psychosomatic pain 

phantom pain 

referred pain 

somatic pain 

visceral pain

all of the choices

skin

internal organs 

tendons

joints

The area of cortex mapping input from this region is very small

All of the above

the density of its fine touch receptors is very high and the size of the receptive field of the neurons there is very small

the density of its fine touch receptors is very low and the size of the receptive field of the neurons there is very large

Of the unique presence of Pacinian corpuscles and Meissner’s disks in the fingertip

Meissner’s corpuscles and Pacinian corpuscles

Pacinian corpuscles and Ruffini endings

Merkel disks and Ruffini endings

Merkel disks and Meissner’s corpuscles

Merkel disks and Pacinian corpuscles

Both Meissner's corpuscles and Merkel's disks

Meissner's corpuscles

Both Meissner's and Pacinian corpuscles

On both cutaneous and deep mechanoreceptors

Pacinian corpuscles

Mechanically-gated ion channels

Ca++-activated ion channels

Voltage gated channels

ATP-gated ion channels

Chemically-gated ion channels

Na+ and K+ channels only

Adaptation of closed non-selective TRPV1 ion channels

Na+, K+ and Ca++ channels

Stretch that induces opening of ion channels via one of 3 possible mechanisms

Transient receptor potential V receptors selective for the different types of fine touch

chemicals

pressure

sight

sound

chemical differences

Meissner's corpuscles, Thermoreceptors, Merkel's disks and Nociceptors

Meissner's corpuscles, Merkel's disks and Pacinian corpuscles

Thermoreceptors and Nociceptors

Ruffini endings, Meissner's corpuscles, Merkel's disks and Pacinian corpuscles

Meissner'scorpuscles, Hair follicle receptors, Ruffini endings, Merkel's disks and Pacinian corpuscles