Card Set Information
What are the 3 functions of the nervous system?
Master controlling and communicating system
Responsible for all thought, action and emotion
Responsible for maintaining homeostasis
What are the 2 sections of the nervous system?
CNS - brain, spinal cord, integrative and control centres
PNS - cranial and spinal nerves, communication between CNS and body
What do the 4 lobes of the brain control?
Frontal lobe - personality, emotion, behaviour, cognitive
Temporal lobe - speech, memory
Parietal lobe - motor, sensory
Occipital lobe - vision
What are the 3 functional areas of the cerebal cortex?
Motor (voluntary movement
Association (integration of sensory feelings and motor control)
* No functional area of the cortex acts alone and conscious behaviour involves the entire cortex *
What are the 2 functional sub-divisions of the PNS?
(1) Sensory or afferent division - transmits TO THE CNS from receptors
(2) Motor or efferent division - transmits FROM CNS to effector organs
What are the 2 types of afferents within the Sensory or Afferent division of the PNS?
Somatic afferents = sensory fibres conveying impulses from the skin, skeletal muscle and joints
Visceral afferents = sensory fibres transmitting from the body cavity
What are the 2 sub-divisions of the motor or efferent division of the PNS?
(1) Somatic nervous system (some voluntary control)
(2) Autonomic nervous system (no voluntary control)
Describe the somatic nervous system.
Voluntary nervous system
Somatic nerve fibres conduct impulses from CNS to the skeletal muscle
Under conscious control and permits individuals to control their skeletal muscles
Describe the autonomic nervous system.
Involuntary nervous system
Regulates activity of smooth muscle, cardiac muscle and glands
Beyond our control
What are the two divisions of the autonomic nervous system?
(1) Parasympathetic division
(2) Sympathetic division
Act on the same organs but have the opposite effect = process of dual innervation that permits the body to maintain homeostasis
Describe the parasympathetic division of the autonomic nervous system.
Most active in non-stressful situations
Responsible for keeping body energy use as low as possible
-Nutrient absorbtion increases
-Smooth (involuntary) muscle activity increases
-Constriction of respiratory passageways
Describe the sympathetic division of the autonomic nervous system.
Fight or flight
Actions noticeable when excited or threatened
Responsible for permitting the body to rapidly deal with situations that threaten homeostasis