end bulb

American  

noun

Anatomy.

1. any of various types of oval or rounded structures occurring at the ends of nerve fibers, ranging from slight enlargements to complex corpuscles that act as sensory receptors for pain, touch, cold, etc.

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Example Sentences

At the end of the axon is the axon terminal, where there are usually several branches extending toward the target cell, each of which ends in an enlargement called a synaptic end bulb.

From Textbooks • Jun. 19, 2013

The concentration of Ca2+ increases inside the end bulb, and the Ca2+ ion associates with proteins in the outer surface of neurotransmitter vesicles.

From Textbooks • Jun. 19, 2013

Instead of a synaptic end bulb, a neurotransmitter is released from swellings along the length of a fiber that makes an extended network of connections in the target effector.

From Textbooks • Jun. 19, 2013

The presynaptic element is the synaptic end bulb of the axon where Ca2+ enters the bulb to cause vesicle fusion and neurotransmitter release.

From Textbooks • Jun. 19, 2013