Chapter 15 - Neural Integration I

Chapter 15 - Neural Integration I - Chapter 15 - Neural...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 15 - Neural Integration I: Sensory Pathways and Somatic Nervous System Sensory Information Afferent Division of the Nervous System: Efferent Division of the Nervous System: Sensory Receptors: specialized cells that monitor specific conditions in the body or external environment; when stimulated, a  receptor passes information to the CNS in the form of action potentials along the axon of a sensory neuron Sensory Pathways: Somatic Motor Portion of the Efferent Division controls peripheral effectors Somatic Motor Commands: nerves Somatic Nervous System (SNS): motor neurons and pathways that control skeletal muscles Sensory Receptors: General Senses  describe our sensitivity to 0. Temperature 1. Pain 2. Touch 3. Pressure 4. Vibration 5. Proprioception Sensation: the arriving information from these senses Perception: conscious awareness of a sensation Special Senses 0. Olfaction (smell) 1. Vision (sight) 2. Gustation (taste) 3. Equilibrium (balance) 4. Hearing The special senses are provided by special sensory receptors Special sensory receptors The Detection of Stimuli Receptor sensitivity:  each receptor has a characteristic sensitivity Receptive field: area is monitored by a single receptor cell; the larger the receptive field, the more difficult it is to localize a  stimulus The Interpretation of Sensory Information Arriving stimulus takes many forms: o physical force (such as pressure) o dissolved chemical o sound o light Sensations Taste, hearing, equilibrium, and vision provided by specialized receptor cells Communicate with sensory neurons across chemical synapses Adaptation: reduction in sensitivity of a constant stimulus; your nervous system quickly adapts to stimuli that are painless and  constant Tonic receptors  are always active; show little peripheral adaptation; are  slow-adapting receptors Remind you of an injury long after the initial damage has occurred Phasic receptors are normally inactive; become active for a short time whenever a change occurs; provide information about  the intensity & rate of change of a stimulus; are  fast-adapting receptors Stimulation of a receptor produces action potentials along the axon of a sensory neuron  o The frequency and pattern of action potentials contain information about the strength, duration, and variation of the  stimulus 
Background image of page 1

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

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 07/13/2011 for the course BIOL 2401 taught by Professor Watson during the Summer '10 term at Richland Community College.

Page1 / 4

Chapter 15 - Neural Integration I - Chapter 15 - Neural...

This preview shows document pages 1 - 2. Sign up to view the full document.

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