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Atlas of Human Embryos Chapter   Figure

C-1 myotome, C-1 neural crest, aortic arch 2, aortic arch 4, aortic sac, c-1 - c-2 intercrest region, c-1 dermatome, dorsal thalamus, epithalamus, hypothalamus, mandibular prominence of pharyngeal arch 1, maxillary prominence of pharyngeal arch 1, pharyngeal pouch 1, pharyngeal pouch 2, pharyngeal pouch 4, precardinal vein, prosencephalon (diencephalic part), prosocoele (forebrain ventricle), sternocleidomastoid / trapezius premuscle mass, stomodeum, sulcus limitans, sulcus medius, thyroid diverticulum, ventral thalamus

A section through the C-1–C-2 intercrest region, thyroid diverticulum and aortic sac.

Observe:
1. The stomodeum separating the maxillary and mandibular processes.
2. Pharyngeal pouches 1 through 4 and their relation to the aortic arches in the floor of the primitive pharynx.
3. The origin of the aortic arches from the aortic sac.
4. Myoblastic collection ventral to the C-1 myotome forming the sternocleido-mastoid-trapezius premuscle mass.
5. The close relation of the C-1 neural crest to the C-1 myotome.


Keywords: C-1 myotome, C-1 neural crest, aortic arch 2, aortic arch 4, aortic sac, c-1 - c-2 intercrest region, c-1 dermatome, dorsal thalamus, epithalamus, hypothalamus, mandibular prominence of pharyngeal arch 1, maxillary prominence of pharyngeal arch 1, pharyngeal pouch 1, pharyngeal pouch 2, pharyngeal pouch 4, precardinal vein, prosencephalon (diencephalic part), prosocoele (forebrain ventricle), sternocleidomastoid / trapezius premuscle mass, stomodeum, sulcus limitans, sulcus medius, thyroid diverticulum, ventral thalamus

Source: Atlas of Human Embryos.