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BASIC LIFE PROCESSES
Characteristics of a Cell
- Irritability- Conductivity- Contractility- Metabolism- Reproduction- Integration- Adaptation
NERVE CELLS- the basic structural unit of the
nervous system
- also called the “neuron”
- it is filled with cytoplasm, which is the living material forming the body of the cell.
- neurons vary in size.
The neuron
The nervous system is a complex communications
network controlling the body’s internal environment as well as its responses to its surroundings.
complex combination of billions of neurons
THREE TYPES OF NEURONSAfferent Neurons
- conduct nerve impulses from receptors to the brain or the spinal cord.
Internuncial or Associative Neurons
- responsible for what we commonly call thoughtEfferent Neurons
- conduct nerve impulses from the decision points to the effectors.
DIVISIONS OF NERVOUS SYSTEM
Central Nervous System
Peripheral Nervous System
The Central Nervous System
- The Central Nervous System includes the brain and the spinal cord.
- It is the decision-maker.
The Central Nervous System
Peripheral Nervous System
- It is composed of two parts
Autonomic nervous system Somatic system
Peripheral Nervous System
Autonomic nervous system - is a motor system supplying impulses to
most of the internal organs and smooth muscles of the body.
- composed of two principal divisions:Sympathetic and
Parasympathetic
The Brain - has an average weight of about three
pounds
- contains at least 15 billion nerve cells called neurons.
- composed of three principal sections:• Hindbrain• Midbrain• Forebrain
The Brain
The Principal Sections
Forebrain is composed of three parts: - Thalamus - Limbic System - Cortex
THALAMUS -switching pointLIMBIC SYSTEM - involved variety of complex human processesCORTEX - made up of four lobes which are separated by fissures
END!!!