The neuronal structure of the mamillary nuclei in guinea pig: Nissl, Klüver-Barrera and Golgi studies.
The neurons of the mamillary body of adult guinea pigs were classified into four types: Type 1--unidendritic cells with rounded perikarya (7-16 microns) and one thick primary dendrite, mostly dividing into tortuous secondary branches; Type 2--bipolar cells: curly or simple ones with fusiform perikarya (13-22 microns); the curly-bipolar neurons possess 2 primary dendrites which may divide, even into tertiary dendrites, but each of them runs in screw-like or bending patterns; the simple-bipolar neurons have slender dendrites following a more straight route; Type 3--multipolar cells with cap-like perikarya (10-20 microns) and 2-3 dendritic trunks originating from the base of the perikaryon and running in a wavy pattern; sometimes their dendrites possess spiny-like protrusions; Type 4--multipolar cells with triangular or quadrangular perikarya (13-28 microns) and 3-4 dendritic trunks, poorly ramified, having a rather rectilinear course. In all types of neurons, dendritic spines are absent or rare. The majority of these neurons have a short impregnated axon originating from the perikaryon or primary dendrite.
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Department of Comparative Anatomy, Warmia and Masuria University, Olsztyn, Poland. maciek@matman.uwm.edu.pl
D000818:Animals; D048429:Cell Size; D005260:Female; D006168:Guinea Pigs; D008326:Mammillary Bodies / Q000166:cytology*; D009474:Neurons / Q000145:classification* / Q000648:ultrastructure*; D009562:Nissl Bodies; D016622:Silver Staining