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Principles of Health Science 2012
Peripheral nervous system is made of all of the nerves. PNS consists of cranial nerves and spinal nerves.
12 pairs and their branches Originate in the brain Cranial Nerves
Some are responsible for special senses such as sight, hearing, taste, and smell.
Some receive general sensations such as touch, pressure, pain, and temperature, and send out impulses for involuntary and voluntary muscle control
31 pairs and their branches Carry messages to and from the spinal cord Both sensory (afferent) and motor (efferent) nerves Spinal Nerves
Consists of the following pairs: 8 cervical 12 thoracic 5 lumbar 5 sacral 1 coccygeal
Each nerve goes directly to a particular part of the body or networks with other spinal nerves to form a plexus that supplies sensation to a larger segment of the body.
Important part of the peripheral nervous system Helps maintain a balance in the involuntary functions of the body BUT also allows the body to react in times of emergency Autonomic Nervous System
There are two divisions of the ANS: Sympathetic Parasympathetic
Sympathetic and parasympathetic work together Functions include: 1. Maintain a balanced state (homeostasis) 2. Control involuntary body functions at proper rates
Acts in times of emergency: fight or flight Prepares body to act Increases heart rate and respirations Raises blood pressure Slows activity in digestive tract Sympathetic Nervous System
Counteracts actions of sympathetic after the emergency Slows heart rate and respirations Lowers blood pressure Increases activity in digestive tract Parasympathetic Nervous System
The Nervous System Dont get nervous about the nervous system.
Principles of Anatomy and Physiology
Anatomy of the Nervous System Central nervous system (CNS) Brain Spinal cord Peripheral nervous system (PNS) Nerve outside the brain and spinal.
Peripheral Nervous System Chapter 8. Peripheral Nervous System Nerves connecting the brain and spinal cord to other parts of the body.
WRITE DOWN EVERYTHING IN BOLD Hint Hint : By Krystal, Aimee, Karisma…. And Tyler.
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JAMES VALLEY VOCATIONAL TECHNICAL CENTER. Neuron: Nerve Cell n Basic structural unit nervous system n Consists of: –nucleus –nerve fibers /dentrites –axon.
Chapter 7:6 The Nervous System.
Spinal Cord and Nerves.
Related Anatomy UNIT 7 Peripheral NERVOUS SYSTEM.
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An Introduction to the Nervous System The Nervous System – Includes all neural tissue in the body – Neural tissue contains two kinds of cells 1.Neurons.
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Two types of cells in the peripheral nervous system * SENSORY NERVOUS CELLS *MOTOR NERVOUS CELLS.
+ Peripheral Nervous System. + PERIPHRAL NERVOUS SYSTEM PNS LIES OUTSIDE THE CENTRAL NERVOUS SYSTEM COMOSED OF NERVES NERVES = BUNDLES OF AXONS WE CALL.
Spinal Cord & Peripheral Nervous System Anatomy Lesson 6.
Nervous System Supplies information about internal and external environment.
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