NEET PG DENTAL EXAM

Detailed explanation-1: -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.

Detailed explanation-2: -Fourth pouch Derivatives include: superior parathyroid glands and ultimobranchial body which forms the parafollicular C-Cells of the thyroid gland. Musculature and cartilage of larynx (along with the sixth pharyngeal arch). Nerve supplying these derivatives is Superior laryngeal nerve.

Detailed explanation-3: -The first, most anterior pharyngeal arch gives rise to the oral jaw. The second arch becomes the hyoid and jaw support. In fish, the other posterior arches contribute to the branchial skeleton, which support the gills; in tetrapods the anterior arches develop into components of the ear, tonsils, and thymus.

Detailed explanation-4: -Second branchial arch: Arch: stapes, the body of the hyoid, lesser horn of hyoid, muscles of facial expression, and CNVII. Pouch: palatine tonsil.