PHGY 350 Chapter Notes - Chapter 14.1: Anterior Communicating Artery, Posterior Communicating Artery, Anterior Cerebral Artery
22 Feb 2020
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Reticular formation: network of nuclei & neurons that are scattered t/o brainstem. Reticular activating system (ras): part of the reticular formation; determine the degree of cerebral cortex awareness. Chemoreceptors: monitor variations in blood ph and oxygen levels. Dermatome: the area of sensory innervation of the skin by a specific spinal nerve. If cell body viable, axons may be able to regenerate. Acetylcholine: present at the neuromuscular junction of the ans, pns, and less commonly the cns. Catecholamines (ex: norepinephrine, epinephrine, dopamine): present in brain. When both norepinephrine and epinephrine are released from the adrenal medulla due to sns stimulation - these neurotransmitters circulate in blood and interstitial fluid These diffuse into synaptic cleft and stimulate the appropriate receptors in the sns. Histamine: emotions, body temp reg, water balance. Enkephalins and beta-endorphins : can block the conduction of pain impulses in the spinal cord and brain. Incorporates both the sympathetic and parasympathetic nervous system.
