NETTER’S HEAD AND NECK ANATOMY FOR DENTISTRY

Аннотация

Start forming in the 4th week of development Develop as blocks separated by pharyngeal clefts Initially, 6 arches develop, but the 5th regresses Arising from the endoderm are compartments called pharyngeal pouches that extend toward the pharyngeal clefts Help form 4 of the 5 swellings of the face: ● 2 mandibular processes (pharyngeal arch) ● 2 maxillary processes (pharyngeal arch) ● 1 frontonasal prominence Composed of: ● External surface—ectoderm ● Internal surface—endoderm ● Central part—lateral plate mesoderm, paraxial mesoderm, neural crest Skeletal components develop from the neural crest tissue Muscular structures develop collectively from the mesoderm Each arch is innervated by a cranial nerve that migrates with the muscles