(C) Whole-mount immunohistochemistry with anti-neurofilaments antibody for visualization of peripheral nerves. In crmp2-/- embryos, the growth of ophthalmic branch of the trigeminal nerve is increased and axons are defasciculated (first and second row, arrowheads). Similarly, we detected increased growth and branching of lateral branches of spinal nerves in crmp2-/- embryos (third row, arrowheads). Trigeminal nerve (V) and its branches (Op - ophthalmic, Mx - maxillar, Md - mandibular) are indicated. Scale bars: 500 μm. 