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B1: Division of 1st arch into mandibular and maxillary components on one side (undivided on other side due to alignment of embryo at sectioning). Dorsal portion of hypopharyngeal hypo-branchial) eminence. Prominent 3rd arch artery, dorsal aortae. Rathke's pouch (derived from ectoderm anterior to the buccopharyngeal membrane). prosencephalon. Note thin pharyngeal pouch/groove membranes.
DEVELOPMENT OF THE NERVOUS SYSTEM
B1-7: Forebrain.
Development of the Visual System
B1: Developing diencephalon. Rathke's pouch. Lens pit (derived from thickened ectoderm of lens or "optic" placode).
B1: Optic nerve. Note extensive temporal region of retina. Anlagen of nasolacrimal ducts.
Development of the Auditory System
A7,B7: 1st pharyngeal pouch opening into pharynx.
