Jörg Berndt

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In cats anesthetized with chloralose-urethane the blood supply to the right carotid body was performed by an extracorporal circuit containing a supporting pump and a membrane oxygenator. Inlet and outlet of the circuit were connected to the central and the peripheral end, resp., of the dissected right common carotid artery. By exposure of the circuit blood(More)
The medulla oblongata of cats anesthetized with chloralose-urethane was exposed from the ventral side and systematically explored in three coordinates by stimulation (rectangular stimuli 1 msec, 40/sec, 1–4V) with unipolar electrodes. The responses of arterial pressure and of heart rate were determined and mapped similarly to the respiratory responses in(More)
The medulla oblongata of cats anesthetized with Chloralose-Urethane was electrically stimulated with a unipolar electrode (rectangular impulses 40/sec; 1 msec; 1–4 V) from the lower pons to C1–C2. Beginning at the ventral surface all points were stimulated at distances of 0.1–0.2 mm up to a depth of 1 mm, thereafter at millimeter intervals up to a depth of(More)
The region on the ventral surface of the medulla oblongata (see preceding communication) responding maximally to both electrical and chemical stimulation by inducing an increase of ventilation was marked electrolytically and examined histologically. A characteristic group of large multipolar nerve cells was always found at the spot marked by electrolysis.(More)
The medulla oblongata of cats was exposed from the ventral surface and the effects of superficial and intramedullary submaximal stimulation with a unipolar electrode (40/sec, 1 msec, 1–4 V) on respiration were investigated. The response pattern was analysed with respect to reaction types. The observed ventilatory response was then mapped into medullary(More)
AIMS We report an example of malignant myoepithelioma of the vulva, which has not been hitherto described. We discuss the differential diagnosis and briefly review the literature. METHODS AND RESULTS The lesion was found in an 81-year-old woman as an indolent 40 mm tumour. The neoplastic cells showed a myoid, spindled, epithelioid and plasmacytoid(More)
In cats anesthetized with chloralose-urethane, the central respiratory chemoreceptors were exposed to mock CSF of pH 7.02, 7.20, or 7.57. The right carotid body was simultaneously stimulated by intracarotid injections of 40, 80, or 160 μg sodium cyanide in 200 μl Ringer solution. The left carotid nerve and, in some animals, both vagosympathetic truncs were(More)
In 11 adult cats, lightly anesthetized with chloralose-urethane, blood from both common carotid arteries was led into a plastic chamber of 15–20 ml and returned to the carotids at a point 1.5 cm more cranial. By doing so arterial blood was assumed to pool within the chamber and lose itsP CO 2 oscillations which are normally known to exist as a result of the(More)
The ventral medullary surface of cats was perfused with mock CSF of different hydrogen ion concentrations (pH 6.5–7.9).P ACO 2andP CSFCO 2were kept constant at about 35 mm Hg throughout the experiments. The curves relating tidal volume, respiratory frequency, and ventilation to pHCSF were determined in lightly anesthetized (chloralose-urethane) and(More)
In cats lightly anesthetized with chloralose-urethane, the ventral surface of the medulla was perfused with mock CSF of different potassium concentrations, or with solutions containing 2% procaine. In some experiments a wall of gelatin foam glued onto the midline of the medulla allowed a separate perfusion of either half of the medullary surface. To study(More)