BRAINCAKEPeripheral Nervous System
The nervous system has two main parts. The central nervous system (CNS) is the brain and spinal cord. The peripheral nervous system (PNS) is all the neurones outside the CNS: the cranial nerves from the brain, the spinal nerves from the spinal cord, and the sense receptors. It connects the CNS to every part of the body.
The PNS contains two kinds of neurone, depending on the direction the impulses travel:
• sensory (afferent) neurones carry impulses from receptors to the CNS
• motor (efferent) neurones carry impulses from the CNS to effectors (muscles and glands)
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All 38 lessons in Mammalian Nervous System · All Edexcel A-level Biology topics