A Afferent Fibers

These are types of sensory afferent nerve fibers that are myelinated (encased in amyelin sheath), and are classified according to their conduction velocity and sensory modality.      
Aβ fibers are medium diameter afferent fibers with conduction velocities of 30-80 ms, and encode signals from non-noxious stimuli such as touch.    

A Fibers

A Fibers (A-Fibers)

Theterminology refers to compoundaction potentialdeflections; A fibers are the most rapidly conducting category representing activity of myelinated fibers. Most A fibers are afferent nerve fibers that carry non-noxious somatosensory information.

* A Afferent Fibers (Neurons)
* Opiates During Development

Abdominal Pain

Leading symptom in some parasitic infections (Angiostrongyliasis costaricensis, → Ascariasis in children, → Capillariasis, → Dipylidiasis, → Echinococciasis, → Gnathostomiasis, → Mansonelliasis, → Strongyloidiasis, → Taeniasis, → Toxocariasis, → Trichuriasis).