Foramen, Fissures, Fossas (M1) Flashcards
Foramen
Pl: foramina
Hole or opening in bone. Allows entrance and exit of nerves and vessels in and out of the orbit
Name the foramina in the orbit
Optic foramen (canal)
Supraobbital foramen
Supratrochlear foramen
Infraorbital foramen
Fissure
Long, narrow opening in bone.
Allows entrance and exit of nerves and vessels in and out of the orbit
Name the fissures in the orbit
Superior orbital fissure
Inferior orbital fissure
Fossa
Shallow depression in bone
Name the fossa in the orbit
Lacrimal fossa (2)
Location of optic foramen (optic canal)
Between the lesser wing and body of the sphenoid.
At orbital apex (slightly nasal, posterior portion of the orbit).
opening between orbit and cranial cavity.
Location of common tendinous ring
anterior to optic foramen (optic canal).
anterior to inferior portion of the superior orbital fissure
What is the common tendinous ring
band of connective tissue.
divides superior and inferior orbital fissure.
origin for 4 of the EOMs
What passes through the optic canal and common tendinous ring
CN II and ophthalmic artery
Location of superior orbital fissure (supraorbital fissure)
Between greater and lesser wings of sphenoid.
Inferior portion at the orbital apex (slightly nasal, posterior portion of the orbit).
Opening between orbit and cranial cavity
what nerves pass through superior orbital fissure and common tendinous ring
superior and inferior division of oculomotor nerve (CN III).
nasociliary nerve (CN V1).
abducens nerve (CN V1).
what nerves and vessels pass through the superior orbital fissure and above the common tendinous ring
superior ophthalmic vein.
trochlear nerve (CN IV).
lacrimal nerve (CN V1).
frontal nerve (CN V1).
location of inferior orbital fissure (infraorbital fissure)
between floor of the orbit and lateral wall.
opening between orbit and cranial cavity
what nerves and vessels pass through inferior orbital fissure
inferior ophthalmic vein.
zygomatic nerve (CN V2).
infraorbital nerve (CN V2), artery, and vein (continue along infraorbital groove to pass through infraorbital canal and foramen)
location of lacrimal fossa for the lacrimal gland
in frontal bone temporally.
sits in the lacrimal fossa
location of lacrimal fossa for the lacrimal sac
located medially.
formed by the lacrimal bone and frontal process of the maxillary bone:
- posterior lacrimal crest: ridge in lacrimal bone.
- anterior lacrimal crest: ridge in maxillary bone.
what is the lacrimal sac
in the lacrimal fossa for the lacrimal sac
what separates the lacrimal fossa for the lacrimal sac from the orbit
orbital septum (sheet of dense connective tissue)
what canal in the maxillary bone extends from the lacrimal fossa to open into the nasal cavity
nasolacrimal canal (also contains nasolacrimal duct)
location of superior orbital (supraorbital) foramen/notch
above the orbit.
in frontal bone medially.
hole/notch in frontal bone.
- notch = broken foramen.
opening between orbit and facial surface
what passes through the supraorbital foramen/notch
supraorbital nerve (CN V1), artery, and vein
what passes through the supratrochlear foramen/notch
supratrochlear nerve (CN V1), artery, and vein
location of superior trochlear (supratrochlear) foramen/notch
above the orbit.
in frontal bone medial to supraorbital foramen.
hole/notch in frontal bone.
opening between orbit and facial surface
location of infraorbital foramen
below the orbit.
in maxillary bone.
opening between orbit and facial surface.
what passes through the infraorbital foramen
infraorbital nerve (CN V2), artery, and vein
