Reflexes 1 Flashcards
what are the different fibre types, based on conduction velocity?
\+ Aα \+ Aβ \+ Aγ \+ Aδ \+ B \+ C
what is the conduction velocity, diameter and function of Aα fibres?
+ 70-120 m/s
+ 12-20 μm
+ proprioception, somatic motor
what is the conduction velocity, diameter and function of Aβ fibres?
+ 30-70 m/s
+ 5-12 μm
+ touch, pressure
what is the conduction velocity, diameter and function of Aγ fibres?
+ 15-30 m/s
+ 3-6 μm
+ motor to muscle spindles
what is the conduction velocity, diameter and function of Aδ fibres?
+ 12-30 m/s
+ 2-5 μm
+ pain, temperature
what is the conduction velocity, diameter and function of B fibres?
+ 3-15 m/s
+ 1-3 μm
+ preganglionic autonomic
what is the conduction velocity, diameter and function of C fibres?
+ 0.5-2 m/s
+ 0.1-2 μm
+ postganglionic sympathetic, pain and possibly heat, cold and pressure
what are the different fibre types, based on sensory function?
\+ IA \+ IB \+ II \+ III \+ IV
what is the origin and equivalent fibre (based on conduction velocity) of IA?
+ muscle spindles
+ Aα
what is the origin and equivalent fibre (based on conduction velocity) of IB?
+ golgi tendon organs
+ Aα
what is the origin and equivalent fibre (based on conduction velocity) of II?
+ muscle spindles; touch and pressure receptors
+ Aβ and Aγ
what is the origin and equivalent fibre (based on conduction velocity) of III?
+ pain and temperature receptors
+ Aδ
what is the origin and equivalent fibre (based on conduction velocity) of IV?
+ pain and other receptors
+ C
where is each muscle controlled by a pool of motor neurons?
+ anterior part of spinal cord (anterior horn)
alpha motor neurons are also known as what?
lower motor neurons