Skull Flashcards
(32 cards)
The roof of the craniaum is called the
The calvaria
What makes up the floor of the cranium?
Cranial Base
What bones make up the calvaria?
The frontal bone
Parietal bones
and occipital bone
What are the three cranial fossa’s?
Anterior cranial fossa
Middle Cranial Fossa
Posterior Cranial Fossa
Lesser wings sphenoid - forms posterior limit of the ______ ; ending medially as the anterior clinoid processes.
Attachments for the anterior extent of the tentorium
cerebelli and the diaphragma sella
Anterior cranial fossa
the anterior aspect of the ______ joins the two lesser wings centrally
body of the sphenoid
jugum
What is found in Foramen cecum
Nasal emissary vein
What is found in Olfactory foramina of
cribriform plate
Axons of bipolar olfactory cells that form Olfactory N.
What is found in Anterior and posterior ethmoid foramina
Anterior and posterior
ethmoid nerve, A, & V
This fossa is located posteriorly and inferiorly to the
anterior cranial fossa, and extends from the lesser
wings of the sphenoid to the highest part of the
petrous part of the temporal bone
Middle Cranial Fossa
The fossa is formed by:
1. A very small portion of the lesser wing of the
sphenoid bone (optic canal);
2. The greater wing of the sphenoid;
3. The body of the sphenoid bone;
4. The petrous part of the temporal bone;
5. The squamous part of the temporal bone.
Middle Cranial Fossa
Within the Lesser wing of the Sphenoid • Transmits the Optic N II (some fibers cross in the Optic chiasma) and the Ophthalmic A. which is a branch of the Internal Carotid A.
Optic Canal
Between lesser and greater wings of sphenoid • Communicates with the orbit • Transmits ophthalmic veins and nerves (CN III, CN IV, CN V1, CN VI and sympathetic fibers)
Superior Orbital Fissure
• Transmits maxillary Division(CN V2) • Supplies skin, teeth and mucosa related to maxilla (lining the upper jaw and maxillary sinus
Foramen Rotundum
• Transmits Middle Meningeal
Artery (forms groove)
• And Meningeal Nerve (V3)
Foramen Spinosum
• Transmits Mandibular Division, (CN V3) • And Accessory meningeal Artery • Lesser Petrosal N. (branch from IX)
Foramen Ovale
• Closed by cartilage plate in life • Only some meningeal arteries and small veins pass through • Internal carotid artery and accompanying sympathetic and venous plexuses pass across the superior aspect of cartilage
Foramen Lacerum
- located on the
anterior surface of the petrous part of the temporal bone is a
small linear groove that passes in a superolateral direction
(branch of CN VII)
Groove for the greater petrosal nerve
located medially, as a slight
depression in the anterior surface of the petrous part of the
temporal bone, formed by Trigeminal Ganglion
Trigeminal impression
located anterior to the
greater petrosal groove, branch of CNIX, going towards ovale
Groove for the lesser petrosal nerve
near the superior ridge of the petrous part
of the temporal bone is a rounded protrusion produced by the
underlying anterior semicircular canal of the inner ear
Arcuate Eminence
Marked incline from dorsum sellae
Sphenoid bone continues into occipit
Clivus
Formed in relationship with confluence of the
sinuses
Internal occipital protuberance
What are the five foramina of the posterior fossa?
– Foramen Magnum – Internal Acoustic (Auditory) Meatus – Jugular Foramen – Hypoglossal Canal – Condyloid canal
