Showing papers in "Brain Research in 1969"

TL;DR: The rat's MD-projection cortex differs from that in the monkey in that it lacks a granular layer and appears to have no prominent direct associations with temporal and juxtahippocampal areas, suggesting that the striatum or thalamus receives a proportionally larger share of the MD projection in this animal than it does in themonkey.

TL;DR: In this article, the authors applied the method of orthograde fibre degeneration to the adult rat and found that fimbrial fibres terminate on dendrites only, whereas the hypothalamic fibres terminated on cell somata as well as dendritic profiles.

TL;DR: The rapid re-occupation of sites by local heterotypic terminals may remove an important stimulus for the re-growth of the original cut axons and may be a factor in the apparent failure of effective anatomical regeneration in the central nervous system.

TL;DR: The many disagreements over the anatomy, extent and functions of the prestriate cortex in the monkey have been reviewed at length and it is sufficient to point out that the disagreements have not only been interdisciplinary but also intradisciplinary.

TL;DR: These experiments show that when a rat encounters objects which deflect its mobile or stationary vibrissae, a relatively large population of first-order somatic sensory neurons is capable of coding the following aspects of mechanical stimuli: peripheral location, deflection direction, onset, termination, amplituded, velocity, duration, repetition rate, and temporal pattern.

TL;DR: The cingulate cortex appears as a vast and differential neural mechanism receiving major impulse afflux from the limbic system by way of the anterior and laterodorsal thalamic nuclei, and exerting its influence primarily upon brain structures not directly involved in any of the currently recognized limbic circuits.

TL;DR: It is suggested that the structural features of the MFB furnish the anatomical substrate necessary for the shifting patterns of autonomic activity accompanying the different behavioral states of the animal.

TL;DR: The above findings were interpreted as illustrating the importance of dopamine for the mediation of certain types of postural and locomotor activity in nialamide-pretreated rats.

TL;DR: The relevance of hormone retention to the function of the hippocampus and septum in behavior and control of ACTH release is discussed and the possible cellular sites of action of corticosterone are considered.

TL;DR: There appears to be a correlation between the field of origin in the auditory cortex and the site of termination of corticothalamic fibers in the medial geniculate body and in the posterior group respectively, and certain principles of the columnar organization in subcortical sensory relay nuclei are suggested.

TL;DR: The intra- and interhemispheric neocortical connections of various parts of the superior temporal gyrus and the supratemporal plane have been studied with Nauta silver impregnation technique in the rhesus monkey and the significance of ‘midline’ in auditory system is discussed.

TL;DR: The prevalence in the hypothalamus of neurons with long dendrite suggests that the stria terminalis may have synaptic contracts not only with perikarya and dendrites of neurons lying within its synaptic fields, but also with dendreys of neurons whose cell bodies lie well outside these fields.

TL;DR: The ventrobasal complex of the cat thalamus has been studied by light and electron microscopy and it is likely that the various synaptic types represent differences in the sites of origin of the parent axons giving rise to these synapses.

TL;DR: The interhemispheric connections of various parts of the parietal lobe have been studied with silver impregnation technique in the rhesus monkey and the caudal part of the inferior parietal lobule projected to entirely different non-homotopical areas besides projecting to the homotopicals region.

TL;DR: Profound arterial hypotension was induced in 15 rhesus monkeys under pentobarbital anaesthesia, by a ganglion-blocking agent, head-up tilt and arterial bleeding, and lesions in the cerebral arterial boundary zones appear to result from a profound local reduction in cerebral blood flow which leads to a correspondingly localized metabolic disturbance, later recognisable as ‘ischaemic cell change’.

TL;DR: Replacement therapy instituted from the time of thyroidectomy reversed completely the reduction in myelin deposition as assessed by the amount of cerebrosides per unit weight of cerebrum.

TL;DR: The fine structural features of Wallerian degeneration have been examined by electron microscopy of the cat central nervous system from 1 to 104 days following lesions and neither astroglial nor oligodendroglian cells appear to participate in the phagocytosis of degenerating myelin.

TL;DR: The granule-containing cells of the rat superior cervical sympathetic ganglion can be classified as interneurons which receive impulses from pre-ganglionic sympathetic fibers and transmit to small nerve processes within theganglion.

TL;DR: Single units in the medial forebrain bundle and elsewhere in the preoptic area of anesthetized male rats responded to electrical shocks of the olfactory bulb and to odors and changes in firing rates in the mesencephalic reticular formation were closely associated with changes in the EEG.

TL;DR: It was found that the brain cytosol contained 12% or less of the galactosidase activiti, the value increasing somewhat in older rats, suggesting that most of the hydrolysis of theGalactosylphenol is carried out by the lactosylceramide hydrolase.