the muscles of facial expression are derived from the second pharyngeal arch of the pharyngeal gill arches.
the muscles of facial expression are derived from the second pharyngeal arch of the pharyngeal gill arches.
the muscles of facial expression are derived from which of the pharyngeal gill arches?
second pharyngeal arch
the muscles acting on the lips are considered part of the muscles of facial expression. all muscles of facial expression are derived from the mesoderm of the second pharyngeal arch, and are therefore supplied (motor supply) by the nerve of the second pharyngeal arch, the facial nerve (7th cranial nerve). the muscles of facial expression are all specialized members of the panniculus carnosus, which attach to the dermis and so wrinkle, or dimple the overlying skin. functionally, the muscles of facial expression are arranged in groups around the orbits, nose and mouth.









































the muscles acting on the lips:









































bullet::::- buccinator
lip
pharyngeal arch









































the pharyngeal arches —also known as visceral arches"—"are structures seen in the embryonic development of vertebrates that are recognisable precursors for many structures. in fish the arches are known as the branchial arches or gill arches.









































in the human embryo, the arches are first seen during the fourth week of development. they appear as a series of outpouchings of mesoderm on both sides of the developing pharynx. the vasculature of the pharyngeal arches is known as the aortic arches.









































in fish, the branchial arches support the gills.









































section::::structure.
pharyngeal arch