NEET PG DENTAL EXAM

Detailed explanation-1: -Branchial arches 1 and 2 are referred to as the mandibular and hyoid arches, respectively. Each of the arches is lined internally by endoderm and externally by ectoderm tissue. Between the endoderm and ectoderm lies the mesenchyme, composed of both mesoderm and neural crest tissue.

Detailed explanation-2: -The second pharyngeal arch forms the following muscles: the stapedius, stylohyoid, posterior belly of digastric muscle, auricular muscle and the muscles of facial expression. From its vascular component, this arch forms the embryonic stapedial artery and the caroticotympanic artery.

Detailed explanation-3: -The second pharyngeal pouch develops into the palatine tonsils, a secondary lymphoid organ playing a role in protecting the body from pathogens passing through the pharynx. The third pharyngeal pouch develops into the thymus and inferior portion of the parathyroid.