Head Passageway

Front 1

Anterior and posterior ethmoidal canals.
(passageway)

Back 1

(structures passing through)

Anterior and posterior ethmoidal artery, vein and nerve

Front 2

Cribriform Plate
(passageway)

Back 2

1)Olfactory neuroepithelium (CN1),
2) internal nasal branches of anterior ethmoid nerve,
3) lateral and septal nasal branches of anterior ethmoid vessels.

Front 3

Meningocele
(clinical)

Back 3

The foramen cecum does not close during developement allowing herniation of meninges, csf, and brain tissue to protrude into the nasal vacity. This is due to the failure of the small midline nasofrontal fontanelle between the paired frontal and the nasal bones to close.

Front 4

Carotid Canal
(passageway)

Back 4

(structures passing through)
-Internal carotid artery -internal carotid nerve plexus (sympathetics)

Front 5

(passageway)
Carotid Sulcus

Back 5

(structures passing through)
Curved groove found lateral to the sella tucica at the articulation of the body and greater wing of the sphenoid bone.

Front 6

(passageway)
Foramen Lacerum

Back 6

(structures passing through)
-Meningeal branch of ascending pharyngeal artery
-meningeal lymph vessel
-emissary veins from cavernous sinus to pterygoid plexus of veins

Front 7

(passageway)
Foramen Ovale

Back 7

(structures passing through)
Mandivular nerve (v3)
-lesser petrosal nerve (sometimes)
-emissary vein
-accessory meningeal artery

Front 8

(passageway)
Foramen Rotundum

Back 8

(structures passing through)
Maxillary nerve V2 into the pterygopalatine fossa.

Front 9

(passageway)
Foramen Spinosum

Back 9

(structures passing through)
Middle meningeal artery, recurrent meningeal branch of V3

Front 10

(passageway)
Hiatus for the lesser petrosal nerve

Back 10

(structures passing through)
Lesser petrosal nerve
in the suture betwen the petrous temporal and sphenoid bones

Front 11

Hiatus for the greater petrosal nerve of the facial canal
(passageway)

Back 11

Greater petrosal nerve, superior petrosal branch of the middle meningeal artery
(passthru)

Front 12

Optic Canal
(passageway)

Back 12

Found at the lateral ends of the chiasmatic sulucs CNII
-sympathetic nerves from internal carotid plexus,
-opthalamic artery
(passthru)

Front 13

Optic Chiasmatic Sulcus
(passage)

Back 13

Groove for the optic chiasma found between the guhum of the sphenoid and tuberculum sellae

Front 14

Pterygoid Canal
(passageway)

Back 14

Never of the pterygoid canal (vidian nerve), which consists of greater petrosal never and deep petrosal NAV

Front 15

Superior Orbital Fissure
(passageway)
7

Back 15

-Oculomotor nerve (CN III)
-Trochelar N (CNIV)
-opthalamic division of trigeminal nerve (V1)
-abducent nerbve (CNVI)
-postganglionic sympathetics
-superior opthalamic vein
-recuurent branch of lacrimal artery that anastomoses with opthalamic branch of middle meningeal artery

Front 16

Condylar canal
Passageway

Back 16

Emissary veins, meningeal branch of occipital artery
(passthru)

Front 17

Foramen Magnum
(passageway)

Back 17

Junction of the spinal cord and brainstem,
-vertebral arteries
-anterior and posterior spinal arteries
-spinal roots of CN IX
cummincation with venous plexuses around psinal cord with dural venous sinuses

Front 18

Hypoglossal Canal

Back 18

Hypoglossal nerve (XII) -meningeal branch (nerve)
-meningeal branch of ascending pharyngeal artery and emissary vein

Front 19

internal auditory meatus

Back 19

-Facial (VII)
-Vestibulocochlear nerve (VIII)
-labrynthine artery

Front 20

Jugular Foramen
(passageway)

Back 20

CN IX, X, XI
internal jugular vein formed by sigmoid sinus and inferior petrosal sinus.
-meningeal branches from occipital and ascending pharyngeal arteries
-meningeal branch of CN X

Front 21

Mastoid Canaliculus

Back 21

Auricular branch of vaus with contributions from CN IX and CII and the emissary vein

Front 22

Mastoid Foramen

Back 22

emissary vein, meningeal branch of occipital artery