The otic placode appears in the 3rd week of development at 22 days. The Otic vesicle appears between the 4th and 5th week of development.
Both true
First true, second false
First false, second true
Both false
Which of the following is incorrectly matched?
The ventral otocyst becomes the saccule and cochlear duct
The dorsal otocyst becomes the utricle, semicircular canals, and endolymphatic duct
The mesenchyme of the cochlear duct forms cartilage
The inner ridge forms the hair cells
None of the above
Which of the following is incorrect?
The tympanic cavity and auditory tube are from the first pharyngeal pouch
The incus and malleus are from the first pharyngeal arch
The external auditory meatus is from the first pharyngeal cleft
The auricle comes from the first pharyngeal cleft
The stapes come from the 2nd pharyngeal arch
The inner layer of the optic cup forms the pigment of the retina and the outer layer forms the neural layer. The optic cup forms from the choroid fissure.
Both statements true.
The sphinctor and dilator pupillae muscles develop from the mesoderm of the optic cup. The iris develops from the tip of the optic cup
SHH represses PAX2 at the midline and positively regulates PAX6. PAX2 regulates eye development, PAX6 regulates optic stalk differentiation
