Central Nervous System

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Presentation transcript:

Central Nervous System (Brain and Spinal Cord) Peripheral Nervous System (Nerves and Ganglia)

Peripheral Nervous System Somatic N.S. Autonomic N.S. Skeletal Muscle Parasympathetic Division Sympathetic Division Cardiac, Smooth Muscle and Glands

Somatic Nervous System (SNS) CNS One motor neuron to a single effector tissue: Effector Tissue 1. Skeletal muscle Autonomic Nervous System (ANS) Two motor neurons to many effector tissues: Effector Tissue 1. Cardiac muscle 2. Smooth muscle 3. Glands

Somatic Nervous System (SNS) One Motor Neuron to Single Effector Tissue skeletal muscle Effector Tissue is Skeletal Muscle Neurotransmitter is ACh (released from somatic motor neurons) Receptors are Nicotinic (response is always excitatory) Control is Voluntary (except reflexes)

Somatic Motor Pathway

Autonomic Nervous System (ANS) Two Motor Neurons to Many Effector Tissues 1. cardiac 2. smooth 3. glands Effector Tissue is Cardiac and Smooth Muscle and Glands Neurotransmitters are ACh and NE (released from autonomic neurons) Parasympathetic: Receptors are Nicotinic and Muscarinic Sympathetic: Receptors are Nicotinic, Alpha () and Beta () Preganglionic fibers myelinated; postganglionic are non-myelinated Control is Involuntary (except biofeedback)

Effector Tissue PARA SYM Heart Pupils   Bronchioles Lacrimal Glands Salivary Glands Digestive Activity Adrenal Gland Blood Vessels

Autonomic Pathways Somatic

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