/********************************************************************
Taken from Grunditz A, Holbro N, Tian L, Zuo Y and Oertner TG
Spine neck plasticity controls postsynaptic calcium signals through
electrical compartmentalization
J Neuroscience (2008) 28: 13457-13466
*************************************************/



/********************************************************************
Create a spine with a spine neck 
connected to the parant dendrite dendA5_00
*************************************************/

{create spine_neck}
{dendA5_00 connect spine_neck(0),0.8}
{access spine_neck}
necklength = 1  /*spine neck length in um*/
neckdiam = 0.0394 /*spine neck diameter*/
spine_neck {nseg = 2
            pt3dclear()
            for j = 0, nseg-1 {
                ty = (j*necklength)/(nseg-1)
                pt3dadd(97.58,ty,20.87,neckdiam)
                }
            }

{create spine_head}
{spine_neck connect spine_head(0), 1}
{access spine_head}
spineradius = 0.297
spine_head {nseg = 7
            pt3dclear()
            for i = 0, nseg-1 {
                ty = -(i*2*spineradius)/(nseg-1)
                td = 2*sqrt(spineradius^2-(ty+spineradius)^2)
                if (td<neckdiam){
                    td = neckdiam
                    } 
                    pt3dadd(97.58,ty+1,20.87,td)
                }
            }