MICRO 20 Lecture 7: The Motor Branches
Document Summary
Motor branch controlling internal organs by controlling cardiac muscle, smooth muscle and glands. You cannot decide on the increase or decrease in activity to an internal organ. Three neuron chain from nucleus in brain that initiates the that initiates the response to the target organ. Organs receive input from sympathetic and parasympathetic divisions. Carries info from autonomic nucleus to pre-ganglionic neuron in the brain stem or in spinal cord (lateral horn) Neuron that carries info from cns through cranial or spinal nerves to post-ganglionic neurons in an autonomic ganglion. Neuron that carries info from autonomic ganglion to target organ and releases a neurotransmitter onto cells in target organ which produces a response. 1 type of sympathetic pre-ganglion neurons carries info to adrenal medulla (inner layer of adrenaline glands) where it stimulates neuroendocrine cells to secrete the hormones epinephrine (adrenaline) and norepinephrine into blood. The pre-ganglionic neuron releases the neurotransmitter acetyl choline (ach) onto the.
