Which of these is true regarding the development of the ear? A) The internal aspect of the ear forms from the otic placode, a thickening of the surface ectoderm. B) The ear begins to form in the 8^th week of development. C) The external acoustic meatus develops from mesoderm. D) The auricle develops from the otic pit.

Question

Quizplus · Accepted Answer

The development of the internal aspect of the ear starts with the otic placode, a thickening of the surface ectoderm that forms in the 3rd week of development. The other options are incorrect. The ear starts to form in the 4th week of development (not the 8th), the external acoustic meatus develops from the ectoderm (not mesoderm), and the auricle develops from six auricular hillocks (not from the otic pit).

Which of These Is True Regarding the Development of the Ear