Brain Regions and Plasticity: Hindbrain to Plasticity
Hindbrain and Midbrain
- Hindbrain includes the cerebellum, the medulla, and the pons.
- Medulla attaches to the spinal cord; controls functions such as breathing, maintaining muscle tone, and regulating circulation.
- Pons: bridge of fibers that connects the brainstem with the cerebellum; involved in sleep and arousal.
- Cerebellum: located adjacent to the back surface of the brainstem; coordinates fine muscle movement, balance.
- Midbrain: the segment of the brainstem that lies between the hindbrain and forebrain.
The Forebrain
- The largest and most complicated region of the brain. Subcortical structures include:
- Thalamus, where all sensory information (except smell) must pass to get to the cerebral cortex.
- Hypothalamus, near the base of the forebrain, helps regulate basic biological needs.
- Limbic system, located along the border between the cerebral cortex and deeper subcortical areas, regulates endocrine function in response to emotional stimuli; linked to the experience of emotions, but exact mechanisms of control not yet well understood.
The Cerebrum: The Seat of Complex Thought (1 of 2)
- Cerebral cortex: The outer layer of the cerebrum. Responsible for most complex mental activities, including learning, remembering, thinking, and consciousness.
- Cerebral hemispheres: The right and left halves of the cerebrum separated in the center of the brain by the longitudinal fissure that descends to a thick band of fibers called the corpus callosum.
- Corpus callosum: The major structure that connects the two cerebral hemispheres. Each hemisphere is divided into four lobes 4 lobes.
The Cerebrum: The Seat of Complex Thought (2 of 2)
- Occipital lobe: Includes the cortical area where most visual signals are sent and visual processing is begun.
- Parietal lobe: Includes the area that registers the sense of touch.
- Temporal lobe: Contains an area devoted to auditory processing.
- Frontal lobe: Contains the principal areas that control the movement of muscles.
The Plasticity of the Brain
- Research shows: Aspects of experience can sculpt features of brain structure.
- Damage to incoming sensory pathways or the destruction of brain tissue can lead to neural reorganization.
- The adult brain can generate new neurons, in a process called neurogenesis.
- Research suggests that the brain is not hard wired and neural wiring of the brain is flexible and constantly evolving. That said, this plasticity is not unlimited.