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7 Cards in this Set

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INNER EAR

VESTIBULE
1. The vestibule is the oval, middle part of the bony labyrinth located pos-
terior to the scala vestibuli and scala tympani and anterior to the semi-
circular canals; it contains two rounded chambers of the membranous
labyrinth, the utricle and saccule
INNER EAR

UTRICLE AND SACCULE
2. The utricle and saccule are joined together by the utriculosaccular duct
from which the endolymphatic duct courses posteriorly within the ves-
tibular aqueduct, a tiny canal in the petrous part of the temporal bone;
distally, the endolymphatic duct emerges into the posterior cranial fossa
on the posterior surface of the petrous part of the temporal bone as a
dilatation called the endolymphatic sac
INNER EAR

SENSORY HAIR CELLS
(w/in u/s)
a. Sensory hair cells within the utricle and saccule sense gravity and
initiate reflex contraction of limb and trunk muscles in response to
changes in the position of the head
INNER EAR

MENIERES DISEASE
b. Clinical note: Meniere's disease is characterized by an increase in
pressure within the membranous labyrinth, which may damage its
sensory hair cells; one form of treatment is to surgically incise the
endolymphatic sac in the posterior cranial fossa to allow drainage of
excess endolymph into the subarachnoid space
INNER EAR

FORAMINA W/IN MEDIAL WALL OF VESTIBULE
3. Foramina within the medial wall of the vestibule transmit branches of
the vestibular division of the vestibulocochlear nerve to the internal
acoustic meatus; its lateral wall is perforated by the oval window
INNER EAR

SEMICIR. CANALS & DUCTS
1. Each of three tubular, archlike, semicircular canals contains a similarly
contoured semicircular duct; each semicircular canal and semicircular
duct pair lies in a different plane and, each semicircular canal and duct
is composed of two crura, one of which exhibits a terminal dilatation
called an ampulla
INNER EAR

SEMICIR. CANALS & DUCTS
-how do they open?
2. The semicircular canals and semicircular ducts open into the vestibule
and utricle, respectively; the ampullae of the semicircular ducts containsensory hair cells that sense rotational movements of the head and ini-
tiate reflex contraction of eye and neck muscles