BIOL 1050H Lecture Notes - Lecture 4: Central Nervous System, Peripheral Nervous System, Spinal Nerve

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18 May 2018
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Professor
Nervous system
Internal communication
Endocrine and nervous system maintain internal coordination
1. Endocrine system
• uses hormones secreted into blood
• “long-distance” communication
• slow
2. Nervous system
• uses electrical and chemical means
• sends message from cell to cell
• very quick (e.g. reflexes, perception)
Nervous system components
Central nervous system (CNS)
• Brain and spinal cord
• Enclosed by cranium and vertebral column
Peripheral nervous system (PNS)
• Everything else distributed through body: cranial and spinal
nerves, ganglia
• Composed of nerves and ganglia
• Nerves - bundle of nerve fibres (axons) wrapped in fibrous
connective tissue
• Ganglion - knot-like swelling in a nerve where neuron cell
bodies are concentrated
• Two divisions (sensory and motor), each with somatic and
visceral subdivisions
Nervous system organization: input/ output
1. Sense organs receive information
and transmits coded messages to
the CNS
Information: patterned
changes in body or external
environment
2. CNS processes the information,
determines appropriate response
3. CNS issues commands to muscles
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