Lecture five of head and neck anatomy.ppt

head and neck anatomy

1. •*Maxillamade up of 2 maxillae has large body which
contains maxillary paranasal sinuses.
•*Maxillary tuberosity is a rounded eminence located behind the
last molar tooth, above this tuberosity is posterior alveolar canal
for posterior alveolar nerve.

2. •frontal,maxillary,eth
moidal,and sphenoid
para nasal sinuses
are surrounding and
opening into the
nasal cavity. Main
functions are to
resonate voice and
decrease skull
weight.

3. •*Each maxillaehas four processes :-
•I -zygomatic process to form anterior part of
zygomatic arch. 2-frontal process projected
medially to form medial wall of orbit.

4. •3-palatine process which project medially to form part of
bony palate.
•4-alveolar process which contain alveoli for roots of upper
teeth.

5. •*Hard palate:-formed anteriorly by palatine
process of maxillae while post 1/4 is formed by
horizontal plates of the palatine bones. *Median suture
between the right and left sides of hard
palate.*Transverse suture between palatine processes
of maxillae and horizontal plates of palatine bones.

6. •*Medial to last molar there is greaterand lesser palatine
foramina, which runs down from the pterygopalatine
fossa, these foramina transmit nerves and vessels of the
same name. *Anterior to palatine process of maxilla is
incisive foramen which transmits nasopalatinenerve
(branch from pterygopalatine ganglion) and terminal
branch of the greater palatine artery.

7. ORBIT:-
Roof : 1-orbital part of frontal bone. 2-lesser wing win of the
sphenoid.
Lateral wall: 1-orbital surface of zygomatic bone. 2-greater wing
of sphenoid.
Floor: I-body of Maxilla.
2-orbital plate of palatine bone at
posteromedial.
Medial wall:-
1-frontal process of maxilla.
2-lacrimal bone-
3-orbital plate of ethmoidal
labyrinth.
4-body of sphenoid.

9. *The lateral wall and floor are separated by inferior orbital fissure.
*Infraorbital groove arise from medial part of inferior orbital fissure, then
changed to a canal and opened as infraorbital foramen which transmits
infraorbital nerve (a continuation of maxillary nerve).
* Optic canal near medial end of superior orbital fissure.
*Lacrimal groove located on medial wall, the nasolacrimal canal descend from
it and opened into inferior meatus of nasal cavity.