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A2,A3: Otocyst, otic capsule, rhombencephalon and rhombomeres.
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. identify the optic cup and stalk, which are derived from the forebrain B2-6. Caudally one can identify the spinal cord along the entire length of the embryo.
Development of the Auditory System
A2: Otocyst (R). Apex of otocyst (origin of L endolymphatic sac)
