> Produces rigidly programmed, automatic behaivors necessary for survival.
Brain stem consists of the
> Contains cerebral peducles (motor tracts, substantia nigra (produces dopamine), tegmentum (houses red nuclei, helps maintain posture), Tectum (Also called quadrigemina)
>Contains fiber tracts that complete conducting pathways between the brain and spinal cord.
> The pontine nuclei relay information from the cerebrum to the cerebellum.
> Also houses nuclei for cranial nerves V, VI, VII, VIII, and IX.
> Pontine sleep center, which initiates rapid eye movement sleep
> Pontine respiratory center, which works with the respiratory centers in the medulla to help control respiratory movements.
3) Medulla oblongata:
>Pyramids: houses motor projection tracts (corticospinal or pyramidal tracts) most of which cross to the opposite side (decussation)
> Cranial nerve nuclei
> Part of the reticular formation
> Cardiac center: regulates heart rate and force of contraction
> Vasomotor center: controls blood pressure
> Medullary respiratory center: regulates respiratory rate
> Nuclei that are involved in coughing, sneezing, salivation, swallowing, gagging and vomiting