VESICLE By N., Pam M.S. - April 29, 2013 noun. a fluid-filled sac-like structure, like any of the synaptic vesicles inside axon terminals which consist of neurotransmitter molecules. VESICLE: "The vesicle is easier to understand in the spliced view." Related Psychology Terms AXOPLASMIC TRANSPORT, AXONAL VARICOSITIES RELEASE ZONE SYNAPTIC VESICLE AXONAL TRANSPORT SEMINAL VESICLE DENDRITIC SPINE ACETYLCHOLINESTERASE (ACHE) TYPE III CELL NEUROTRANSMISSION BLOOD-BRAIN BARRIER Cite this page: N., Pam M.S., "VESICLE," in PsychologyDictionary.org, April 29, 2013, https://psychologydictionary.org/vesicle/ (accessed April 18, 2021).