Vertebrates have a spinal column or backbone. Vertebrates have neurons that are outside that spinal column called Peripheral Neurons and neurons inside the spinal column and head called Central Neurons.
i) Peripheral Neurons c a) Efferent Nerves (motor nerves) send signals from central nerves to effector organs; b) Afferent Nerves (sensory nerves) send signals from sensory receptor to the central nervous system.
ii) Central Nervous System (CNS) is made up of your brain and spinal cord; both are made up of cells called neurons; most neurons are Interneurons, which connect all neurons
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