Development of the Platysma Muscle and the Superficial Musculoaponeurotic System (Human Specimens at 8–17 Weeks of Development)

<table>Schematic diagram of the arrangement of the anlage of the superficial musculoaponeurotic system (S). The platysma muscle (PL) derives from the cervical lamina and its mandibular extension. The depressor labii inferioris (DA) and depressor anguli oris (DL) muscles derive from the mandibular lamina. The zygomaticus major muscle (Z) derives from the infraorbital lamina. The superficial layer of the temporal fascia (SF) and the auricularis (AM) and temporoparietalis (TP) muscles originate from the temporal lamina.</table>

The Scientific World Journal

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Figure 9

Figure 9: Development of the Platysma Muscle and the Superficial Musculoaponeurotic System (Human Specimens at 8–17 Weeks of Development) 