Physiology :
System Nervous :
II.3.2. Thalamus
Consists of neurons that link different parts of the brain together. Known
as the "bedroom", it regulates consciousness, vigilance (in connection with
various senses) and sleep.
II.3.3. Corpus callosum
This is a set of nerve fibers that connect the left and right hemispheres of
the brain.
II.4. The peripheral nervous system (PNS)
The peripheral nervous system is made up of sensory and motor nerves,
which originate essentially from the medulla and the brain stem, and
which end at one or more organs (skin, muscle, viscera, etc.) (Figure 26).
It is located outside the CNS and is formed by nerves (which are groups of
axons) originating from the brain and the spinal cord.
These nerves are lines of communication that connect all parts of the body
by transmitting impulses.
There are three kinds of nerves:
Motor nerves: originate in the brain and transmit commands to the
different parts of the body.
Sensory nerves: come from the sensory organs. They bring to our brain
visual, auditory, olfactory, gustatory and tactile sensations.
Mixed nerves: are both sensory and motor.
II.4.1. Functional organization
II.4.1.1. Somatic system
Responsible for voluntary actions, its sensory neurons transmit information
received by the receptors to the interior. Its motor neurons transmit
information to the skeletal muscles.
II.4.1.2. Autonomic System
