Anatomy 1 physiology

1. Sensory input :

information gathered by sensory receptors about internal and external changes.

2. Integration

interpretation of sensory input

3. motor output

activation of effector organs (muscles and glands) produces a response

two functional divisions

1. Sensory (afferent) division

• Somatic afferent fibers--convey impulses from skin, skeletal muscles and joints
• Visceral afferent fibers--convey impulses from visceral organs.

2. Motor (efferent) division

Transmits impulses from the CNS to effector organs

1. Somatic (voluntary) nervous system

Consious control of skeletal muscles

2. Autonomic (involuntary) nervous system (ANS)

Regulates smooth muscle, cardiac muscle and glands

• Two functional subdivision
• Sympathetic --fight or flight
• Parasympathetic-- calm down