Glossary Terms
- Desmotubule
- A narrow tubule that passes through a plasmodesma and connects endoplasmic reticulum in adjacent cells.
- Disc
- A flattened, circular spindle pole body (see Plaque).
- Dolipore
- See Septal pore swelling.
- Globular end
- In an interphase-prophase spindle pole body, the two more or less globose or spherical structures connected by the middle piece; each globular end forms a spindle pole body during nuclear division and varies in shape (globose, subglobose or ellipsoid) when observed in sections parallel to the long axis of the spindle.
- Interzone
- A nuclear region lying between the two separating, chromatin containing parts of a dividing nucleus.
- Intranuclear element
- At interphase-prophase a differentiated region of the nucleoplasm underlying the external spindle pole body prior to break down of the adjacent nuclear envelope and spindle initiation.
- Microbody
- In some Basidiomycota, membrane-bound body associated with septa; compare Woronin body.
- Microtubule organizing center (MTOC)
- A general term for microtubule organizing structures; see Spindle pole body.
- Nucleolus, discarded
- During nuclear division the intact nucleolus is discarded into the cytoplasm (I. B. Heath, Int. Review Cytol. 64:1, 1980).
- Nucleolus, dispersed
- During prophase the nucleolus is dispersed and its components are no longer recognizable (I. B. Heath, Int. Review Cytol. 64:1, 1980).
- Nucleus associated organelle (NAO)
- See Spindle pole body.
- Parenthesome
- See Septal pore cap.
- Perinuclear endoplasmic reticulum
- Layers of endoplasmic reticulum that enclose the nucleus.
- Plasmodesmata
- Narrow pores that traverse a septum.
- Plaque
- A flattened spindle pole body (see Disc).
- Polar fenestra
- An opening in the nuclear envelope surrounding the spindle pole body.
- Septal pore cap
- a differentiated part of the endoplasmic reticulum that surrounds the septal pore swelling; parenthesome.
- Septal pore swelling
- An enlargement of the septal wall surrounding the septal pore; dolipore.
- Septum
- A cross wall in a hypha.
- Spindle pole body (SPB)
- A structure that forms spindle and astral microtubules in Fungi that lack flagella; a type of microtubule organizing center; nucleus associated organelle. See Disc, Plaque, and Globular end.
- Spindle pole body cap
- At metaphase-anaphase a part of the endomembrane system that surrounds the spindle pole body on its cytoplasmic side.
- Spindle vesicles
- Small vesicles scattered among the spindle microtubules and chromatin of a dividing nucleus.
- Woronin body
- Membrane-bound body with electron-dense contents or crystals, usually associated with mycelial septa in Ascomycota; a specialized type of microbody; see Microbody.
- Zone of exclusion
- In septa of Basidiomycota, a region of the cytoplasm surrounding the abseptal surface of the septal pore cap that is free of most cell organelles.
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