Lecture 18

Lecture 18 - Unit #9 Unit The Nervous System The Peripheral...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
Unit #9 Unit #9 The Nervous System The Nervous System The Peripheral Nervous The Peripheral Nervous System System
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Peripheral Nervous System  Peripheral Nervous System  PNS is the nervous system outside the brain and spinal cord Provides vital links to the body and outside world Nerves allow the CNS to receive information and initiate action Contains sensory inputs and motor outputs Categorized as Somatic or visceral General or special
Background image of page 2
Fig. 14.1 Central nervous system (CNS) Peripheral nervous system (PNS) Motor (efferent) division Sensory (afferent) division Sympathetic division Parasympathetic division Somatic sensory General: Touch, pain, pressure, vibration, temperature, and proprioception in skin, body wall, and limbs Special: Hearing, equilibrium, vision Visceral sensory General: Stretch, pain, temperature, chemical changes, and irritation in viscera; nausea and hunger Special: Taste, smell Somatic nervous system Motor innervation of all skeletal muscles Autonomic nervous system (ANS) Motor innervation of smooth muscle, cardiac muscle, and glands
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Basic Structural Components of PNS Basic Structural Components of PNS Sensory receptors pick up stimuli from inside or outside the body Can be free nerve endings of sensory neurons or complete receptor cells Nerves and ganglia Nerves bundles of peripheral axons Ganglia clusters of peripheral neuronal cell bodies Motor endings axon terminals of motor neurons Innervate effectors (muscle fibers and glands)
Background image of page 4
Peripheral Sensory Receptors Peripheral Sensory Receptors Receptors can be classified based on: Location Exteroreceptors sensitive to stimuli arising from outside the body Interoreceptors receive stimuli from internal viscera Proprioceptors l ocated in skeletal muscles, tendons, joints, and ligaments Stimulus detected Mechanoreceptors, thermoreceptors, chemoreceptors, photoreceptors, nociceptors Structure Special senses and general sensory receptors (free nerve endings & encapsulated nerve endings)
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Lamellar corpuscle (deep pressure) Hair follicle receptor (hair movement) Free nerve endings (pain and temperature) Bulbous corpuscle (pressure) Tactile corpuscle (touch, light pressure) Epithelial tactile complexes (light touch) Epidermis Dermis and hypodermis Secondary sensory endings (type II fiber) γ Efferent (motor) fiber to muscle spindle Primary sensory endings (type Ia fiber) Connective tissue capsule Muscle spindle Tendon
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 33

Lecture 18 - Unit #9 Unit The Nervous System The Peripheral...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online