First Brain: Reptilian Brain

The First Brain to Develop (Reptilian): The Brainstem and Cerebellum First to evolve, more than 500 million years ago, was the brainstem, the junction where the spinal cord connects to the base of the brain. The most primitive brain area, it makes up the majority of brain matter in reptiles and lizards. Scientists of old called this the reptilian brain, because it resembles the entire brain of a reptile. The brainstem primarily supports the basic life functions, including the maintenance and control of heart rate and breathing . These life functions are common to all species of animals. The brain stem also has the job of regulating our various levels of wakefulness and sleep. Both wakefulness and levels of alertness are controlled by the brainstem to a greater extent than by the higher centers of the neocortex. The cerebellum, or little brain , is also part of our first, or reptilian, brain. Its wrinkles and folds give it a distinct appearance. Relatively large compared to other brain structures, it is a three-lobed structure attached to the brainstem at the very back of the skull, underneath the hindmost area of the neocortex. Recent functional brain scans reveal that the cerebellum is the brain's most active area. Scientists believe the cerebellum is responsible for balance, coordination, proprioception , and the execution of controlled movements. In coordinating movement, the cerebellum performs both a motor (excitatory) function as well as a braking (inhibitory) function. Certain types of simple actions and responses are learned, coordinated, memorized, and stored in the cerebellum. For example, once a person learns how to ride a bicycle, it requires very little conscious memory to perform this action. After a skill is learned and memorized-wired to the cerebellum-our body can perform the action automatically with very little conscious thought. Hardwired attitudes, emotional reactions, repeated actions, habits, conditioned behaviors, unconscious reflexes, and skills that we have mastered are all connected to and memorized in the cerebellum.

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Impressive & deep dettailing..
Good information
Informative
Thank you doctor
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