Development of the Platysma Muscle and the Superficial Musculoaponeurotic System (Human Specimens at 8–17 Weeks of Development)
Figure 1
(a) Human embryo GI4 (26.5 mm GL; 8 weeks of development). Frontal section. Azocarmine staining. The cervical lamina (CL) extends towards the mandibular region enclosing the masseter muscle (MS). Arrowhead: infraorbital lamina. Bar: 200 μm. (b) Human embryo GI4 (26.5 mm GL; 8 weeks of development). Frontal section. Azocarmine staining. The mandibular extension of the cervical lamina (CL) and the infraorbital lamina (IL) are visible. Bar: 200 μm. (c) Magnification of (b). The parotid acini are surrounded by condensed mesenchyme, anlage of the capsula propia of the parotid gland (arrowheads). Arrows: mandibular extension of the cervical lamina. Bar: 50 μm.
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