Cranial Fossa

Front 1

What are the trhee depressions which make up the base of th einterior of the cranial cavity?

Back 1

Anterior, middle and posterior cranial fossae

Front 2

What three bones form the shallowest of the cranial fossae?

Back 2

Frontal bone
Ethmoid bone
Sphenoid bone

Front 3

What part of the frontal bone supports the frontal lobes of the brain?

Back 3

The orbital plates

Front 4

What is the midline protrusiono fht efrontal bone and projects into the left an dright cerbral hemispheres?

Back 4

The frontal crest

Front 5

What serves as the attachment point for the falx cerebri?

Back 5

The frontal crest

Front 6

What transmits through the foramen cecum?

Back 6

An emissary vein

Front 7

What is located at the base of the frontal crest?

Back 7

The forament cecum

Front 8

What is a sharp ridge of bone in the midline, psoterior to the frontal crest and formane ceum?

Back 8

Crista galli

Front 9

In addition to the attachment at the frontal crest where else does the falx cerebri attach?

Back 9

crista galli

Front 10

What gyrus lies laterally to the crista galli?

Back 10

The gyrus rectus

Front 11

What is a thin lamina of bone located on each side of th cresta galli?

Back 11

Cribiform plate

Front 12

What lies on the cribriform plate on each side.

Back 12

Olfactory bulb

Front 13

Where are the anterior and posterior ethmoidal foramina located?

Back 13

At the jucntion of the cribriform plate and the orbital plate of the frontal bone.

Front 14

What transmits through the anterior and posterior ethmoidal foramina?

Back 14

The anterior and posterior ehtmoidal nerves and vessels from the orbit to the anterior cranial fossa

Front 15

What is located medially, posterior to the cribriform plat and is the most anterior part of the boyd of the sphenoid bone.

Back 15

Jugum (Yoke of sphenoid)

Front 16

What extend laterally from the jugum?

Back 16

Extend laterally from the jugum

Front 17

What part of brain is supported for by the lesser wings?

Back 17

Posterior border of each lesser wing.

Front 18

Where does the lesser wing project into?

Back 18

Lateral sulcus of the cerebral hemisphere.

Front 19

What serves as the attachment for the free border ofthe tentorium cerebeli?

Back 19

Anterior Clinoid processes

Front 20

What are the two components of the cetnral part of the middle cranial fossa?

Back 20

The chiasmatic sulcus and sella turcica

Front 21

What forms the median elevation forming the posterior border of the chiasmatic sulcus?

Back 21

Tuberculum sellae

Front 22

What is the name of the depresion that houses the pitutary gland and is covered diaphrgma sellae?

Back 22

Hypophysial fossa

Front 23

What is the square plate o fbone projecting superiorly from the body fo the sphenoid?

Back 23

Dorsum sellae

Front 24

What provides the attacdhmen for the fixed border of the tentorium cerebeli?

Back 24

Posterior clinoid process

Front 25

What supports the temporal lobes of the cerebral hemispheres?

Back 25

The lateral part of the middle cranial fossa

Front 26

What three components form the lateral part of the middle cranial fossa (ant to post)?

Back 26

Greater wign fo the sphenoid bone
Squamous temporal bone
Anterior face of the petrous temporal bone

Front 27

What foramen is located between the two roots of the leser wing of the sphenoid and the boyd of the sphenoid?

Back 27

Optic canal

Front 28

What foramen is a large horizontal opening lcoated between the greater and lesser wings of the sphenoid?

Back 28

Superior Orbital fissure

Front 29

What structures transmit through the optic canal?

Back 29

The optic nerve (CN II) and the ophthalmic artery (from the carotid)

Front 30

What structures transmit through the superior orbital fissure?

Back 30

CN III (Oculomotor)
CN IV (Trochlear)
Ophtahlmic nerve (CN V 1)
CN VI (Abducens)
Ophthalmic veins

Front 31

What foramen is located in the greater wing of the sphenoid bone, posterior to the medial end of the superior orbital fissure?

