Shared Flashcard Set

Details

Chapter 6
Touch and vision
8
Medical
Undergraduate 2
03/18/2015

Additional Medical Flashcards

 


 

Cards

Term

 

What is a

mechanoreceptors ?

Definition

 Sensory receptors that are sensitive to physical distortions (e.g., bending or stretching)

 


Monitor contact with the skin

Pressure in heart and blood vessels

Stretching of digestive organs and urinary      

 bladder 

 

 

Term

 

What influences 
tatile sensory

information?

(F.A.C.T.E.)

Definition

1.Movement accuracy


2.Movement consistency


3.
Movement timing


4.
Movement force adjustments


5.
Estimates of movement distance 

Term

What typical research method mesures tactile information?

Definition

 

Compare performance of task involving finger(s) before and after anesthetizing finger(s) 

Term
What is Proprioception?
Definition

 

Prefix “proprio” meaning “from within the body”

What are some examples of proprioceptive information?

Positions of the joints

Forces produced in the muscles

Orientation of the body in space (e.g., feeling of being upside down) 

Term

What role does Propiroception play

in Open and Closed loop systems? 

Definition

 

Closed-loop control system: proprioceptive information plays an important role


 

Open-loop control system: proprioceptive information plays a lesser role 

Term
Muscle Spindles
Definition

 

Found in most skeletal muscles

  •  


     Aligned parallel to Skeletal Muscles

  •  Sensory nerve fibers (type Ia) are wrapped around muscle spindle

  •  Each muscle spindle consists of 3-10 intrafusal muscle fibers


     Main functions:

Detect changes in muscle length

(How much a muscle is being stretched)


Detect changes in velocity

(How fast muscle is being stretched)

Term

 

Golgi-Tendon 
Orans (GTOs) 
Definition

 

  • Located in skeletal muscle near the insertion of the tendons into the muscle


     

  •  Consists of type Ib sensory axons


     

    Main functions:

    • Detect changes in muscle tension, or force

    • Poor detectors of changes in muscle length 


      • GTOs use sensory (or Ib afferent) fibers to send proprioceptive information to the dorsal horn


      • Sensory fibers from GTOs synapse on interneurons in ventral horn

        •  Interneurons synapse with alpha motor neurons

        •  Transmit inhibitory impulses to contracting muscle 

       

Supporting users have an ad free experience!