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A5: Trigeminal ganglion, facial ganglion, large head (superior (anterior) cardinal) vein lateral to inferior (cut) end of otocyst, mesencephalon (midbrain). 2nd pharyngeal arch.Vagus nerve in lateral wall of superior cardinal vein.
DEVELOPMENT OF THE NERVOUS SYSTEM
Al-7: Midbrain and hindbrain. The isthmus can be observed on A3-4 as a constriction between the mid- and hind-brain. The hindbrain is already subdivided into two parts, the slim myelencephalon and the wider metencephalon. The boundary between these two parts is roughly at the level of the otic vesicles A3-4.
Development of the Auditory System
A5: Facial ganglion (R). "Floor" of L otocyst. Note on R, the former position of theotocyst in relation to the 2nd pharyngeal arch.
