. Author manuscript; available in PMC: 2012 Dec 1.

Published in final edited form as: Int J Dev Neurosci. 2011 Aug 12;29(8):847–854. doi: 10.1016/j.ijdevneu.2011.08.002

Table 3.

Glabrous Skin Mechanosensitive Neuron Properties from P7 and P28 Rats In Vivo

Somatic Electrical Properties												Neuron Properties
Passive						Active
Passive						AP			AHP

	Age	n	Em, mV	Ri, MΩ	τ, ms	Amplitude, mV	MRD	MRR	D50, ms	Amplitude, mV	AHP50, ms	MT, mN	CV, m/s
LTMR	P7	25	-65 (11)	111 (31)	1.9 (1.1)	45 (9)	132 (62)	-77 (28)	1.0(0.4)^*^†	7 (4)^†	5.1 (3.3)^†	0.02 (0.007-0.07)^†	5.6 (2.4)^*
LTMR	P28	26	-65 (7)	98 (34)	1.7 (1.1)	39(8)^†	152 (63)	-81 (36)	0.7 (0.2)^†	8 (2)^†	5.4 (2.7)^†	0.04 (0.007-0.07)^†	15.1 (5.9)^†

HTMR	P7	26	-60 (12)	126 (31)	2.4 (1.5)	62 (12)^* AHTMR 60 (12) CHTMR 67(11)	124 (39)	-75 (23)	1.5 (0.5)^‡ AHTMR 1.4 (0.4) CHTMR 2.1 (0.6)	10 (4)	9.9 (3.8)	15 (0.16-98)	1.9 (1.3)^* AHTMR 2.1 (1.3) CHTMR 1.1(0.7)
HTMR	P28	31	-64 (12)	117 (39)	1.8 (1.1)	52 (11)^‡ AHTMR 50 (11) CHTMR 61 (12)	150 (76)	-78 (36)	1.2 (0.8)^‡ AHTMR 0.9 (0.4) CHTMR 2.1 (1.2)	11 (4)	9.0 (4.2)	15 (0.39-98)	8.5 (5.1)^† AHTMR 10.7 (3.2)^‡ CHTMR 0.6 (0.3)

Numbers are presented as means with standard deviation in parentheses, except for MT which are medians and ranges.

LTMR=Tactile=low threshold mechanoreceptor, HTMR=high threshold mechanoreceptor, AHTMR=A-fiber HTMR and CHTMR=C-fiber HTMR. Postnatal day 7 rat=P7, postnatal day 28 rat=P28. Symbols:

significant difference between the P7 and P28 LTMR or HTMR

^†

significant difference between the LTMR and the HTMR of P7 or P28

^‡

significant difference between the AHTMR and CHTMR.