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Anatomy & Physiology Section 4 Cranial Bones
Anatomy & Physiology 4.9: Ethmoid Bone
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The ethmoid bone is a bone in the skull that
separates the nasal cavity from the brain.
The bone that is located at the roof of the
nose, between the two orbits, is the e______
b_____.
The e_____ b____ consists of four parts: a
horizontal or cribriform plate, a
perpendicular plate, and two lateral masses
or labyrinths.
The ethmoid sinuses of the e______ b____
are two of the four paired paranasal sinuses.
The bone that lies between the sphenoid
bone and the nasal bones of the face is the
e_____ b____.
1
The e_____ b____ consists of four parts: a
horizontal or cribriform plate, a
perpendicular plate, and two lateral masses
or labyrinths.
The superior surface of the ethmoid is
formed by the paired horizontal cribriform
plates. The part that helps form the roof of
the nasal cavities and the floor of the anterior
cranial fossa are the c______ p_____
The c_____ p____ are punctured by tiny
holes, called cribriform foramina, which
allow the olfactory nerves to pass from the
nasal cavities to the brain.
The c_______ p____ of the ethmoid bone
(horizontal lamina) are received into the
ethmoidal notch of the frontal bone and
roofs of the nasal cavities.
The c_____ p______ fit into the ethmoidal
notch of the frontal bone and supports the
olfactory lobes of the cerebrum, being
pierced with numerous openings for the
passage of the olfactory nerves.
2
The e_____ b____ consists of four parts: a
horizontal or cribriform plate, a
perpendicular plate, and two lateral masses
or labyrinths.
The c_____ p____ are punctured by tiny
holes, called cribriform foramina, which
allow the olfactory nerves to pass from the
nasal cavities to the brain.
The crista galli is a triangular process that
projects superiorly from the cribriform plate.
The outermost covering of the brain (dura
mater) attaches to the c____ g_____ and
helps secure the brain in the cranial cavity.
The anterior cranial fossa shows a crestlike
projection in the midline, called the c____
g____.
The thick crest of bone that projects above
the cribriform plate is the c____ g____.
3
The e_____ b____ consists of four parts: a
horizontal or cribriform plate, a
perpendicular plate, and two lateral masses
or labyrinths.
The c_____ p____ are punctured by tiny
holes, called cribriform foramina, which
allow the olfactory nerves to pass from the
nasal cavities to the brain.
The outermost covering of the brain (dura
mater) attaches to the c____ g_____ and
helps secure the brain in the cranial cavity.
The second part of the e______ b____ is the
perpendicular plate, which descends from
the under surface of the cribriform plate, and
assists in forming the septum of the nose.
The part of the ethmoid bone that forms the
superior part of the nasal septum, which
divides the nasal cavity into the right and left
sides, is called the p_____ p_____.
The p_____ p_____ descends from the body
of the cribriform plate to form part of the
nasal septum.
4
The vomer and the nasal septal cartilage join
the p_____ p____ to form the nose.
The e_____ b____ consists of four parts: a
horizontal or cribriform plate, a
perpendicular plate, and two lateral masses
or labyrinths.
The c_____ p____ are punctured by tiny
holes, called cribriform foramina, which
allow the olfactory nerves to pass from the
nasal cavities to the brain.
The outermost covering of the brain (dura
mater) attaches to the c____ g_____ and
helps secure the brain in the cranial cavity.
The part of the ethmoid bone that forms the
superior part of the nasal septum, which
divides the nasal cavity into the right and left
sides, is called the p_____ p_____.
5
The labyrinth or lateral mass of the ethmoid
bone consists of a number of thin-walled
cellular cavities, the ethmoidal air cells. The
part of the ethmoid bone that holds the
e_____ a____ c____ is the l_____, also
known as the lateral mass.
The mass of air cells with thin bony walls
forming part of the lateral wall of the nasal
cavity are called the e_____ a____ c_____.
The paired lateral masses of the ethmoid
bone, which contain many thin-walled
cellular cavities called e_____ a___ c____,
are called the l_____.
The lateral plate of the l_____ forms the
medial part of the corresponding nasal
cavity.
The e_____ b____ consists of four parts: a
horizontal or cribriform plate, a
perpendicular plate, and two lateral masses
or labyrinths.
6
The c_____ p____ are punctured by tiny
holes, called cribriform foramina, which
allow the olfactory nerves to pass from the
nasal cavities to the brain.
The outermost covering of the brain (dura
mater) attaches to the c____ g_____ and
helps secure the brain in the cranial cavity.
The part of the ethmoid bone that forms the
superior part of the nasal septum, which
divides the nasal cavity into the right and left
sides, is called the p_____ p_____.
The part of the ethmoid bone that holds the
e_____ a____ c____ is the l_____, also
known as the lateral mass.
Extending medially from the lateral masses,
the coiled superior, middle, and inferior
nasal conchae protrude into the nasal cavity.
Also called turbinates, the c_____ compose
most of the mucosal tissue of the nose.
7
The c_____ are responsible for filtration,
heating, and humidification of air inhaled
through the nose.
The thin, scroll-shaped bony elements
forming the upper chambers of the nasal
cavities are the c____.
The s_____, m____, and i______ c_____
increase surface area in the internal nose and
prevents dehydration by trapping water
droplets during exhalation.
The e_____ b____ consists of four parts: a
horizontal or cribriform plate, a
perpendicular plate, and two lateral masses
or labyrinths.
The c_____ p____ are punctured by tiny
holes, called cribriform foramina, which
allow the olfactory nerves to pass from the
nasal cavities to the brain.
The outermost covering of the brain (dura
mater) attaches to the c____ g_____ and
helps secure the brain in the cranial cavity.
R
8
The part of the ethmoid bone that forms the
superior part of the nasal septum, which
divides the nasal cavity into the right and left
sides, is called the p_____ p_____.
The part of the ethmoid bone that holds the
e_____ a____ c____ is the l_____, also
known as the lateral mass.
The s_____, m____, and i______ c_____
increase surface area in the internal nose and
prevents dehydration by trapping water
droplets during exhalation.
Review
The e_____ b____ consists of four parts: a
horizontal or cribriform plate, a
perpendicular plate, and two lateral masses
or labyrinths.
The c_____ p____ are punctured by tiny
holes, called cribriform foramina, which
allow the olfactory nerves to pass from the
nasal cavities to the brain.
The outermost covering of the brain (dura
mater) attaches to the c____ g_____ and
helps secure the brain in the cranial cavity.
9
The part of the ethmoid bone that forms the
superior part of the nasal septum, which
divides the nasal cavity into the right and left
sides, is called the p_____ p_____.
The part of the ethmoid bone that holds the
e_____ a____ c____ is the l_____, also
known as the lateral mass.
The s_____, m____, and i______ c_____
increase surface area in the internal nose and
prevents dehydration by trapping water
droplets during exhalation.
The e_____ b____ consists of four parts: a
horizontal or cribriform plate, a
perpendicular plate, and two lateral masses
or labyrinths.
10