BIOL 252 1st Edition Lecture 5 Outline of Last Lecture I Cessation of the Signal II Postsynaptic Potentials III Neuronal Circuits IV Autonomic Nervous System Visceral Motor Division Outline of Current Lecture I Enteric Nervous System II Poll Everywhere III Single Innervation IV Control of Autonomic Function V Sensory Systems Current Lecture I Enteric Nervous System a The nervous system of the digestive tract b Intrinsic wiring c How can the parasympathetic and sympathetic divisions give different instructions to their target organs i It depends on which neurotransmitters are present 1 Neurons innervating the same structure release different neurotransmitters ii Dual innervation the heart 1 Sinus rhythm a NE from sympathetic NS i b ACh from parasympathetic NS II i Poll Everywhere a A man has a cervical spinal cord lesion NE would cause his pupils to dilate These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute III IV V b Eye dilation sympathetic i Thoracic lumbar region ii Long postsynaptic and short presynaptic iii Cervical lesion dimmer lights are not sufficient need NE Single Innervation a Blood vessels b Sufficient to control vasoconstriction AND vasodilation c Vasoconstriction blood pressure pushing out i Strong sympathetic stimulation smooth muscle contraction opposes blood pressure ii However if stimulus is weak blood pressure wins smooth muscle relaxation vasodilation d Tone slight state of contraction vasomotor tone Control of Autonomic Function a Cerebral cortex not control but influence emotions b Hypothalamus control center of visceral motor initiates c Midbrain pons medulla brainstem nuclei for cardiac vasomotor control salvation swallowing sweating pupillary changes d Spinal cord defecation and micturition urination reflexes e ANS regulated by several levels of CNS Sensory Systems a Sensory info transmitted to CNS i Intensity strength of stimulus transmitted by frequency of neurons going to CNS low intensity slow firing rate ii Modality type pain texture temperature different types of energy and environmental stimuli iii Location receptive field iv Duration how long the stimulus lasts b The Chemical Senses i Gustation Sense of Taste 1 Visible bumps papillae not taste buds a b Sense texture 2 Taste buds a Sense chemicals b ii Physiology of Taste 1 Salty produced by metal ions sodium and potassium 2 Sweet associated with carbohydrates 3 Sour acids such as in citrus fruits 4 Bitter associated with alkaloids nicotine caffeine quinine 5 Umami meaty or savory taste of amino acid glutamate
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