CSB346H1 Lecture Notes - Lecture 3: Mechanoreceptor, Central Chemoreceptors, Vagus Nerve

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Galen injured below neck continued to breathe, but injured in neck stopped breathing brain is involved in breathing. Lorry cerebellectomized rabbits continued to breathe circuits breathing lay in brainstem or upper spinal cord. Legallois extracted tissue from brainstem; removing area close to vagus nerve stopped breathing prebotc (where vagus nerve exits brainstem) electrical and chemical lesions in brainstem showed that damage to either areas stopped/disrupted breathing. Respiratory neurons in the nts process signals from lung afferents and respond to some blood factor. Respiratory signals go from respiratory neurons to motor neurons that innervate either the diaphragm or intercostal muscle. Recorded slow rhythmic oscillations in isolated goldfish brainstem. Rhythmic changes in electrical potential coincided with respiratory movements in gills of intact goldfish brainstem generated signal to breathe. Recorded the ec action potentials of individual neurons in the brainstem breathing is generated by neuron-neuron communication in the medulla. Respiratory rhythm generator (brainstem) respiratory motorneurons & respiratory muscles muscle contraction thoracic expansion.

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