The vagus nerve is part of the group of cranial nerves responsible for innervation of structures derived from the branchial arches. It is also part of a group together with the glossopharyngeal and accessory nerves that passes through the jugular foramen which is termed the vagus group.ranial nerves are those nerves which arise from the brain and brain stem rather than the spinal cord. Nerves arising from the spinal cord are the peripheral nerves. There are 12 pairs of cranial nerves and these pairs of nerves passage through foramina in the skull, either individually or in groups.
Resistivity and conductivity are reciprocals: Ï = 1 / Ï {\displaystyle \rho =1/\sigma } . Resistivity is a measure of the material's ability to oppose electric current. This formula is not exact, as it assumes the current density is totally uniform in the conductor, which is not always true in practical situations.
Thermal conductivity is a material property. It will not differ with the dimensions of a material, but it is dependent on the temperature, the density and the moisture content of the material. The thermal conductivity of a material depends on its temperature, density and moisture content.The thermal conductivity normally found in tables is the value valid for normal room temperature. This value will not differ much between 273 and 343 K (0 â 70Â° C).onductance Vs Conductivity. Conductivity (k) is a material property and means its ability to conduct heat through its internal structure. Conductance on the other hand is an object property and depends on both its material and thickness. Conductance equals conductivity multiplied by thickness, in units of W/mÂ²K.