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 44 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.