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44 Cards in this Set
- Front
- Back
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Three subdivision
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External
Middle Inner |
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External
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Gathering sound
tympanic both external and middle |
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Middle ear
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transmits sound
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internal ear
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converts mechanical sound to nerve impulses
static and kinetic changes in balance |
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Petrous ridge ear orientation
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structures either perpendicular or parallel to it
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outer one third of external acoustic meatus
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cartilagenous
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interior two thirds of ex acoustic meatus
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bony
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Relations of External Acoustic Meatus
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An- TMJ
SUP- epitympanic recess Post- mastoid air cells |
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Blood supply EAM
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superficial temporal artery
deep auricular branch of maxilla posterior auricular |
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nerve of EAM
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great auricular
lesser occipital auriculotemporal auricular branch of X |
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Tympanic Cavity Wall Roof (tegmental wall)
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Features: none
Realations: DA TEMPORAL LOBE |
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Floor Tympanic Cavity (jugular wall)
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Features: none
Relations: Internal Jugular vein |
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Lateral (membranous wall)
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Features: Tympanic membrane
manubrium chorda tympani Relations: External acoustic meatus |
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Anterior (carotid wall)
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Features:
Ostium of auditory tube opening of semicanal for tensor tympani Relations: Internal carotid tensor tympani auditory tube |
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medial (labyrinthine wall)
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FEATURES:
eminence of lat semi canal emience of facial canal oval window promontory tympanic plexus round window Relations facial nerve vestibule basal turn of cochlea (promontory) |
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Posterior (mastoid wall)
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Features:
aditus ad antrum opening for chorda tympani pyramid containing stapedius mm Relations mastoid antrum mastoid air cells |
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muscles of ear
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Tensor tympani (malleus insertion) V
Stapedius-stapes insertion VII |
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nerve supply of ear
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tympanic plexus (IX)
carotid plexus twig IX tympanic branch afferent and parasympathetic pres (otic ganglion) |
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Internal ear
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oblique T formation
facial and greater petrosal cochlea semicircular canals |
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Bony labyrinth
(peri lymph and membranous endolymph) 5 |
vestibule (utricle and saccule)
semicircular canals (semicircular ducts) cochlea (cochlear duct) perilymphatic and coclear aqueduct aqueduct of vestibule (endolymphatic duct) |
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Membranous labryinth6
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cochlear duct
utricle saccule semicircular ducts endolymphatic duct and sac ductus reuniens |
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Development external ear
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1 pharyngeal cleft and six mesencymal swellings
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Development middle ear
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first pouch
first two arches |
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development inner ear
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ectodermal otic vesicle and surrounding mesoderm
rhombencephalon |
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Dorsal portion of otic vesicle creates (3)
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utricle
semicircular ducts endolymphatic duct |
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ventral otic vesicle formation
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saccule
cochlear duct ductus reuniens |
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Bony labyrinth formation
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mesenchyme surrounding otic vesicle gets a shell (otic capsule)
scala vestibuli scala tempani |
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Middle ear
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tympanic cavity 1st pouch
endoderm distal end tympanic cavity proximal Eustachian tube pneumatization- mastoid air cells by erosion |
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tympanic membrane
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ectoderm of meatal plug
mesenchyme of 1 and 2 pouches endoderm of fist pouch |
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all of theses contain air
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mastoid antrum
epitympanic recess mastoid air cells EAM |
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vestibule
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no air
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the facial nerve is in what wall?
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medial (labyrinthine)
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mucosa of tympanic cavity
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IX
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chorda tympani is
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lateral wall
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Features of the temporal bone include (4)
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arcuate eminence
petrous ridge tegmen tympani styloid process |
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Head of malleus is located in
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the epitympanic recess
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chorda tympani
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submandibular gland
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tympanic plexus nerve fiber
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synapse in the otic ganglion
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cough reflex?
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external acoustic meatus
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cochlear duct is formed from the
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otic vesicle
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otic placode is thickening of the
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surface ectoderm
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internal acoustic meatus
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not epithelial first pouch
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utricle derived directly from
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otic vesicle
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motor nucleus of trigeminal
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reflex arc for loud noises
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