Nervous Control, The Sensory System (physiology) Flashcards
What does the afferent division of PNS consits of?
-Receptors
- Sensory neurons
-Sensory pathways
What does the efferent division of the PNS consist of?
- Nuclei
- Motor tracts
- Motor neurons
Four types of sensations?
-Superficial sensation
-Deep sensation
-Visceral sensation
-The special senses
What are sensory receptors and how do they function?
These are specialized cells that monitor specific conditions.
When stimulated, the transmit information to the CNS in the form of an action potential that travels in the axons of sensory neurons.
What role do sensory pathways act and how?
They deliver somatic and visceral information to their final destinations in the CNS using the nuclei, tracts and nerves.
What are sensory modalities, give 4.
Unique type of sensation
Pain, touch, vision or hearing.
Two divisions of the sensory modalities
General senses
Special senses
What are examples of the general senses?
Temperature
Pressure
Touch
Proprioception
Vibration
Pain
What are the examples of special senses?
Olfactory
Vision
Gustation
Hearing
Balance
What do we mean when we say receptors are transducers ?
They convert various forms of energy into action potentials.
What are the differences btwn the three sensory neurons?
Simple receptors- Have free nerve endings.
Complex neural receptors- have nerve endings enclosed in a connective tissue capsule.
Special senses receptors- have specialized receptor cells and they usually release neurotransmitters onto sensory neurons initiating an action potential.
What are the four types of sensory receptors?
Exteroceptors
Proprioceptors
Interoceptors
Telecasters
Four general sensory receptors
Nociceptors
Thermoreceptors
Mechanoreceptors
Chemoreceptors
Where are the pain receptors located?
Superficial portion of the skin.
Around the walls of blood vessels
In the periostea of bone
In joint capsules
Where are thermoreceptors found?
The dermis
The hypothalamus
Skeletal muscles
The liver