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U.S. NATIONAL MUSEUM BULLETIN 273 



works his is said to be partially based. The anteromedial bundles of the 

 platysma converge toward the symphyseal region of the mandible. 

 Lateral fascicles pass horizontally across the lateral aspect of the face 

 right below the ear and zygomatic arch to reach the angle of the mouth. 

 Those in between have an intermediate direction. The clavicular and 

 lower cervical fibers insert (1) on the basis mandibulae and higher up, 

 along a line which corresponds with the reflection of the oral mucosa, 

 on (2) the corpus from the juga alveoraria to the level of the first or 

 second molar. A few of them enter the lower lip superficial to m. orbic- 

 ularis oris and end about 1 cm. from the oral aperture. The platysma 

 fibers attaching in relation to the incisors are more abundant and the 

 muscle looks stronger here. Schreiber (1928) said that some of them 



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Figure 6. — Facial musculature (1, m. auricularis anterior et superior; 2, mm. frontalis and 

 orbito-auricularis; 3, m. corrugator supercilii; 4, zygomatico-orbital plate; 5, m. naso- 

 labialis; 6, m. orbicularis oris; 7, m. triangularis; 8, m. platysma colli et faciei; 9, m. 

 depressor helicis; 10, m. antitragicus; 11, m. tragohelicinus; 12, m. auricularis posterior; 

 13, m. occipitalis). 



