Protriptylin ( Vivactil 1  ) Chemical Name: Protriptyline HCIBrand Name: Vivactil Manufacturer: Merck and CompanyDescription: Anti-depressant of unknown mechanism. Indication and Use: Vivactil is indicated for the treatment of depression in patients who are under close medical supervision.
The optic nerve (also known as cranial nerve II) is a continuation of the axons of the ganglion cells in the retina. There are approximately 1.1 million nerve cells in each optic nerve. The optic nerve, which acts like a cable connecting the eye with the brain, actually is more like brain tissue than it is nerve tissue. visual pathway
Overview. The optic nerve transmits the special sensory information for sight. It is one of two nerves that do not join with the brainstem (the other being the olfactory nerve, CN I). Embryologically, the optic nerve is developed from the optic vesicle, an outpocketing of the forebrain.