NEET PG DENTAL EXAM

Detailed explanation-1: -The main function of the platysma is to contribute to producing a myriad of facial expressions. With its attachment on the modiolus and the lower lip, it can produce an expression of sadness, surprise and horror by lowering the corners of the mouth and lower lip.

Detailed explanation-2: -The cervical branch of the facial nerve (cranial nerve VII) innervates the platysma muscle. In addition, it also receives supply from the transverse cervical nerve. The primary innervation is the cervical branch; however, some parts of the muscle tissue could be innervated by the mandibular branch.

Detailed explanation-3: -The platysma was most commonly innervated by the cervical branch of the facial nerve (38.2%) or the cervical branch and mandibular branch of the facial nerve (60.5%), followed by the cervical plexus (0.6%), the cervical motor nucleus (0.6%), and the glossopharyngeal nerve (0.1%).