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BIOB32H3 Lecture Notes - Medial Lemniscus, Carotid Body, Nociceptor

Biological Sciences
Course Code
Kenneth Welch

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Neural Integration : Sensory Pathways and the Somatic Nervous System
An Overview of Sensory Pathways and the Somatic Nervous System
Neural pathways
Afferent pathways
Sensory information coming from the sensory receptors through peripheral
nerves to the spinal cord and on to the brain
Efferent pathways
Motor commands coming from the brain and spinal cord, through peripheral
nerves to effecter organs
Sensory Receptors and their Classification
Sensory receptor
Specialized cell or cell process that monitors specific conditions
Arriving information is a sensation
Awareness of a sensation is a perception
General senses
Physical distortion
Chemical detection
Receptors for general senses scattered throughout the body
Special senses
Located in specific sense organs
Structurally complex
Sensory receptors
Each receptor cell monitors a specific receptive field
A large enough stimulus changes the receptor potential, reaching generator
Tonic receptors
Always active
Slow acting receptors
Phasic receptors
Provide information about the intensity and rate of change of a stimulus
Fast acting receptors
Reduction in sensitivity in the presence of a constant stimulus
The general senses
Three types of nociceptor
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