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Biopsychology - Divisions of the Nervous System
Divisions of the CNS/PNS and their descriptions
14
Psychology
Undergraduate 1
10/09/2012

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Term
Central Nervous System (CNS)
Definition
Brain & Spinal Cord.
"Main Computer"
Term
Peripheral Nervous System (PNS)
Definition
Everything excluding brain & spinal cord. Sensory Input.
"Cables"
Term
Somatic Nervous System (SNS)
Definition
Part of the PNS.
Interacts with external environment.
Term
Autonomic Nervous System (ANS)
Definition
Part of the PNS.
Regulates internal environemnt.
Term
Afferent (General)
Definition
Arrive. Approach. Towards.
Term
Efferent (General)
Definition
Exit. Escape. Away.
Term
Somatic Afferent Nerves
Definition
Carry sensory signals from outside to CNS. (From eyes, skin, joints, etc)
Term
Somatic Efferent Nerves
Definition
Carry motor signals from the CNS to skeletal muscles.
Term
Autonomic Afferent Nerves
Definition
Carry sensory signals from internal organs to CNS
Term
Autonomic Efferent Nerves
Definition
Carry motor signals from CNS to internal organs.
Term
Parasympathetic NS
Definition
Autonomic Efferent Nerves.
Projects from cranial and sacral (lower back) region of spinal cord.
Prepares for action. Raises heart rate, blood pressure, and breathing rate. Decreases digestion.
Term
Sympathetic NS
Definition
Autonomic Efferent Nerves.
Project from lumbar and thoracic region of spinal cord.
Calm the body. Raise digestion, lower heart rate, lower breath rate.
Term
How many pairs of spinal & cranial nerves in the PNS?
Definition
Spinal Nerves: 31 pairs
Cranial Nerves: 12 pairs.
Term
Which nerve effects all organs?
Definition
Vagus Nerve
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