Back 31

Foramen Rotundum

Front 32

What structure transmits through the foramen rotundum?

Back 32

The maxillary nerve (CN V 2)

Front 33

What foramen is located in the greater wing of the sphenoid bone, posterolateral to the foramen rotundum?

Back 33

Foramen ovale

Front 34

What structre transmits through the foramen ovale?

Back 34

The Mandibular nerve (CN V3)

Front 35

What foramen is located in the greater wing of the sphonoid bone, postero lateral to the foramen ovale?

Back 35

Foramen spinosum

Front 36

What structures transmit through the foramen spinosum?

Back 36

The middle meningela artery (greatest contributor to dura)
Mengingeal branch of V 3

Front 37

AFter Forament Spinosum Describe the course of the middle meningeal artery?

Back 37

After transmission, it courses in a groove on the floor and lateral wall of the middle cranial fossa.

Front 38

What foramen is located between the petrous temporal bone and the sphenoid bone and is closed by a cartilaginous plate in life.

Back 38

Foramen Lacerum

Front 39

What passes over the superior aspect of the cartilage in route ot the cavernous sinus?

Back 39

The Internal carotid artery (ICA)

Front 40

Describe the relationship between the greater and lesser petrosal nerves and the foramen lacerum.

Back 40

Posterolaterally along the anterior face of the petrous temporal bone

Front 41

Where is the trigeminal impression located?

Back 41

Posterior to the foramen lacerum on the anterio surface of the petrous temporal bone (near the apex)

Front 42

Where does the end of the carotid canal open into?

Back 42

The middle cranial fossa at the apex of the petrous temporal bone

Front 43

What is housed in the trigeminal impresssion?

Back 43

The trigeminal (semilunar) ganglion

Front 44

What are the four parts of the ICA?

Back 44

1st part: The Cervical part
2nd part: Petrous part
3rd part: Cavernous or Sigmoid part
4th part: Supraclinoid part

Front 45

What is the largest and deepest of the cranial fossae?

Back 45

The posterior cranial fossa

Front 46

What are the components of the posterior cranial fossa?

Back 46

The occipital bone
parts of the temporal bone
the posterior surface of the dorsum sellae of the sphenoid bone

Front 47

What is a long flat slope of b one located anterior to the foramen magnum and is formed by the basilar portion of the occipital bone

Back 47

Clivus

Front 48

What supports the brainstem?

Back 48

The clivus

Front 49

What is a longitudinal ridge on the occipital bone; located posterior to the foramen magnum in the midline?

Back 49

Internal occipital crest

Front 50

What provides bony attachement for the falx cerebelli

Back 50

Internal occipital crest

Front 51

Where does the internal occipital crest end posteriorly?

Back 51

Internal occipital protuberance where the confluence of the sinuses are located.

Front 52

What is a pair of depressions in the occipital bone, posterior and lateral ot the foramen magnum?

Back 52

Cerebellar fossae

Front 53

What fossae makes up most of the floor of the posterior fossa?

Back 53

Cerebellar fossae

Front 54

What fossa (not posterior) houses the left and right cerebellar hemispheres?

Back 54

Cerebellar fossae

Front 55

What forms the anterolateral wall of the posterior cranial fossa?

Back 55

Posterior surface of the petrous temporal bone
Mastoid part of the temporal bone

Front 56

What structures transmit via the foramen magnum?

Back 56

Brain stem
Spinal accessory nerve (CN XI)
Vertebral arteries

Front 57

What structures transmit via the internal acoustic meatus?

Back 57

CN VII (Facial)
CN VIII (Vestibulocochlear)

Front 58

What foramen is located between the base of the petrous temporal bone and the occipital bone?

Back 58

Jugular foramen

Front 59

What structures transmit via the jugular foramen?

Back 59

CN IX (Glossopharyngeal)
CN X (Vagus)
CN XI (Spinal accessory)
Inferior petrosal sinus
Jugular Bulb

Front 60

What canal is located in the occipital bone, just above the anterolateral margin of the foramen magnum?

Back 60

Hypoglossal canal