The name is absent



Table II Units of the passive membrane. Modified from Paul Sajda (2002)

Symbol

SI units

Physical meaning

Notes

Ra

^ω

Axial (intracellular) resistance

For a segment of cable
with a fixed length and
fixed diameter

Re_____

^ω

Extracellular resistance

Rm___

^ω

Membrane resistance

Cm___

F

Membrane capacitance

_ri_______

Ω∕m

Cytoplasmic resistivity

For unit length of cable
with fixed diameter

re______

Ω∕m

Extracellular resistivity

rm____

Ω.m

Membrane resistivity

cm____

F/m

Membrane capacitance

Ra

Ω.m

Specific axial resistance

For unit length and unit
diameter (i.e. unit volume
or surface area of cable)

RE

Ω.m

Specific extracellular resistance

Rm___

Ω.m2

Specific membrane resistance

Gm___

S.m-2

Specific membrane conductance

CM

F/m2

Specific membrane capacitance

Vm

V

Transmembrane voltage

These physical parameters are linked according to the following equations:
where d is the diameter of the neural projection and l is its length.

(56)

(57)

(58)


Rm


=ril=


RM


πdl


RA


Cm=cml=πdlCM


34



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