=====Am I really tracing neurons in the human brain?===== Actually, no. You're tracing neurons in the retina of a mouse. A mouse's retina is similar to a human retina in many ways.
额，并不是，你正在描绘一只老鼠的视网膜神经元。不过，老鼠的视网膜与人类的视网膜有不少方面相似。
