PSL300H1 Lecture Notes - Hypothalamus
Document Summary
Sacral reflex (parasympathetic) reflex and programmed control o: when bladder fills up, it stretches bladder stretch receptors embedded in the muscle walls of the bladder. Pontine centers organize : 1) sequence of relaxation of external sphincter muscle and pelvic floor muscles promotes urination, 2) continence prevents urination sphincter muscles contracted. Hypothalamus (medial preoptic nuclei), amygdala, limbic frontal lobe influence pag: putting urination within social context. Maintenance of a stable, internal body environment ( milieu int rieur ) product of many physiological control circuits (negative feedback loops) o regulated by feedback loops hypothalamus is major coordinator of homeostatic control. Pag) corrective actions initiated involving autonomic, endocrine and somatomotor mechanisms (to release hormones) Interacts with brainstem motor and autonomic centers via axonal projections interacts with endocrine system via pituitary can coordinate complete physiological response to challenges to internal environment. Pituitary body provides an interface between cns and endocrine system.
