The Nervous System PART D. PowerPoint Lecture Slide Presentation by Patty Bostwick-Taylor, Florence-Darlington Technical College
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1 PowerPoint Lecture Slide Presentation by Patty Bostwick-Taylor, Florence-Darlington Technical College The Nervous System 7 PART D
2 PNS: Spinal Nerves There is a pair of spinal nerves at the level of each vertebrae for a total of 31 pairs Formed by the combination of the ventral and dorsal roots of the spinal cord Named for the region from which they arise
3 PNS: Spinal Nerves Figure 7.25a
4 PNS: Anatomy of Spinal Nerves Spinal nerves divide soon after leaving the spinal cord Dorsal rami serve the skin and muscles of the posterior trunk Ventral rami form a complex of networks (plexus) for the anterior
5 PNS: The Spinal Nerves Figure 7.25b
6 PNS: Spinal Nerve Plexuses Table 7.2 (1 of 2)
7 PNS: Spinal Nerve Plexuses Table 7.2 (2 of 2)
8 PNS: Distribution of Major Peripheral Nerves of the Upper and Lower Limbs Figure 7.26a
9 PNS: Distribution of Major Peripheral Nerves of the Upper and Lower Limbs Figure 7.26b
10 PNS: Distribution of Major Peripheral Nerves of the Upper and Lower Limbs Figure 7.26c
11 PNS: Autonomic Nervous System Motor subdivision of the PNS Consists only of motor nerves Also known as the involuntary nervous system Regulates activities of cardiac and smooth muscles and glands Two subdivisions Sympathetic division Parasympathetic division
12 PNS: Differences Between Somatic and Autonomic Nervous Systems Nerves Somatic: one motor neuron Autonomic: preganglionic and postganglionic nerves Effector organs Somatic: skeletal muscle Autonomic: smooth muscle, cardiac muscle, and glands
13 PNS: Differences Between Somatic and Autonomic Nervous Systems Neurotransmitters Somatic: always use acetylcholine Autonomic: use acetylcholine, epinephrine, or norepinephrine
14 PNS: Comparison of Somatic and Autonomic Nervous Systems Figure 7.27
15 PNS: Anatomy of the Sympathetic Division Originates from T 1 through L 2 Ganglia are at the sympathetic trunk (near the spinal cord) Short pre-ganglionic neuron and long postganglionic neuron transmit impulse from CNS to the effector Norepinephrine and epinephrine are neurotransmitters to the effector organs
16 PNS: Anatomy of the Autonomic Nervous System Figure 7.28
17 PNS: Sympathetic Pathways Figure 7.29
18 PNS: Anatomy of the Parasympathetic Division Originates from the brain stem and S 1 through S 4 Terminal ganglia are at the effector organs Always uses acetylcholine as a neurotransmitter
19 PNS: Autonomic Functioning Sympathetic fight or flight Response to unusual stimulus Takes over to increase activities Remember as the E division Exercise, excitement, emergency, and embarrassment
20 PNS: Autonomic Functioning Parasympathetic housekeeping activites Conserves energy Maintains daily necessary body functions Remember as the D division digestion, defecation, and diuresis
21 Effects of the Sympathetic and Parasympathetic Divisions of the ANS Table 7.3 (1 of 2)
22 Effects of the Sympathetic and Parasympathetic Divisions of the ANS Table 7.3 (2 of 2)
23 Development Aspects of the Nervous System The nervous system is formed during the first month of embryonic development Any maternal infection can have extremely harmful effects The hypothalamus is one of the last areas of the brain to develop
24 Development Aspects of the Nervous System No more neurons are formed after birth, but growth and maturation continues for several years The brain reaches maximum weight as a young adult
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