Synaptic junction see synapse

synaptic knobs Swellings on the axon ends where contact is made with dendrites of another nerve cell.

synapticulum n.; pl. -la [Gr. synapsis, union] (CNID) One of numerous conical or cylindrical calcareous processes connecting the septa. synapticular a.

synaptinemal complex Organelle present during pachytene stage of eukaryote meiosis visable in electron micrographs.

synaptorhabdic a. [Gr. synapsis, union; rhabdos, rod] (MOLL: Bivalvia) Pertaining to ctenidia where filaments are connected at their interlamellar edges by strands of cellular tissue; organic interfilamentary junctions. see eleutheror-habdic.

synaptychus n. [Gr. syn, together; apo-, away from; ptychos, fold] (MOLL: Cephalopoda) Double calcareous plates fused with other paired plates. see anaptychus.

syncerebrum n. [Gr. syn, together; L. cerebrum, brain] The supraesophageal glanglia or brain of many invertebrates.

synchronic speciation Speciation that occurs at the same time level. see allochronic speciation.

synchronizer n. [Gr. syn, together; chronos, time] An environmental factor that influences the phenomena of cir-cadian rhythm to conform to a daily cycle instead of wandering.

synclerobiosis n. [Gr. syn, together; keros, chance; bios, life] (ARTHRO: Insecta) In Hymenoptera, a temporary association of two species of ants of independent colonies.

synconoid grade (PORIF) A grade of construction intermediate between the asconoid and the leuconoid, in which each radial canal is subdivided into elongate-flagellate chambers grouped around a common excurrent channel. see leucon-oid grade, asconoid grade.

syncyte n. [Gr. syn, together; kytos, container] A polyploid or multinucleate cell.

syncytium n.; pl. syncytia [Gr. syn, together; kytos, container] A continuous mass of protoplasm with several or many nuclei; a multinucleate cell. syncytial a.

syndesis n. [L. syndesis, a binding together] 1. Binding to gether. 2. Synapsis. 3. A membrane connecting two separate parts permitting movement between them.

syndiacony n. [Gr. syn, together; diakonos, servant] (ARTHRO: Insecta) A form of commensalism between ants and plants with both obtaining benefit.

syndrome n. [Gr. syn, together; dramein, to run] Signs and symptoms characteristic of a particular disease.

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