Fig. 1From: Analytic Modeling of Neural Tissue: I. A Spherical BidomainSphere with radius \(r=a\) in an infinite conducting medium with current points source and sink at \(\mathbf {p}_{+}=(r_{+},\theta _{+},\varphi_{+})\) and \(\mathbf {p}_{-}=(r_{-},\theta_{-},\varphi_{-})\), respectively. The dot-dashed curves labeled as γ are the angles between the points’ position vectors and that of a field point \(\mathbf {r}=(r,\theta,\varphi)\) Back to article page