Head: Internal Skull Flashcards
1
Q
Anterior Cranial Fossa
A
- Frontal lobes sit here
2
Q
Anterior Cranial Fossa is formed by
A
- Frontal bone
- Ethmoid bone
- Sphenoid bone
3
Q
Orbital Plate of Frontal Bone
A
- Forms the roof of the orbit
4
Q
Ethmoid Bone structures
A
- Cribiform plate
- Crista galli
5
Q
Sphenoid Bone structures
A
- Body and lesser wings
- Anterior clinoid process
6
Q
Crista Galli
A
- Attachment of cranial dura mater (falx cerebri)
7
Q
Openings of the Anterior Cranial Fossa
A
- Foramina of cribriform plate
- Foramen cecum
8
Q
Foramina of Cribriform Plate
A
- Passage of bipolar neurons of olfactory nerve (CN I)
9
Q
Foramen Cecum
A
- Emissary vein from nasal cavity draining to cranial sinuses (not always present)
10
Q
Middle Cranial Fossa
A
- Temporal lobes of the brain are found here
11
Q
Middle Cranial Fossa formed by
A
- Temporal bone
- Sphenoid bone
- Sella turcica
12
Q
Posterior boundary of Middle Cranial Fossa
A
- Crest of the petrous ridge (temporal bone)
- Dorsum sellae
13
Q
Sella Turcica contains
A
- Tuberculum sellae
- Hypophyseal fossa: houses pituitary gland
- Dorsum sellae
- Posterior clinoid process: dural attachment
14
Q
Hypophyseal Fossa
A
- Houses pituitary gland
15
Q
Posterior Clinoid Process
A
- Dural attachment
16
Q
Openings in Middle Cranial Fossa
A
- Superior orbital fissure
- Foramen rotundum
- Foramen ovale
- Foramen spinosum
- opening for carotid canal
- Foramen lacerum
- Optic canal
- Groove for greater petrosal nerve
- Groove for lesser petrosal nerve
17
Q
Superior Orbital Fissure
A
- Communicates with orbit
18
Q
Foramen Rotundum
A
- Communicates with pterygopalatine fossa
19
Q
Foramen Ovale
A
- Communicates with infratemporal fossa
20
Q
Foramen Spinosum
A
- Communicates with infratemporal fossa
21
Q
Foramen Lacerum
A
- Typically closed by cartilage
- Small meningeal vessels pass through
- Internal carotid and some nerves pass horizontally across
22
Q
Optic Canal
A
- Communicates with orbit
23
Q
Posterior Cranial Fossa
A
- Deepest cranial fossa
- Houses the cerebellum, pons, and medulla
24
Q
Posterior Cranial Fossa Contains
A
- Dorsum sellae
- Crest of petrous ridge separate from middle cranial fossa
- Clivus
- Internal occipital protuberance
- Internal occipital crestgroove for transverse and sigmoid sinuses
25
Openings in Posterior Cranial Fossa
- Foramen magnum
- Hypoglossal canal
- Jugular foramen
- Internal acoustic meatus
