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autonomic nervous system (visceral)
regulates internal organs
2 branches: sympathetic and parasympathetic
somatic nervous system
involved in interactions with the external world
controls voluntary movement
sympathetic control pathway
signal leaves lateral horn of spinal cord
reaches sympathetic ganglion (releases acetylcholine & activates next neuron)
next neuron travels to target organ (releases norepinephrine)
parasympathetic control pathway
signal leaves brainstem via cranial nerve (vagus)
travels almost all the way to organ
synapses to parasympathetic ganglion next to organ
releases acetylcholine
amygdala
needed for fear, alertness, and defensive movements
insular cortex
emotional awareness and associations
ventral medial prefrontal cortex
regulates emotions according to context/expectations