Saturn Medic
Embryology (Ear)
MCQ
1 / 10
The auricle (pinna) of the external ear is innervated by which of the following nerves?
he auricle (pinna) of the external ear is innervated by cranial nerves V3 (mandibular division), VII, IX, and X; cervical nerves C2 and C3 also innervate the auricle.
2 / 10
Perilymph enters the subarachnoid space via the
The perilymph enters the subarachnoid space of the posterior cranial fossa via the cochlear aqueduct, which contains the perilymphatic duct.
3 / 10
The utricular portion of the otic vesicle gives rise to the
The utricular region of the otic vesicle gives rise to the endolymphatic sac and duct and semicircular ducts.
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The otic vesicle
The otic vesicle arises from an invagination of the surface ectoderm called the otic placode. The otic vesicle is found adjacent to the rhombencephalon.
5 / 10
The saccular portion of the otic vesicle gives rise to the
The saccular region of the otic vesicle gives rise to the cochlear duct, which houses the spiral organ of Corti.
6 / 10
Pharyngeal groove 1 gives rise to the
Pharyngeal groove 1 gives rise to the external auditory meatus.
7 / 10
The cochlear duct contains the spiral organ of Corti and is derived from which of the following?
The cochlear duct is derived from a thickening of the surface ectoderm called the otic placode.
8 / 10
The middle ear cavity
The middle ear cavity develops from pharyngeal pouch 1 as it evaginates to form the tubotympanic recess
9 / 10
The tubotympanic recess gives rise to
The tubotympanic recess is derived from pharyngeal pouch 1. It gives rise to the tympanic cavity and the auditory (eustachian) tube; the auditory tube interconnects the tympanic cavity with the nasopharynx.
10 / 10
The stapedius muscle, which moves the stapes ossicle, is innervated by
The stapes is innervated by CN VII.
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