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Lecture 4

BIOTECH 3PM3 Lecture Notes - Lecture 4: Central Nervous System, Peripheral Nervous System, Sympathetic Nervous System

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McMaster University BIOTECH 3PM3 Pharmacology Week 04
Introduction of the Autonomic Nervous System
Nervous System Organization
Central Nervous System (CNS)
-Compromised of the brain and spinal cord
-Integrates and analyses signals
Cell body = nuclei , axons = tracts
Peripheral Nervous System (PNS)
-outside the brain and spinal cord
-relays sensory information to the CNS; motor commands
-cell body = ganglia , axons = nerves
Main function of the PNS is to connect the CNS to the limbs and organs
PNS is further divided;
Sensory : CNS receives and interpret via afferent nerves
Motor : CAN receives and interprets via efferent nerves
The Motor division is further divided into;
Somatic : Voluntary
Visceral : Involuntary
Overview of the ANS
-the ANS is composed of the nerves that travel to smooth and cardiac muscles
-these two types of involuntary muscle groups possess autorhymicity, which allows them to initiate their
own contractions
-smooth muscle tissues are found in glands and on organs
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