Foramen, Fissures, Fossas (M1)

Question 1

Foramen

Answer 1

Pl: foramina
Hole or opening in bone. Allows entrance and exit of nerves and vessels in and out of the orbit

Question 2

Name the foramina in the orbit

Answer 2

Optic foramen (canal)
Supraobbital foramen
Supratrochlear foramen
Infraorbital foramen

Question 3

Fissure

Answer 3

Long, narrow opening in bone.
Allows entrance and exit of nerves and vessels in and out of the orbit

Question 4

Name the fissures in the orbit

Answer 4

Superior orbital fissure
Inferior orbital fissure

Question 5

Fossa

Answer 5

Shallow depression in bone

Question 6

Name the fossa in the orbit

Answer 6

Lacrimal fossa (2)

Question 7

Location of optic foramen (optic canal)

Answer 7

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.

Question 8

Location of common tendinous ring

Answer 8

anterior to optic foramen (optic canal).
anterior to inferior portion of the superior orbital fissure

Question 9

What is the common tendinous ring

Answer 9

band of connective tissue.
divides superior and inferior orbital fissure.
origin for 4 of the EOMs

Question 10

What passes through the optic canal and common tendinous ring

Answer 10

CN II and ophthalmic artery

Question 11

Location of superior orbital fissure (supraorbital fissure)

Answer 11

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

Question 12

what nerves pass through superior orbital fissure and common tendinous ring

Answer 12

superior and inferior division of oculomotor nerve (CN III).
nasociliary nerve (CN V1).
abducens nerve (CN V1).

Question 13

what nerves and vessels pass through the superior orbital fissure and above the common tendinous ring

Answer 13

superior ophthalmic vein.
trochlear nerve (CN IV).
lacrimal nerve (CN V1).
frontal nerve (CN V1).

Question 14

location of inferior orbital fissure (infraorbital fissure)

Answer 14

between floor of the orbit and lateral wall.
opening between orbit and cranial cavity

Question 15

what nerves and vessels pass through inferior orbital fissure

Answer 15

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)

Question 16

location of lacrimal fossa for the lacrimal gland

Answer 16

in frontal bone temporally.
sits in the lacrimal fossa

Question 17

location of lacrimal fossa for the lacrimal sac

Answer 17

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.

Question 18

what is the lacrimal sac

Answer 18

in the lacrimal fossa for the lacrimal sac

Question 19

what separates the lacrimal fossa for the lacrimal sac from the orbit

Answer 19

orbital septum (sheet of dense connective tissue)

Question 20

what canal in the maxillary bone extends from the lacrimal fossa to open into the nasal cavity

Answer 20

nasolacrimal canal (also contains nasolacrimal duct)

Question 21

location of superior orbital (supraorbital) foramen/notch

Answer 21

above the orbit.
in frontal bone medially.
hole/notch in frontal bone.
- notch = broken foramen.
opening between orbit and facial surface

Question 22

what passes through the supraorbital foramen/notch

Answer 22

supraorbital nerve (CN V1), artery, and vein

Question 23

what passes through the supratrochlear foramen/notch

Answer 23

supratrochlear nerve (CN V1), artery, and vein

Question 24

location of superior trochlear (supratrochlear) foramen/notch

Answer 24

above the orbit.
in frontal bone medial to supraorbital foramen.
hole/notch in frontal bone.
opening between orbit and facial surface

Question 25

location of infraorbital foramen

Answer 25

below the orbit.
in maxillary bone.
opening between orbit and facial surface.

Question 26

what passes through the infraorbital foramen

Answer 26

infraorbital nerve (CN V2), artery, and vein