PAT 20A/B Chapter 51: Week 6 - Disorders of Brain Function
8 Mar 2017
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Document Summary
Manifestations include sensory, motor, and cognitive function changes and changes in consciousness. Focal injuries result in focal neurologic deficits without altered consciousness. Consciousness is divided into 1. arousal and wakefulness and 2. content and cognition. Arousal and wakefulness require functioning cerebral hemispheres and reticular activation system. Content and cognition are determined by a functioning cerebral cortex. The reticular activating system receives input from multiple sensory pathways and constitute the central core of the brain stem. Is extends from the medulla through the pons to the midbrain. Fibres project to ans and motor systems. Hypothalamus integrates the somatic, visceral, and endocrine inputs from ras to maintain homeostasis. The ras starts at the medulla, then the midbrain, then the cortex. The ascending ras transmits activating information to cerebral cortex which activates the hypothalamic and limbic structures (emotional and behavioural) which facilitates activation of cortical neurons which increases loc. Loc is awareness of and response to environment.
