A short presentation about the Peripheral Nervous System or PNS.

1. Peripheral Nervous System
Report by: Klyde Daxx Asuncion

2. Peripheral nervous system
• Consists of all the nervous tissue outside the CNS.
• Components
1. Cranial Nerves and Spinal Nerves
2. Sensory Receptors
3. Ganglion
4. Plexus
• Functional subdivisions
1. Sensory Division (Afferent Division)
2. Motor Division (Efferent Division)

3. Components
1. Cranial Nerves and Spinal Nerves
• A nerve is a bundle of nerve fibers, called axons, and their sheaths
• There are 12 pairs of cranial nerves that originate from the brain and;
• 31 pairs of spinal nerves that originate from the spinal cord.
2. Sensory Receptors
• are the endings of neurons, or separate, specialized cells that detect
temperature, pain, touch, pressure, light, sound, odor, and other stimuli.
• Sensory receptors are located in the skin, muscles, joints, internal organs, and
specialized sensory organs, such as the eyes and ears.

4. Cranial and Spinal Nerves

5. Sensory Receptors

6. Components
3. Ganglion
• is a collection of neuron cell bodies located outside the CNS.
4. Plexus
• is an extensive network of axons and, in some cases, neuron cell bodies,
located outside the CNS

7. Ganglion and Plexus

8. Functional Subdivisions
1. Sensory Division (Afferent Division)
2. Motor Division (Efferent Division)

9. 1.Sensory Division (Afferent Division)
• transmits electrical signals, called action potentials, from the sensory
receptors to the CNS.

10. 2. Motor Division
• transmits action potentials from the
CNS to effector organs, such as
muscles and glands.
• Is divided into two subdivision:
1. Autonomic Nervous System
2. Somatic Nervous System

11. Somatic Nervous System
• voluntary division
• allows us to consciously control movements of our skeletal muscles.
Synapse - is the junction of a neuron with another cell.

12. Autonomic Nervous System
• controls our unconscious activities
• Such as:
1. Contraction of smooth muscles and,
2. Cardiac muscles
3. And secretion by certain glands.
• Subdivided into two
1. Sympathetic
2. Parasympathetic

13. The Subdivisions of ANS
1. Sympathetic Nervous System
• most active during physical activity
2. Parasympathetic Nervous System
• regulates resting functions, such as digesting food or emptying the urinary
bladder.

14. Enteric Nervous System
• consists of plexuses within the wall of the digestive tract.
• monitor and control the digestive tract independently of the CNS
through local reflexes.
• CNS can override enteric functions via parasympathetic and
sympathetic actions.
• the ENS is an independent subdivision of the PNS that is integrated
with the ANS.

15. The Spinal Nerves

16. Dermatomal Map