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Overview of Nervous

16.1--Overview of Nervous Tissue

Central Nervous System Brain and Spinal Cord; continuous via foramen magnum. Control sensory info, thoughts, emotions, memories, muscles, and glands.
Peripheral Nervous System All nervous structure outside CNS; cranial nerves, spinal nerves, ganglia, enteric plexuses, and sensory receptors
Cranial Nerves Base of brain; 12 pairs
Nerve Bundle of hundreds to thousands of axons, connective tissue, and blood vessels.
Spinal Nerves 31 pairs; Right or left side of body
Ganglia Masses of nervous tissue consisting primarily of neuron cell bodies. Located outside brain and spinal cord. Associate with Cranial and Spinal Nerves.
Enteric Plexuses Regulate Digestive System
Sensory Receptors Monitor changes in internal and external environment. Receptors in skin that detect touch.
Three Major Functions Sensory (input), integrative (control), and motor (output)
Sensory Neurons Afferent -- carry info to brain and spinal cord via cranial and spinal nerves. Can detect internal and external stimuli
Integration Analysis and storage of sensory input, allowing for decision making and responses.
Perception Conscious awareness of sensory stimuli. Occurs in brain.
Interneurous Connect with other neurons; short distance axons. Make up majority of CNS
Motor Neurons Efferent Neurons-- elicit motor response
Effectors Muscles and Glands
Somatic Nervous System Part of PNS. Consist of somatic sensory neurons and somatic motor neurons. From skin, skeletal msucles, joints and senses.
Somatic Motor Neurons Only efferent to skeletal muscles. Voluntary.
Autonomic Nervous System Autonomic (visceral) sensory neurons and auto motor neurons (to smooth muscle, glands, and cardiac muscle). Not voluntary reactions (auto)
Sympathetic Division Helps support exercise, emergency action. Wider distribution of neurons because closely connected with cardiovascualar system
Parasympathetic Division Rest and digest activites. Regulator of digestive and respiratory systems.
Enteric Nervous system Brain of Gut. Sensory neurons monitor chemical changes. Motor neurons monitor smooth muscle control and secretions.
Created by: 100000434525601



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