THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -Facial expressions, or microexpressions, are generated by the facial muscles, a group of mimetic muscles found underneath the skin of the face and scalp. The seventh cranial nerve (CN VII), the facial nerve, is responsible for providing motor innervation to these facial muscles, enabling you to smile or frown.

Detailed explanation-2: -The amygdalo-motor pathways and the control of facial expressions.

Detailed explanation-3: -The muscles of facial expression are innervated by the facial nerve (cranial nerve VII), and the muscles of mastication are innervated by the mandibular division of the trigeminal nerve (cranial nerve V3).