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This lab covers Exercise 16 . Introduction to nervous tissue. (all exercises refer to those in your Seeley’s Anatomy and Physiology spiral bound lab manual) LABORATORY INVESTIGATION OBJECTIVES 1. Describe and identify the various divisions of the nervous system. 2. Know the three parts of a neuron (nerve cell) and identify and define the following terms: dendrites, neuron cell body, nucleus, axon hillock, axon, Schwann cell, Node of Ranvier, myelin sheath, presynaptic terminals and collateral axon 3. Know the three functional types of neurons. 5. Identify the following structures: interneuron, spinal cord, dorsal root ganglia, sensory (afferent) neuron, spinal nerve, motor (efferent) neuron, sensory receptor and effector organ 5. Identify the structures of the synapse and describe what is happening at that synapse. COMPLETE THE FOLLOWING Organization of the Nervous System Match each term below with the proper letter a-e in the image on the right. 1. _____ Parasympathetic 2. _____ Sensory (afferent) 3. _____ Peripheral Nervous System (cranial and spinal nerves) 4. _____ Somatic 5. _____ Autonomic Instructions: Identify the choice that best completes the statement or answers the question. 6. _____ The two structural subdivision of the nervous system are the: ____ nervous system and ____ nervous system. a. central; peripheral b. somatic; autonomic c. parasympathetic; sympathetic d. autonomic; sympathetic 7. _____The sympathetic and parasympathetic nervous systems are subdivisions of the ____. a. central nervous system b. voluntary nervous system c. autonomic nervous system d. somatic nervous system e. peripheral nervous system 8. _____Fibers that carry information from skin, joints, and skeletal muscles to the CNS are:___. a. motor b. visceral sensory c. somatic sensory d. interneurons (association neurons) e. parasympathetic Match the following: INTRODUCTION TO NERVOUS TISSUE

Nerve Tissue Structure and Function Using the figure above, identify the following: 14. _____ Which label above represents the processes that transmit incoming messages toward the cell body? 15. _____ Which label above represents the metabolic center of the neuron? 16. _____ Which label above represents the axon terminals? 17. _____ Which label above represents the axon? 18. _____ Which label above represents the gaps between Schwann? 19. _____ Which label above represents the nucleus of the neuron? 9. _____ Structural subdivision of the nervous system that consists of the brain and spinal cord 10. _____ Functional nervous system subdivision that carries information from receptors toward the central nervous system 11. _____ Structural subdivision of the nervous system that consists of spinal nerves and cranial nerves 12. _____ Subdivision of the motor division that is responsible for controlling involuntary events 13. _____ Functional nervous system division that carries information from the central nervous system toward effectors a. Sensory (afferent) division b. Peripheral nervous system (PNS) c. Central nervous system (CNS) d. Motor (efferent) division e. Autonomic nervous INTRODUCTION TO NERVOUS TISSUE

Match each description below with the correct neuron above. 20. _____ Bipolar Neuron 21. _____ Unipolar Neuron 22. _____ Multipolar Neuron 23. _____ Motor and all association neurons 24. _____ Sensory neurons in some special sense organs 25. _____ Neuron that conducts nerve impulses both toward and away from the cell body Multiple choice 26. _____ Bipolar neurons are commonly ____. a. motor neurons b. called neuroglia c. found in ganglia d. found in the eye and nose e. more abundant in adults than in children 27. _____ The cell bodies of the ____ neurons are always located within the CNS. a. proprioceptor b. afferent c. motor d. sensory 28. _____ Myelinated fibers form ___ matter while unmyelinated fibers form ___ matter. a. sensory; motor b. gray; white c. motor; sensory d. white; gray 29. _____The Schwann cell forms a myelin sheath around the ____. a. dendrites b. cell body c. nucleus d. axon e. nodes of Ranvier 30. _____ The major role of the interneuron (association neuron) is to ____. a. carry information from the central nervous system to muscles and/or the viscera b. form a lipid-protein (lipoprotein) cell membrane on the outside of axons c. transmit nerve impulses from the skin and organs to the central nervous system d. connect motor and sensory neurons in their pathways e. detect the amount of stretch in skeletal muscles or tendons and their joints 31. _____ Neurons with several processes branching off the cell body, such as motor neurons and interneurons (association neurons), are structurally classified as ____. a. efferent b. multipolar c. afferent d. bipolar e. unipolar Match each description below to the correct term a-q. 32. _____ Cells in the PNS that form the myelin sheaths around nerve fibers are called_____. INTRODUCTION TO NERVOUS TISSUE

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33. _____ Support cells in the central nervous system are collectively called ____. 34. _____ Part of the neuron that typically conducts nerve impulses away from the cell body is the ____. 35. _____ Gaps between Schwann cells found at regular intervals in PNS neurons are called ____. 36. _____ Sensory receptors located in muscles and tendons are termed ____. 37. _____ Bundles of nerve fibers (neuron processes) running through the CNS are called ____ 38. _____Bundles of nerve fibers running the PNS are called _____. 39. _____ Structures with cell bodies in the CNS that connect sensory and motor neurons in neural pathways are known as_____. 40. _____ Type of glial cell that forms the myelin sheath in the central nervous system are called _____. 41. _____The neuron processes that normally receive incoming stimuli are called ____. 42. _____ Unmyelinated nerve fibers are known as ____. 43. _____Ganglia are collections of ____. Each term may be used only once. Not all terms will be used. a. Ependymal cells b. Cell bodies c. Axon(s) d. Dendrite(s) e. White matter f. Proprioceptor(s) g. Tracts h. Nerve(s) i. Neuroglia j. Gray matter k. Interneuron (association neuron) l. Oligodendrocytes m. Astrocyte(s) n. Nodes of Ranvier o. Schwann cells p. Satellite cells q. Cell bodies INTRODUCTION TO NERVOUS TISSUE

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