Definition

Noun: * The flattened end of a motor neuron that transmits neural impulses to a muscle: A specialized terminal structure of a motor nerve fiber that forms a synapse with a muscle fiber, releasing neurotransmitters to trigger muscle contraction. It is also commonly called a motor end plate.

Usage

The term "endplate" is a technical, anatomical term used primarily in neuroscience, physiology, and medicine. It refers specifically to the neural component of the neuromuscular junction.

Examples

• The neurotransmitter acetylcholine is released from the endplate to stimulate the muscle.
• Damage to the motor neuron can affect the function of the endplate.
• In myasthenia gravis, antibodies attack the receptors on the muscle membrane at the endplate.

Advanced Usage

• "Endplate potential": The local depolarization of the muscle fiber membrane caused by the neurotransmitter released from the endplate. It may or may not lead to a full muscle action potential.
  • A sufficient endplate potential is required to trigger muscle contraction.

Variants and Related Words

• Motor end plate: The full and more precise term for "endplate."
• Neuromuscular junction: The entire synaptic connection between the motor neuron and the muscle fiber, which includes the endplate (neural component) and the post-synaptic muscle membrane.
• Synaptic terminal / Nerve terminal: More general terms for the end of a neuron that releases neurotransmitters; an endplate is a specific type of synaptic terminal.

Synonyms

• Motor end plate
• Nerve ending (in the specific context of motor neurons and muscles)

Notes on Meaning

The word "endplate" is highly specific and has essentially one meaning in standard English usage: the terminal structure of a motor neuron. It is not used in general or figurative contexts.

Noun

1. the flattened end of a motor neuron that transmits neural impulses to a muscle