Flashcards in Skull and CN Deck (81)
What is the suture between frontal and Parietal bone?
Differences between male and female skulls? (8)
1. Males more prominant superciliary arch and ridge
2. Females rounder orbits vs square and Females Sharper orbit ridge
3. Females more pointed chin vs squarer
4. Males less round forehead
5. Males more vertical (right angle) gonial angle of mandible ramus, whereas females is slightly more gradually sloped.
6. Males the glabella (between frontal and nasal bones) is more pronouned and angular
7. Males have larger mastoid processes (temporal bone behind ear)
8. Males have larger external occipital protuberance and nuchal line.
What is the most delicate part of the skull? Why?
Where frontal bone, sphenoid greater wings, temporal and parietal articulate.
Can damage the middle meningeal artery causing an epidural haematoma
What is the smallest bone in the skull and where is it?
Lacriminal, medial of eye socket between ethmoid and maxilla (and nasal)
Where can the wings of the sphenoid bone be seen?
Lesser wings, in posterior of eye socket
Greater wings, lateral wall of skull, floor of middle cranial fossa.
What are the 3 foramen and one canal in the sphenoid bone? What do they transmit?
Foramen Ovale- Mandibular nerve of Trigeminal
Foramen Rotundam- Maxillary Nerve of trigemina;
Foramen Spinosum- Middle meningeal artery, vein and branch of Trigeminal
Optic Canal- optic nerve and Opthalamic artery
Difference between a foramen and canal?
Canal is a channel through whereas a foramen is just a hole.
Suture between the parietal and occipital bone?
What are the bones that make up the septum of the nose?
Perpendicular plate of the ethmoid bone and Vomer
Where can the ethmoid bone be seen?
Nasal septum- perpendicular plate, Inferior and middle concha in nose
Medial of orbit
Ethmoid bone structures in the Anterior cranial fossa?
Cribiform plate, with holes in for the olfactory nerve fibres to pass through
Crista galli- the line running between the cribiform plate.
What is the frontal crest?
Runs from the Crista galli to the frontal bone.
Attatchment point for the falx cerebri
What does the anterior cranial fossa hold?
Anterior inferior frontal lobes
What are the three 'saddle' structures of the body of sphenoid?
Anterior to posterior:
Hypophysial fossa (with sella turcica- depression holding the pituitary)
What is the large hole in the posterior cranial fossa called? What does it transmit through?
What foramen forms between the occipital bone and the petrous part of the temporal?
Jugular foramen, transmits the jugular vein, and cranial nerves glossopharyngeal IX, vagus X and accessory XI
How is the cerebellum separated from the occipital lobe of the brain?
Cerebelli tentorium is an extension of the dura mater that overs the superior of the cerebellum, splitting the cranial cavity into supratentorial and infratentorial
What are the three meninges?
Superficial to deep:
Function of the meninges?
Support and protect (with CSF) from mechanical damage
Two layers of the dura mater?
Endosteal and meningeal , with dural venous sinuses between.
Function of the dural venous sinuses?
Drain blood into the internal jugular veins
Dura mater supplied by? Different to arachnoid?
MIddle meningeal artery and vein
Arachnoid recieves none
How is the CSF recycled?
Through arachnoid granules (projections of arachnoid into the dura) to superior sagittal sinus to venous circulation
What is meningitis?
Inflammation of the meninges
Foramen in the frontal bone? Transmit?
Supraorbital foramen (or notch if opens into orbit)- supraorbital vessels and nerve through
Foramen in the zygomatic bone? Transmit?
Zygomaticofacial foramen- Zygomaticofacial branch of maxillary Trigeminal nerve and zygomaticofacial vessels
Foramen in the Maxilla? Transmit?
Infraorbital foramen- infraorbital vessels, and infraorbital branch of maxillary trigeminal nerve
Foramen in the mandible? Transmits?
Mental foramen- mental artery, inferior alveolar nerve
Suture between temporal and parietal bones?