signal transmission.
- Myelinated axons appear white, forming the brain's white matter.
Noun
-
long nerve fiber that conducts away from the cell body of the neuron
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