Cranial Cavity Flashcards
Cranial Fossae
- Anterior
- Middle
- Posterior
Anterior Cranial Fossa (Bones, Landmarks)
-
Bones
- Frontal
- Ethmoid
- Sphenoid
-
Landmarks
- Falx Cerebri attaches to frontal crest and crista galli
- Tentorium Cerebelli attaches to anterior clinoid process
Foramina of Anterior Cranial Fossa and what structures pass through them
- Foramen Cecum - Emissary vein between superior sagittal sinus and nasal cavity
- Cribiform Palate - Olfactory Nerves (I)
- Optic Canal - Optic nerves (II) and Opthalmic arteries
Middle Cranial Fossa
-
Bones
- Temporal
- Sphenoid
-
Organ
- Temporal Lobe of brain
-
Landmarks
- Sella turcica in hypophoseal fossa containing pituitary gland
Foramina of Middle Cranial Fossa and what structures pass through them
- Superior Orbital Fissure: III, IV, V1, VI, opthalmic veins
- Foramen rotundum: V2 (maxillary of trigeminal)
- Foramen Ovale: V3 (Mandibular of trigeminal)
- Foramen Spinosum: Middle meningeal artery
- Hiatus for greater petrosal nerve: Greater petrosal nerve (branch of VII)
- Hiatus for lesser petrosal nerve: Lesser petrosal nerve (branch of IX)
Carotid Canal vs. Foramen Lacerum
-
Foramen Lacerum
- Nothing transmitted through
- plugged in real life by cartilage
-
Carotid Canal
- passage of internal carotid artery
Pituitary Gland (Hypophysis)
- SIts in sella turcica in hypophoseal fossa
- Infundibulum = stalk of pituitary
Posterior Cranial Fossa
- Bones
- Occipital
- Temporal
- Organ
- Cereballum
- Brain stem
- Occipital Lobe
Foramina of Posterior Cranial Fossa and what passes through them
- Foramen Magnum - Brainstem/spinal cord, vertebral arteries, XI
- Internal acoustic meatus - VII, VIII, labyrinthine artery
- Jugular Foramen - IX, X, XI, inferior petrosal sinus, sigmoid sinus (turns into IJV)
- Hypoglossal canal - XII
Cranial Nerves in Cranial Fossa
Dural venous sinuses: What they do, what they accept, where they are, and where they go
- Function: Venous drainage of Brain
- Accept: Veins from Cerebrum, cerebellum, brainstem
- Location: between periosteal and meningeal layers of dura mater
- Destination: IJV
How is the Cranium Drained?
-
Diploic Veins - run between internal and external tables of compact bone
- Empty into dural venous sinouses
-
Emissary Veins - travel from inside cranial cavity to outside
- no valves
- spread of infection
Dural Venous Sinuses Picture
Dural Venous Sinus picture - Superior view
Flow of blood through dural venous sinuses to IJV
What does superior saggital sinus also recieve ?
CSF
What does Straight Sinus also recieve
Great Cerebral Vein
Contents of Cavernous Sinus
- III
- IV
- V1
- V2
- VI
- Internal carotid artery
