Chapter 7 The Nervous System Lecture Presentation by

Chapter 7 The Nervous System Lecture Presentation by Patty Bostwick-Taylor Florence-Darlington Technical College © 2015 Pearson Education, Inc.

Figure 7. 2 Organization of the nervous system. Central Nervous System (brain and spinal cord) Peripheral Nervous System (cranial and spinal nerves) Sensory (afferent) Sense organs Motor (efferent) Somatic (voluntary) Autonomic (involuntary) Skeletal muscles Cardiac and smooth muscle, glands Parasympathetic Sympathetic

Organization of the Nervous System Nervous system is classified based on: Anatomical Structure Physiological Function(s) of the structure © 2015 Pearson Education, Inc.

Two main divisions Central Nervous System (CNS) Peripheral Nervous System (PNS)

Central Nervous System (CNS) Organs Brain Spinal cord Functions Integration; command center Interpret incoming sensory information Issues outgoing instructions © 2015 Pearson Education, Inc.

Peripheral nervous system (PNS) Nerves (extending from the brain and spinal cord) Spinal nerves —carry impulses to/from the spinal cord Cranial nerves —carry impulses to/from the brain Functions communication lines between: sensory organs the brain and spinal cord glands or muscles © 2015 Pearson Education, Inc.

Figure 7. 2 Organization of the nervous system. Central Nervous System (brain and spinal cord) Peripheral Nervous System (cranial and spinal nerves) Sensory (afferent) Sense organs Motor (efferent) Somatic (voluntary) Autonomic (involuntary) Skeletal muscles Cardiac and smooth muscle, glands Parasympathetic Sympathetic

Divisions of the PNS �Sensory (afferent) division �Nerve fibers that carry information to the CNS � Somatic sensory fibers carry information from the skin, skeletal muscles, and joints � Visceral sensory fibers carry information from visceral organs �Motor (efferent) division �Nerve fibers that carry impulses away from the CNS �Remember… �Afferent = Approaching the CNS �Efferent = Exiting the CNS © 2015 Pearson Education, Inc.

PNS- the Motor Division Subdivisions of the Efferent pathway Somatic nervous system voluntary Conscious control over skeletal muscles Autonomic nervous system involuntary controls smooth and cardiac muscles and glands Subdivisions : sympathetic (fight or flight) Parasympathetic (resting and digesting) © 2015 Pearson Education, Inc.