Page 5 - Edited - Webster HEAD AND NECK - part 2-Merge PDF

HN 202
(A)
CRISTA CRIBRIFORM PLATES
GALLI

LESSER
WING
SPHENOID
BODY

RIGHT LATERAL
ORBIT SC PTERYGOID
PLATES
MC

RIGHT
MAXILLARY
AIR SINUS

“ETHMOID”is
Greek for "sieve- CRISTA GALLI
like";
CRIBRIFORM is CRIBRIFORM
PLATE
Latin for "sieve- ETHMOID
like" (hence a NASAL ORBIT AIR CELLS
cribbage board). HARD (BONY) SEPTUM
PALATE
(removed) MAXILLARY
(B) AIR SINUS MAXILLARY
AIR SINUS
(A) A SCHEME OF THE NASAL CAVITY

A SEEN FROM THE FRONT & SUBJECT'S INFERIOR MEATUS
(B)
LEFT
SC SCHEMATIC TRANSVERSE SECTION AT LEVEL C-C, HN 201 Fig. B
HE NOTICE 1) Lateral walls are medial walls of the right & left maxillary air sinuses, and the
M ethmoidal air sinuses ( ).
E 2) The ethmoid bone is like two buoyancy bags (its air sinuses) joined above by the
OF cribriform plates - raft deck. The crista galli is a stumpy worst & the central plate of the
TH bone, extending downwards to contribute to the nasal septum, a sort of keel.
E
NA3) The NASAL CONCHAE (Singular CONCHA - "a shell"; ENT surgeous often use their old
SA names-TURBINATES, "agitate", "while"," - hence turbulence, turbine, turbid). Three pairs of
L delicates bones, rather like slivers taken from a pipe, suspended by one lagedge from the
CA LATERAL walls of The cavity. The SUPERIOR (SC) & MIDDLE (MC) CONCHAE are
VI extensions of the ETHMOID BONES; The INFERIOR CONCHAE are INDEPENDENT
TY BONES ATTACHED TO THE MAXILLAE. The space between the each CONCHA & the
LATERAL WALL OF THE NASAL CAVITY IS A MEATUS (plural MEATUSES & NOT
"MEATI" (ugh!) - of which there are three pairs (Superior, inferior & middle) on each side. The
arrangement increases the surface area of The cavity in order the better to warm and moisten
inhaled air.

K.E.W .