Dissection 14 Flashcards
What layers is the tympanic membrane made from?
Endoderm, mesoder, and ectoderm
What ear structures are derived from arch 1
the malleus, incus and tensor tympani
What ear structures are derived from arch 2
The stapes and stapedus
Which bone structure do you find the internal auditory meatus in?
The petrous
What makes ear wax?
The ceruminous glands
What CNs innervate the external inner ear?
VII, V3 (auiculotemporal) MAJOR, CN IX and X
The outside of the tympanic membrane is innervated by
V3 (major), VII, and X
The inside of the tympanic membrane is innervated by?
IX
_____ is connected to the stapes and leads to the inner ear
Oval window
Every time the stapes pushes into the oval window, the membrane of the _______ bulges out into the middle ear
Round window
What nerve runs next to the auditory canal?
Tensor Tympani
The Stapedius is embedded in?
The mastoid process
The tensor tympani gets innervation for CN ____ and attaches to the ____
V3; malleus
The Stapedius gets innervation from CN _____ and attaches to the _____
VII; Stapes
What nerve runs between the malleus and the incus?
The chorda tympani
The chorda tympani exits through?
The petrotympanic fissure
What does the Chorda tympani carry?
Preganglionic parasympathetics and special viscerosensory
The Tympanic plexus lies on top of?
The Promontory of the medial wall of the middle ear
The Facial Nerve carries special viscerosensory to?
the anterior 2/3 of the tongue
The facial nerve carries parasympathetics to?
The lacrimal gland and glands in the oral and nasal cavities
The Branchiomotor branch of CN VII innervates?
The muscles of facial expression and the stapedius
What nerves make up the nerve of the pterygoid canal?
The Greater petrosal nerve (parasympathetics) and the deep petrosal nerve (sympathetics)
What travel through the optic canal?
The optic nerve and ophthalmic artery
What bones make up the rim of the orbit?
The maxillary, frontal, and zygomatic bones
