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Nervous system: overview

Nervous systems can be broken down into three components, some of which can overlap locally: a sensory input, an instance for processing the information (integration) and a motor output. The central nervous system (CNS), in which integration generally takes place, consists of the brain and spinal cord. The sensory part of the PNS transmits the sensory information via so-called afferent neurons from the sensory cells to the CNS. The motor part sends signals from the CNS to the executing cells, the effectors, via efferent neurons. The afferent neurons can be further divided into somatic and visceral sensory neurons (from the cervical, thoracic and abdominal viscera). In the case of motor neurons, a distinction is made between somatic and autonomous neurons. are controlled, the signals of the visceral and autonomic neurons are often transmitted without conscious perception or control and are mainly used for control and regulation processes.

Video: 2-Minute Neuroscience: Synaptic Transmission (August 2022).