| synaptic terminals | The somewhat enlarged, often club-shaped endings by which axons make synaptic contacts with other nerve cells or with effector cells (muscle or gland cells). As isolated, by homogenizing brain or spinal cord, they contain acetylcholine and the related enzymes. Terminals contain neurotransmitters of various kinds, sometimes more than one. These can be demonstrated by chemical analysis and immunocytochemical methods. See: synapse. Synonym: axonal terminal boutons, end-feet, neuropodia, pieds terminaux, synaptic boutons, synaptic endings, synaptic terminals, terminal boutons, bouton terminaux. (05 Mar 2000) |
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| synaptic transmission | <physiology> The process of propagating a signal from one cell to another via a synapse. (10 Jan 1998) |
| synaptic vesicle | <cell biology> Intracellular vesicles found in the presynaptic terminals of chemical synapses, which contain neurotransmitter. During activity the vescles release their contents at the synapse and the neurotransmitter stimulate receptors on other cells. (10 Jan 1998) |
| synaptic vesicles | Membrane-bound compartments which contain transmitter molecules. Synaptic vesicles are concentrated at presynaptic terminals. They actively sequester transmitter molecules from the cytoplasm. In at least some synapses, transmitter release occurs by fusion of these vesicles with the presynaptic membrane, followed by exocytosis of their contents. (12 Dec 1998) |
| synapticula | Origin: NL, dim. From Gr. Fastened together. <zoology> One of numerous calcareous processes which extend between, and unite, the adjacent septa of certain corals, especially of the fungian corals. Source: Websters Dictionary (01 Mar 1998) |
| synaptinemal complex | A submicroscopic structure interposed between the homologous chromosome pairs during synapsis. Synonym: synaptonemal complex. (05 Mar 2000) |
| synaptobrevin | <protein> Small integral membrane protein of synaptic vesicles. Binds SNAPs and also interacts with target SNARE (syntaxin). Cleaved by clostridial toxins encoding zinc endopeptidases, such as tetanus toxin and botulinum toxin, blocking synaptic release. (18 Nov 1997) |
| synaptogenesis | <cell biology> Formation of a synapse. (18 Nov 1997) |
| synaptology | Study of the synapse. (05 Mar 2000) |
| synaptonemal complex | <cell biology> Structure, identified by electron microscopy, lying between chromosomes during synapsis, consists of two lateral plates closely apposed to the chromosomes and connected to a central plate by filaments. It appears to act as a scaffold and is essential for crossing over. (18 Nov 1997) |
| synaptophysin | <protein> Abundant synaptic vesicle membrane component glycoprotein composed of a 38 kD subunit that spans the membrane 4 times and has both its N and C termini located cytoplasmically. Its transmembrane organisation and putative quaternary structure ressembles the molecular topology of gap junction proteins or connexins. (10 Jan 1998) |
| synaptoporin | <protein> Putative channel protein of synaptic vesicles and a member of the synaptophysin or connexin superfamily. It has 58% amino acid identity to synaptophysin with highly conserved transmembrane segments but a divergent cytoplasmic tail. (18 Nov 1997) |
| synaptosome | <cell biology> A subcellular fraction prepared from tissues rich in chemical synapses, used in biochemical studies. Consists mainly of vesicles from presynaptic terminals. Origin: Gr. Soma = body (18 Nov 1997) |
| synaptosomes | Pinched-off nerve endings and their contents of vesicles and cytoplasm together with the attached subsynaptic area of the membrane of the post-synaptic cell. They are largely artificial structures produced by fractionation after selective centrifugation of nervous tissue homogenates. (12 Dec 1998) |
| synaptotagmin | <protein> Calcium binding synaptic vesicle protein that binds acidic phospholipids and recognises the cytoplasmic domain of the neurexins. May be involved in vesicle docking. (18 Nov 1997) |
| synchronous pacing |
cardiac pacing in which information about sensed activity in one or more cardiac chambers is used to determine the timing of impulse generation by the pacemaker.
출처: www.mercksource.com/pp/us/cns/cns_hl_dorlands.jspz...
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| symmetrical sensory polyneuropathy |
sensory neuropathy in the limbs, especially their distal parts, seen in diabetes mellitus; it usually develops slowly but occasionally has an acute onset.
출처: www.mercksource.com/pp/us/cns/cns_hl_dorlands.jspz...
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| sympathetic block |
blocking of the sympathetic trunk by paravertebral infiltration with an anesthetic agent.
출처: www.mercksource.com/pp/us/cns/cns_hl_dorlands.jspz...
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| synchronous pacemaker |
an implanted cardiac pacemaker that synchronizes the electromechanical events in the atrium with those of the ventricle by delivering stimuli in response to sensed activity in the atrium, ventricle, or both.
출처: www.mercksource.com/pp/us/cns/cns_hl_dorlands.jspz...
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| syncytial endometritis |
a post-pregnancy condition consisting of a benign tumor-like lesion with infiltration of the uterine wall by large syncytial trophoblastic cells; called also syncytioma.
출처: www.mercksource.com/pp/us/cns/cns_hl_dorlands.jspz...
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| SY | (of ovaries of flowering plants) consisting of united carpels |
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| SY | (logic) a term that cannot be used meaningfully in isolation |
| SY | (logic) of a term that cannot stand as the subject or (especially) the predicate of a proposition but must be used in conjunction with other terms |
| SY | cyclotron that achieves relativistic velocities by modulating the frequency of the accelerating electric field |
| SY | a device used in photography to synchronize the peak of a flash with the opening of the camera shutter |
| SY | an automotive system for shifting gears in which the gears revolve at the same speed and so shift smoothly |
| SY | occurring or existing at the same time or having the same period or phase |
| SY | the relation that exists when things occur at the same time |
| SY | concerned with phenomena (especially language) at a particular period without considering historical antecedents |
| SY | occurring or existing at the same time or having the same period or phase |
| SY | (of taxa) occurring in the same period of geological time |
| SY | an explanation of a person's mastery of their native language |