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Nerves and Neurons - spinal cord Cranial Nerves 12 pairs...

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Nerves and Neurons Neurilemma: Thin layer of cells wrapped around axons outside brain and spinal cord; forms a tunnel that damaged fibers follow as they repair themselves Two Divisions of the Peripheral Nervous System Somatic System: Carries messages to and from skeletal muscles and sense organs; controls voluntary behavior Autonomic System: Serves internal organs and glands; controls automatic functions such as heart rate and digestion pressure Two Divisions of the Autonomic Nervous System Sympathetic: Arouses body; emergency system Parasympathetic: Quiets body; most active after an emotional event The Spinal Cord Spinal Nerves: 31 of them; carry sensory and motor messages to and from the
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Unformatted text preview: spinal cord Cranial Nerves: 12 pairs that leave the brain directly; also work to communicate messages The Spinal Cord and Behavior Reflex Arc: Simplest behavior; occurs when a stimulus provokes an automatic response Sensory Neuron: Nerve cell that carries messages from the senses toward the CNS Connector Neuron: Nerve cell that links two others Motor Neuron: Cell that carries commands from the CNS to muscles and glands Effector Cells Cells capable of producing a response - out of the brain Affector Cells Cells capable of bringing information into the brain...
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