Explore the intricacies of the trochlear nerve, also known as the fourth cranial nerve (CN IV), in this comprehensive neuroanatomy video. Delve into the structure and function of the superior oblique muscle, one of the extraocular muscles, and its innervation by CN IV. Learn about the location of the trochlear nerve nucleus in the midbrain and its role in eye movement. Examine the cavernous sinus syndrome and its impact on the trochlear nerve. Gain a deeper understanding of this somatic motor nerve's significance in neurological function and potential clinical implications.