Chhaparwal R.,Sri Aurobindo Medical College and Post Graduate Institute Anatomy |
Mittal P.S.,Sri Aurobindo Medical College and Post Graduate Institute Anatomy |
Joshi S.S.,Sri Aurobindo Medical College and Post Graduate Institute Anatomy |
Joshi S.,Sri Aurobindo Medical College and Post Graduate Institute Anatomy
Journal of Morphological Sciences | Year: 2013
Objectives: To determine the extent of the platysma muscle bilaterally, and also its facial extent and variations in its morphology, if any. Introduction: Platysma muscle is considered insignificant functionally. It helps in the depression of mandible, drawing the lower lip, and angle of mouth downwards and laterally in expression of horror and surprise. The extent of the muscle may be variable; the medial margins may meet in the midline, above as well as below the hyoid. Methods: In 20 cadavers bilaterally we have measured the distance between the medial borders of the platysma: i) 5 cm and 10 cm above the suprasternal notch (SSN); ii) the width of the muscle in the middle of the neck and iii) where it crosses over the angle of the mandible. We have also observed the number and extent of the decussation of fibers in the mid-line. Result: The distance between the medial margins above the SSN was variable at different levels: 5cm above SSN - 24.05 mm, and 10 cm above SSN - 21.77 mm, thereby indicating the convergence superiorly. Below the symphysis menti the decussation was absent in 32%. The width of the muscle was variable and ranged from 35.72 mm to 76.57 mm. Width of the fibres crossing superficial to the the angle of the mandible ranged from 16.84 mm to 53.56 mm. In some cases there was no attachment to the base of mandible and the fibres passed on to the face. In two instances there was broad decussation above suprasternal notch. Conclusion: The platysma muscle may have significant facial extension and variations.