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Promontorium

Promontorium is a Latin anatomical term used to denote a projecting eminence on a bone. In human anatomy it is employed to name several well-defined surfaces where a part of a bone protrudes into or toward a cavity. The term is often encountered in older or more descriptive texts and is typically used in the plural as promontoria.

Two of the most commonly described promontoria are the sacral promontory and the cochlear promontory. The sacral

The cochlear promontory, or promontorium cochleae, is a rounded bony eminence on the medial wall of the

Other bones may have promontoria noted in anatomical descriptions, reflecting the general meaning of promontorium as

Etymology: promontorium comes from Latin promontor, to project forward.

promontory
is
the
anterior
edge
of
the
base
of
the
sacrum,
at
about
the
level
of
the
first
sacral
vertebra.
It
marks
a
boundary
between
the
abdominal
and
true
pelvic
cavities
and
serves
as
a
key
reference
point
in
obstetrics
and
pelvic
measurements,
as
well
as
in
radiologic
assessment.
middle
ear
cavity.
It
is
formed
by
the
basal
turn
of
the
cochlea
and
is
overlain
by
the
tympanic
plexus
of
nerves.
The
promontory
serves
as
an
important
anatomic
landmark
in
otology
and
is
relevant
to
the
orientation
of
surrounding
structures
such
as
the
oval
and
round
window
niches.
any
projecting
part
of
a
bone.
The
term
emphasizes
the
prominence
of
a
structure
rather
than
a
specific
functional
unit,
and
its
exact
usage
can
vary
among
sources.