[A comparative analysis of the descending projections of areas 5 and 7 of the parietal cortex to the cat brain stem].
Relative quantity of descending fibres of parietal fields 5 and 7 of cat brain stem was studied. Maximal projections of these field were determined, maximal projections of fields 5 and 7 to red nucleus reticular nucleus of midbrain and nucleus proprius of pons were shown. Topographic and quantitative overlapping of projections of fields 5 and 7 in red nucleus and reticular nucleus of midbrain was noted. Field 5 is maximally presented in ventral nucleus while field 7 has maximal number of projections in lateral nucleus. Projection of fields 5 an 7 to superior colliculus of tectum of the midbrain was determined that was significant although less pronounced than in the above mentioned nuclei. The number of fibres projecting onto the superior colliculus of tectum of the midbrain (its caudal part) from field 7 exceeds that from field 5. There are less fibres in inferior colliculus of tectum of the midbrain than in superior colliculus. The number of fibres projecting from field 5 is greater than those from field 7 in inferior colliculus. In caudal reticular nucleus of pons the presence of fields 5 and 7 was not significant. Comparison of the authors' data with that available in literature allows to suggest the possible inhibitory, i.e. modulating influence of parietal cortex on nuclei of the pons.
Ipekchian
N M
NM
Laboratory of Vegetative Nervous System Physiology, L. A. Orbeli Institute of Physiology, Academy of Sciences of Armenia, Yerevan.
Baklavadzhian
O G
OG
D000818:Animals; D001933:Brain Stem / Q000033:anatomy & histology*; D002415:Cats; D004525:Efferent Pathways / Q000033:anatomy & histology; D009410:Nerve Degeneration; D009412:Nerve Fibers / Q000648:ultrastructure; D010296:Parietal Lobe / Q000033:anatomy & histology*; D017729:Presynaptic Terminals / Q000648:ultrastructure
Sravnitel'nyĭ analiz niskhodiashchikh proektsiĭ poleĭ 5 i 7 temennoĭ kory na stvol mozga koshki.