a region where nerve impulses are transmitted and received, encompassing the axon terminal of a neuron that releases neurotransmitters in response to an impulse, an extremely small gap across which the neurotransmitters travel, and the adjacent membrane of an axon, dendrite, or muscle or gland cell with the appropriate receptor molecules for picking up the neurotransmitters.
verb (used without object), synapsed, synapsing.
Cell Biology, Physiology. to form a synapse or a synapsis.
the point at which a nerve impulse is relayed from the terminal portion of an axon to the dendrites of an adjacent neuron
synapse syn·apse (sĭn’āps’, sĭ-nāps’)
The junction across which a nerve impulse passes from an axon terminal to a neuron, a muscle cell, or a gland cell.
The small junction across which a nerve impulse passes from one nerve cell to another nerve cell, a muscle cell, or a gland cell. The synapse consists of the synaptic terminal, or presynaptic ending, of a sending neuron, a postsynaptic ending of the receiving cell that contains receptor sites, and the space between them (the synaptic cleft). The synaptic terminal contains neurotransmitters and cell organelles including mitochondria. An electrical impulse in the sending neuron triggers the migration of vesicles containing neurotransmitters toward the membrane of the synaptic terminal. The vesicle membrane fuses with the presynaptic membrane, and the neurotransmitters are released into the synaptic cleft and bind to receptors of the connecting cell where they excite or inhibit electrical impulses. See also neurotransmitter.
synapse [(sin-aps, si-naps)]
A gap between two nerve cells. Nerve signals are sent across the gap by neurotransmitters.
synapsid (sĭ-nāp’sĭd) A reptile with one temporal opening on each side of the skull. Synapsids evolved in the late Permian Period and were characterized by carrying their limbs under their body and developing front teeth that were different from their back teeth. One group of synapsids, the therapsids, gave rise to the mammals. Compare anapsid, […]
noun, plural synapses [si-nap-seez] /sɪˈnæp siz/ (Show IPA) 1. Also called syndesis. Cell Biology. the pairing of homologous chromosomes, one from each parent, during early meiosis. 2. Physiology. synapse. noun (pl) -ses (-siːz) 1. (cytology) the association in pairs of homologous chromosomes at the start of meiosis 2. another word for synapse synapsis syn·ap·sis (sĭ-nāp’sĭs) […]
noun, Eastern Church. 1. a litany.
noun, plural synapses [si-nap-seez] /sɪˈnæp siz/ (Show IPA) 1. Also called syndesis. Cell Biology. the pairing of homologous chromosomes, one from each parent, during early meiosis. 2. Physiology. synapse. adjective 1. of or relating to a synapse noun (pl) -ses (-siːz) 1. (cytology) the association in pairs of homologous chromosomes at the start of meiosis […]