2. Nervous System

3. Objectives: Student s will be able to: Identify dendrites, cell body, axon of a neuron Differentiate the structure and function of a motor and sensory neuron Compare the location and functions of central and peripheral nervous systems Differentiate the functions of the sympathetic and parasympathetic divisions of ANS

4. INTRODUCTION Nervous system is the chief controlling and coordinating system of the body. It controls and regulates all voluntary and involuntary activities of human body. There are three characteristic properties of nervous system of human body: Sensitivity, Conductivity and Responsiveness

5. Nervous System Interesting Facts Main parts Unit of Nervous System Division Central Nervous System Peripheral Nervous System Function Encephalon Spinal Cord Autonomic Nervous System Sense Organs Sympathetic Nervous System Parasymphatetic Nervous System Cranial and Spinal Nerves Somatic Nervous System

7. Control Regulate Communicate Mental activity center: Learning Memory Homeostasis

8. The nervous system is made of: The encephalon **The nerves The spinal cordThe senses

9. Nervous System is divided in:

10. Central Nervous System The Central Nervous System controls everything in the body. It contains the nerves of the encephalon and spinal cord

11. Encephalon

12. The Encephalon has three main parts: 1. The Cerebrum 2. The Cerebellum 3. The Brainstem

14. Areas and lobs of the cerebrum

16. The Brain Stem connects: The brain The spinal cord. The nerves in the brainstem control your: heartbeatbreathingblood pressure

18. All parts of the nervous system lying outside the brain and spinal cord. It carry messages between the central nervous system and the rest of the body. It is an automatic System

19. It controls: Body’s activities that you don’t think about. Activities in your small intestine BreathingHeartbeat controls

20. Cranial Nerves and Spinal Nerves

21. Cranial nerves Humans have 12 pairs of cranial nerves (sensory/motor/mixe d) which control the head, face, neck, shoulderssensory/motor/mixe d Except VAGUS nerve – controls internal organs

22. Somatic nerves control skeletal muscles, bones, and skin. Sensory neurons Mixed Neuron Motor neurons

23. Carry impulses from pain receptors in the skin to the central nervous system (brain and spinal cord)

24. Carry impulses from CNS to effectors muscles to make movement through the secretion of a hormone.

26. Human have 31 pairs of spinal nerves (mixed) which take impulses to and from the spinal cord

27. The peripheral nervous system is made of the senses organs, those organs are:

28. The eye is one of your sense organs. The eye is made of the iris and the pupil. The eye gathers pictures and sends them to the brain.

29. Vision is your ability to see. Vision involves the eye and the brain.

30. Hearing starts when some of the sound waves go into the ear. When a sound is made, the air around the sound vibrates.

31. The nerves in the skin allow us to feel texture, pressure, heat, cold, and pain.

32. The nose controls your sense of smell. The nose is able to smell 80 different kinds of smells

33. Mouth and TASTE Your sense of taste comes from the taste buds in the tongue. Taste buds are the parts on the tongue that allow us to taste. The four kinds of taste buds are sweet, sour, bitter, and salty.

34. Autonomic nerves control the muscles of the glands and internal organs which we can’t control Sympatheti c component s Work in conjunction/oppositi on to each other Parasympath etic components

38. The “funny bone” is the only place on the arm where a nerve is not protected.

39. THANK YOU