12 pairs, How many pairs of cranial nerves originate directly from the brain?, Somatic Nervous System, Which division of the PNS controls voluntary muscle movements?, Autonomic Nervous System, ​Which division of the PNS regulates involuntary functions like heart rate and digestion?, Sympathetic Nervous System, Which branch of the autonomic nervous system triggers the "fight or flight" response during stress?, Afferent (Sensory) Neurons, Which neurons carry sensory signals from the body towards the central nervous system?, Myelin sheath, What protective fatty layer covers many peripheral nerve fibers to speed up signal transmission?, Schwann cells, Which cells produce the myelin sheath in the Peripheral Nervous System

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