The peripheral reactivity of cortical area 6 () of the Cat has been examined, in order to compare its features with those of the peripheral reactivity of area 4 (). Peripheral stimulation was actuated by single shocks to the skin applied in sequence by means of several needle-electrodes thrust into standard locations of limbs, trunk, neck and of the whisker region. With conventional electrophysiological techniques, in 19 animals extracellular records from 323 cortical neurones were obtained, 258...
Microelectrode recordings (glass micropipettes filled with 2.5 M KCl) from the two subdivisions of the motor cortex (area and , [5]) of chloralose-anaesthetized, curarized cats have been performed in order to characterize the response properties of the neurones receiving projections from the n. ventralis lateralis (VL). Extracellular unitary activity was obtained from 345 cells (226 from area 6 and 119 from area 4). Each one was tested for the effects of the electrical stimulation of the dorsal...
The culture medium of Wolff and Haffen with normal serum is unable to maintain erythropoiesis in organotypic cultures of Guinea Pig bone marrow. On the contrary the serum of anemic Guinea Pig is capable of stimulating erythropoiesis in vitro. Fragments of Guinea Pig kidney and of foetal Chick liver also maintains in vitro erythropoiesis when associated with myeloid tissue. This seems to demonstrate that the production of erythropoietic factors by mammal kidney and avian embryonic liver also occurs...
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