Observations on the ultrastructure of nerve cells in the brain of the earthworm, Eisenia foetida, with special reference to neurosecretion

Autor: Takeo Oosaki
Rok vydání: 1966
Předmět:
Zdroj: Zeitschrift f�r Zellforschung und Mikroskopische Anatomie. 72:534-542
ISSN: 1432-0878
0302-766X
DOI: 10.1007/bf00319258
Popis: The submicroscopic structure of nerve cells in the brain of the earthworm Eisenia was studied. Six types of neurons containing morphologically different inclusions are identified. Types 1, 2 and 3 contain vesicles filled with homogeneous materials of high electron density. These are essentially similar to “elementary granules” in neurosecretory systems of vertebrates and invertebrates. Type 4 shows dense-cored vesicles which resemble in size catechol-containing granules as described, for example, in chromaffin cells of the adrenal gland. Type 5 has clear vesicles with a mean diameter of 400 A. Some of these vesicles have a dense osmium deposit. Type 6 contains electron lucent vesicles with diameters of 500–800 A. Occasionally these have osmiophilic cores. Clear vesicles of types 5 and 6 are similar to classical synaptic vesicles, while “granulated vesicles” resemble in size and appearance those described in adrenergic nerve endings. All six vesicle types have the same mode of origin from Golgi membranes. All of these vesicles are considered to be discharged from the perikarya into the axons entering the neuropil.
Databáze: OpenAIRE
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