About This Chapter
The Peripheral Nervous System - Chapter Summary and Learning Objectives
The peripheral nervous system in humans accounts for the nerves and ganglia that aren't part of the brain or the spinal cord. It plays an essential role in communicating information and stimulus from the outside world to your brain, so you can react to it. In some cases, it will react immediately, responding the stimulus before your brain has a chance to register it like when you step on a tack. Learn about these topics and more by reading and watching the lessons in this chapter. Among other topics, we'll explore the following:
- Identifying components of the peripheral nervous system
- Breaking down the different receptors such as the chemoreceptors, mechanoreceptors, and thermoreceptors
- Explaining the role of specialized nervous systems, like the sympathetic, parasympathetic, and autonomic nervous systems
1. Peripheral Nervous System: Definition, Function & Parts
The human nervous system is very complex with many interactive units that are changing constantly to reflect human behavior and activity. This lesson focuses on the peripheral nervous system, including its function and parts.
2. Somatic Nervous System: Definition, Function & Example
One of the most complex systems in the body is the nervous system. In this lesson, you will learn about the somatic nervous system and how important it is to body functions. Examples and illustrations will be provided to assist your understanding of the lesson.
3. Chemoreceptors: Definition, Location & Function
In this lesson, we'll discuss how the cells in our bodies use chemoreceptors to detect chemicals in the environment. We'll look at where chemoreceptors are located and how they work to help us taste, smell, and breathe. Then you can test your new knowledge with a short quiz!
4. Mechanoreceptors: Definition & Function
How does the nervous system detect touch and communicate touch signals to the brain? Learn how mechanoreceptors function, the different types of mechanoreceptors, and what each type does.
5. Thermoreceptors: Definition & Function
Our senses are necessary for detecting changes in the environment. Temperature is an environmental factor that changes frequently, and our bodies have to be able to detect these changes. This article discusses thermoreceptors and their function in detecting temperature.
6. Somatic Sensory Pathways
How does information travel between body and brain? In this lesson, we'll explore somatic sensory pathways, including ascending and descending tracts, afferent and efferent nerves, and how they work together in the body.
7. Dorsal Root Ganglion: Function & Definition
All along our spinal cord, we have specialized nerves that send and receive messages to and from various parts of our body. There are particular nerve cell clusters called dorsal root ganglia that are present in the root of these spinal nerves. In this lesson, we'll discuss the function and definition of a dorsal root ganglion.
8. Autonomic Nervous System: Function, Definition & Divisions
In this lesson we'll learn the definition of 'autonomic nervous system.' The lesson explores the system's function and gives an overview of the divisions that comprise the system. A short quiz will follow.
9. The Sympathetic and Parasympathetic Nervous Systems
In this lesson, you'll learn about two subdivisions of the autonomic nervous system - the sympathetic and parasympathetic nervous systems. Watch as a hiker, Phil, runs away from a terrifying bear and see how these systems react to the impending danger!
10. Positive and Negative Feedback in the Sympathetic and Parasympathetic Nervous System
In this lesson, you'll study positive and negative feedback in the sympathetic and parasympathetic nervous systems. You'll also learn why we have a fight or flight instinct and how it works.
11. Acetylcholine: Definition, Function & Deficiency Symptoms
In this lesson, you will learn about acetylcholine, a chemical messenger that causes our skeletal muscles to contract and regulates our endocrine system. You'll find out how acetylcholine works and how a deficiency in this chemical can lead to serious medical conditions.
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Other chapters within the Biology 105: Anatomy & Physiology course
- Anatomy and Physiology Overview
- Chemical and Cellular Biology
- Tissue Biology
- Integumentary System
- Skeletal System
- Muscular System Anatomy
- Muscular System Physiology
- Introduction to the Human Nervous System
- The Central Nervous System in the Human Body
- The Five Senses
- The Endocrine System
- The Human Cardiovascular System - Blood & Heart
- The Human Cardiovascular System - Vessels & Circulation
- The Lymphatic System & Immunity
- Human Respiratory System
- Digestive System
- Urinary System
- Male and Female Reproductive Systems
- Studying for Biology 105