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A7: 4th arch with inferior vagal ganglion. Arch arteries (cf. B 1, B2). Cut roof of pharyngeal cavity in midline and laterally.
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 Visual System
A7: Mesencephalon. Rostral extensions of superior cardinal vein.
A7: Medial rectus m. Anlagen of nasolacrimal ducts. Upper eyelid (lateral). Lower eyelid (medial).
Development of the Auditory System
A7,B1: 1st pharyngeal pouch opening into pharynx.
