[Python] 3D quiver arrow look

I´m trying to plot an arrow inside a sphere and have the following code

u, v = np.mgrid[0:2*np.pi:20j, 0:np.pi:10j]
x = np.cos(u)*np.sin(v)
y = np.sin(u)*np.sin(v)
z = np.cos(v)
fig = pl.figure(figsize=(20,15))
ax = fig.gca(projection='3d')
ax.quiver(0, 0, 0,blocx[0], blocy[0], blocz[0],color="b",linewidth=5)
ax.plot_wireframe(x, y, z, color ='#15B05E')

ax.view_init(30, 70)
pl.show()


where the blocx, y and z are some data I have. As a result, I get this:

but I´d like the arrow head to be like a cone, as well as smaller in size, how can I do that?

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