# Example: bipolar_cell

> Note

> You can launch an interactive, editable version of this example without installing any local files using the Binder service (although note that at some times this may be slow or fail to open):

A pseudo MSO neuron, with two dendrites and one axon (fake geometry).

    from brian2 import *

    # Morphology
    morpho = Soma(30*um)
    morpho.axon = Cylinder(diameter=1*um, length=300*um, n=100)
    morpho.L = Cylinder(diameter=1*um, length=100*um, n=50)
    morpho.R = Cylinder(diameter=1*um, length=150*um, n=50)

    # Passive channels
    gL = 1e-4*siemens/cm**2
    EL = -70*mV
    eqs='''
    Im = gL * (EL - v) : amp/meter**2
    I : amp (point current)
    '''

    neuron = SpatialNeuron(morphology=morpho, model=eqs,
                           Cm=1*uF/cm**2, Ri=100*ohm*cm, method='exponential_euler')
    neuron.v = EL
    neuron.I = 0*amp

    # Monitors
    mon_soma = StateMonitor(neuron, 'v', record=[0])
    mon_L = StateMonitor(neuron.L, 'v', record=True)
    mon_R = StateMonitor(neuron, 'v', record=morpho.R[75*um])

    run(1*ms)
    neuron.I[morpho.L[50*um]] = 0.2*nA  # injecting in the left dendrite
    run(5*ms)
    neuron.I = 0*amp
    run(50*ms, report='text')

    subplot(211)
    plot(mon_L.t/ms, mon_soma[0].v/mV, 'k')
    plot(mon_L.t/ms, mon_L[morpho.L[50*um]].v/mV, 'r')
    plot(mon_L.t/ms, mon_R[morpho.R[75*um]].v/mV, 'b')
    ylabel('v (mV)')
    subplot(212)
    for x in linspace(0*um, 100*um, 10, endpoint=False):
        plot(mon_L.t/ms, mon_L[morpho.L[x]].v/mV)
    xlabel('Time (ms)')
    ylabel('v (mV)')
    show()