50. T.S. Lower Part of Pons
Ventral (Basilar) Part: Contains massive transverse pontine fibers, pontine nuclei, and the descending corticospinal and corticonuclear tracts. Dorsal Part (Tegmentum): Abducens Nucleus (CN VI): Located medially beneath the facial colliculus. Facial Nerve (CN VII) Fibers: The motor root of the facial nerve hooks around the abducens nucleus, forming the facial colliculus. Vestibular Nuclei: Located in the lateral area of the floor of the fourth ventricle. Medial Lemniscus: Situated at the junction of the ventral and dorsal parts, arranged horizontally (different from the vertical orientation in the medulla). Spinal Tract and Nucleus of Trigeminal Nerve (CN V): Positioned laterally. Trapezoid Body: Fibers related to the auditory pathway