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1. Long-term electrical stimulation was given during 4 or 8 wk to the peroneal nerve of deafferented hindlimbs in hemispinalized adult cats. Four different stimulation patterns were compared: 100-Hz bursts covering 5% of daily time (F1), 10-Hz bursts covering 5% of daily time (S1), pattern S1 plus added 100-Hz bursts during 0.5% of daily time (S1F2), and,(More)
1. Long-term electrical stimulation was given to the peroneal nerve of deafferented hindlimbs in hemispinalized adult cats. The amount of stimulation covered 0.5-5.5% of total time per day, different in different animals. For some aspects of the present study, use was also made of cats subjected to "tonic" patterns of chronic stimulation (typically covering(More)
Intrafusal muscle fibres in adult muscle spindles differ in their myosin composition. After selective motor denervation intrafusal muscle fibres develop mature ultrastructural characteristics. In order to evaluate the role of fusimotor innervation on the maturation of the myosin composition of intrafusal muscle fibres we have examined with(More)
Mammalian intrafusal fibre types (nuclear chain, nuclear bag1 and nuclear bag2 fibres) are known to differ in their ultrastructure, intensity of the myofibrillar histochemical ATP-ase reaction, type of innervation and time course of contraction. The present study concerns the myosin composition of these intrafusal fibre types in the soleus muscle (mouse)(More)
1. Normal and chronically stimulated peroneus longus muscles of the cat's hind limb were studied with respect to fibre size and staining properties for myofibrillar (myosin) adenosine triphosphatase (ATPase) and succinate dehydrogenase (SDH) activity. The intensity of staining for SDH activity was measured by microphotometry from the central portions of the(More)
In normal adult cats we measured the density of staining for the activity of succinate dehydrogenase (SDH staining) in ventral horn cells of different sizes. The measurements were restricted to that part of the lumbar ventral horn (L6-L7) which is known to contain motoneurones of the peroneal nerve. A statistically significant tendency was found for the SDH(More)
This paper decribes the use of the alpha-glucan uridine di-phosphate glucosyl transferase reaction for enhancing the contrast between glycogen depleted and non-depleted muscle fibers in the periodic acid schiff (PAS) reaction. Muscle fiber glycogen was depleted by prolonged repetitive stimulation of single motor units of the extensor digitorum longus muscle(More)
This paper describes cytophotometric determinations of cytochrome oxidase (COX) and succinate dehydrogenase (SDH) activities in neurons in 3 areas of the spinal motor column of the teleost fish Brachydanio rerio (the Zebrafish). Purpose of this investigation was to analyse the correlation between the oxidative metabolic capacity of motoneurons with their(More)
The cat's m.peroneus longus was analyzed with respect to the somatotopic relation between the rostro-caudal site of emergence of ventral root filaments (i.e. rostro-caudal site of motoneurones) and the intramuscular distribution of innervation. Rostro-caudally distinct fractions of ventral roots were stimulated repetitively in order to deplete their(More)
De term syncope (afgeleid van het Griekse woord synkoptein dat neerslaan betekent) wordt in medische kringen gebruikt voor een plotseling en voorbijgaand verlies van bewustzijn, veroorzaakt door een afname van de bloedstroom naar de hersenen. Staat de persoon die dit overkomt rechtop, dan zal dit gepaard gaan met omvallen: de persoon valt flauw. In sommige(More)