Midterm paper

Module 10 LO2

Nervous System Divisions

Dr. Lisa Brinn [email protected]

2. Nervous System Divisions • CNS • PNS • Basic functions:

A. Sensory (input) • Detects internal and external stimuli

B. Integrative (control) • Processing of information and making decisions for

appropriate response • Perception – conscious awareness of sensory stimuli

C. Motor (output) • Muscular contraction • Glandular secretion

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Maintain homeostasis

A. Sensory Input • Receptors in the skin sense the temperature of the water.

B. Integrative Control

C. Motor Output • Sensory input and the integration in the CNS leads to a

motor response is formulated and executed

Peripheral Nervous System

A. Somatic Nervous System • Consists of: • Somatic sensory neurons • From receptors in PNS CNS

• Somatic motor neurons • From CNS skeletal muscles ONLY

B. Autonomic Nervous System • Autonomic (visceral) sensory neurons • Visceral organs CNS

• Autonomic motor neurons • From CNS smooth and cardiac muscles; glands

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ANS Subdivisions A. Sympathetic Nervous System • Helps support exercise or emergency actions • “fight-or-flight” • Major regulator of cardiovascular system

B. Parasympathetic Nervous System • Helps support more relaxing functions • “rest-and-digest” • Major regulator of digestive and respiratory systems

C. Enteric Nervous System (“brain of the gut”) • Sensory neurons – monitor chemical changes • Motor neurons – govern contraction and secretion

Nervous System Organization

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