Fig. 7From: Analytic Modeling of Neural Tissue: I. A Spherical BidomainGeometry of the point current source at \(\mathbf {p}_{+}=(r_{+},\theta_{+},\varphi_{+})\) in relation to the origin \((0,0,0)\) and a field point \(\mathbf {r}=(r,\theta,\varphi)\), with \(R_{\mathrm{source}}\) being the distance between r and \(\mathbf {p}_{+}\) Back to article page