(1980) Distributions of vibrissae afferent fiber
collaterals in the trigeminal nuclei as revealed by intra-axonal injection of horseradish peroxidise.
From postnatal day 0 to day 3, the neurite of these afferent fibers
begins to refine to form outer spiral bundles, which innervate outer HCs.
In contrast, investigation of LTP in the spinal dorsal horn (DH)  is more recent, beginning twenty years after the first description of LTP in the hippocampus, and spinal DH LTP has focused largely upon the synapses formed by primary sensory afferent fibers
, because these synapses are the first checkpoint for pain signals entering the central nervous system (CNS).
Capsaicin-sensitive afferent fibers
of the common hepatic branch of the vagus project towards the rat liver (34).
It is physiologically controlled by excitatory presynaptic potentials of Ia afferent fibers
and inhibitory postsynaptic potentials from muscle spindles of antagonistic muscles.
A recent dosimetric study  revealed that a typical cochlear implant delivered, at the location of the afferent fibers
of the auditory nerve, a peak voltage of several tens of mVs, higher than the signal amplitudes used in this work ([less than or equal to] 10 mV).
For MI + SS and SS alone, this decrease may be due to the stimulation frequency, inducing homosynaptic post activation depression (HPAD) related to the repetitive stimulation of afferent fibers
. However, after MI alone, this decrease may be related to a stimulation effect at Per and/or a condition effect.
Interestingly, AF occurs with the stimulation at the wrist level (mixed-nerve stimulation) of the median nerve but is not seen with the stimulation of skin branches (digital nerve) from the second finger This may suggest that this facilitation occurs through thick afferent fibers
stemming from muscle spindles (51,53).
Excitation of lateral vestibular neurons by peripheral afferent fibers
. J Neurophysiol 1966; 29: 508.
In addition, there are individual variations of pelvic anatomy and neurophysiology, intermingling of afferent fibers
, intercommunication among nerve plexuses, and cross-talk (19).
Under physiological conditions, potentially harmful stimuli are integrated by the nociceptors of primary afferent fibers
and relayed for final processing in the supraspinal centers.
An electrode cuff is placed around the right (or left cervical vague) aiming to stimulate both the vagal efferent and afferent fibers
The possible underlying mechanism of extraordinary symptoms during supraventricular tachycardia has been supposed to be cross-talk between the cardiac afferent fibers
and cranial nerves or ganglia through the impulse propagation .
Nociceptive inflow from these suboccipital structures is mediated by smalldiameter afferent fibers
in the upper cervical roots terminating from the C2 segment up to the medullary dorsal horn [9,14,15].
Furthermore, Spinal Manipulation (SM) could have had a twofold effect, acting on (i) the skeletal muscle hypertonia, via the efferent projection from the CNS; (ii) the enteric, sympathetic, and parasympathetic systems, via the afferent fibers
located in dorsal root or cranial nerve ganglia .