Upload By : Ahmed Ali Abbas Babylon University College of Dentistry download this file from Website on Google  TheOptimalSmile.wix.com

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Babylon University College of DentistryBabylon University College of Dentistry
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3. 1-F.caecum: in front of crista galli , in the median plane at fronto-
ethmoidal suture . Transmitting emissary veins from upper nose
to the sup.sagittal sinus , but it's usually blind.
FORAMINA IN ANT. CRANIAL FOSSA

4. 2-Olfactory F.: in the cribriform plate of
ethmoid , 15-20 in number on each side, for
passage of olfactory n. from upper 1/3 of nose to
olfactory bulb.
3-Ant. and Post. Ethmoid F.:
-Ant.: in the suture joining lateral margins
of cribriform plate of ethmoid , and
orbital plate of frontal , behind crista galli
-Post.: in the posterolateral of cribriform plate of
ethmoid where it's articnlates with
jugum of sphenoid.
***Both ant. and post. ethmoid f. , transmit n. and
vessels of same name.

5. Fractures of anterior cranial fossa:
*Involve cribriform plate lead to epistaxis accompany by discharge of
C.S.F and loss of smell.
**Fracture involve orbital plate of frontal bone lead to subconjunetival
which my lead or produce exophthalmus or frontal sinus my
involved.
CLINICAL NOTES

7. Ant. ___ lesser wing of sphenoid.
Lat. ___ squamous part of temporal and
parietal.
Post. ___ ant. part of petrous of temporal.
Its shape like butterfly:
-Median part is form by body of sphenoid
bone.
-Lateral part is form by petrous part of
temporal and sequamous part.
B- MIDDLE CRANIAL FOSSA

8. 1-Optical canal: in the sphenoid between the body and two roots of
lesser wing. Transmit- optic n. and ophthalmic artery inferolateral
to the n.
2-Sup. Orbital fissue: in the sphenoid , between body and two
wings. Transmit- oculomotor , trochlear , abducent nerves
lacrimal ,frontal,nasociliary nreves,superior of ophthalmic vein.
FORAMINA IN MIDDLE CRANIAL FOSSA

9. 3-F. Rotundum: in the greater wing of sphenoid infero lateral to
medial end of sup. Orbital fissure .transmits max. division of V
nerve.
4-F. Ovale: in the greater wing of sphenoid ,postero- lateral to f.
rotundum , opens in the base of skull at the root of L.
pterygoid plate.
Transmits- mand. n. , lesser petrosal n. , accessory meningeal art.
and emissary veins from cavernous sinus to pterygoid
plexus.

10. 5-F. Spinosum: in the greater wing of sphenoid , also it's
posterolateral to foramen ovale.
**Transmits middle meningeal art. and branch of mand. nerve.
( nervous spinosus) and middle meningeal vein.

11. 6-F. lacercum:
between the sphenoid , apex of petrous temporal and
basilar part of occipital b., usually filled by cartilage
during life , but may transmit meningeal branch of
ascending pharyngeal art. and emissary veins from
cavernous sinus to pterygoid plexus , it also transmit
(I.C.A) entering from behind and emerging above, also
transmit greater petrosal n. (inter from above and
behind leaving ant. as n. pterygoid canal. Opens in
base of skull at root of median ptergoid plate.

12. 7-Carotid canal: nternal carotid artery enter and reach the side of body of
sphenoid, then enter cavernous sinus to reach the region of anterior
clinoid process.

13. Fractures in middle cranial fossa is common site of fractures of skull.
Because of its position and weakened by numerous foramen and canals, so
frequently tegman tympani if fracture and tympanic membrane is torn,so
blood and C.S.F are discharged from ear.
CLINICAL NOTES

14. Ant. ___ post part of petrous of temporal
Lat. ___ parietal and mastoid process of temporal
Post. ___ occipital
Inf. ___ foramen magnum
**largest and deepest cranial fossa and lodges the hindbrain
(cerebellum,pons,medalla oblangata(.
C- POST. CRANIAL FOSSA:

15. 1-Int. acoustic meatus: in post sur. of petrous temporal
Transmit- Facial , vestibulocohlear nerves , labyrinthine artery.
2-Jugualr F.: between jugular f. and occipital b.
Tansmits- 9,10,11th , inf petrosal sinus , IJV , menigeal branch of
occipital artery.
FORAMINA IN POST. CRANIAL FOSSA

16. 3-Hypoglossal canal: in occipital b. above ant. part of condyle .
transmit- hypoglossal n. and it's meningeal branch and
also emissary veins from basilar plexus of veins to IJV.
4-Condylar canal: from the lower part of sigmoid groove in lateral
of occipital b. to condylar fossa on ext. sur. of occipital b. behind the
condyle . transmits emissary veins (from sigmoid sinus to occipital
veins and meningeal branch of occipital artery.

17. 5-Mastoid F.: in petrous temporal near post. margin of lower part of
sigmoid groove , passing backwards to open behind mastoid
process.
Transmits – emissary veins ( from sigmoid sinus to occipital veins) , also
meningeal branch of occipital artery.

18. 1-Olfactory n. ___ smell sense
2-Optic n. ___ sight
3-Oculomotor ___ muscles of eye ball
4-Trochlear n.
5-Trigeminal n.
6-Abducent n.
7-Facial n.
8-Anditory n.
9-Glossopharyngeal n.
10-Vagus n.
11-Accessory n.
12-Hypoglossal n.
CRANIAL NERVES: