Osteology of Skull Flashcards
What bones surrund greater wingo fsphenoid bone (3)
Forntal, Parietal ,and Temproal bone
What forms the calvaria (4)
frotnal bne, pariatal bones, and the squamous parts of teh temporal and occipital bones
What are the bones of the cranium (6)
Frontal bone Paired parietal bones Paired temporal bones Single occipital bone Single sphenoid bone Single ethmoid bone
Posterior Articulation
Parietal bones via the Coronal Suture
Inferior Articulation (6)
Sphenoid Zygomatic Lacrimal Maxiallary Nasal Ethmoid bones
What runs through supraorbital Notch (foramen)
Supraorbital Nerve and Artery
What are superciliary ridges
brow ridges
What is the Zygomatic Process
for articulation with zygomatic bone
What is the coronal suture
From side to side across top of skull
Divides frontal bone from teh two parietal bones
What is the Lambdoid suture
where parietal bones meet occipital bone
What are superior and inferior temproal lines
continue posteriorly onto parietal bones- for attachemnt of
(superior) TEMPORALIS FASCIA and (inferior) Temporalis MUSCLE
What is the Pterion
“dont get hit in teh temple)
This is the thinnest part of the skull!
Translucent
Grooves for Meningeal vessesls
What are Grooves in Frontal bone for
on inside surface for meningeal vessels
Can be seen Pterion
What are Sinuses
part of paranasal sinus sytem- usually drain through ethmoid sinuses
How do parietal bones articulate medially
Via the Sagittal Suture
How do parietal bones articulate Anteriorly
With frontal bones via coronal suture
How doe Paritetal bones articualte posterioly
with occipital bone via Lambdoid suture
What do parietal bones articualte with inferiorly
Temporal bones
Foramen for Emissary Vein
near sagittal border
What are intrasutural bones
rare, called “inca bones” b/c prominent in Inca iIndieanns
Which bone contains the FORAMEN MAGNUM
Occipital Bone
What does Occipital bone articulate with anteriorally and laterally
Mastoid and petrous parts of temporal bones
What does Occipital bone articualte with Anterioly
Sphenoid bone at the midlein
What does Occipital bone articualte with infeirorly
Superior articular facets of the atlas vertebra via teh occipital condyles forming ATLANTOOCCIPITAL JOINTS
What three cranial nerves come out of jugular foramen
Vagus N
Glossopharyngeal N
Accessory N
What are the foramina from anterior to posterior on inferior skull
Open Some Canned Jugs Hun
Foramen Ovale Foramen Spinosum Carotid Canal Jugular Canal Hypoglaossal Canal
Which bone is the “yes” bone?
Atlas!!!
Its articulation with teh Occipital COndyle allows one to say yes
What is the No Bone
2nd Cervical Vertebrae
Atlas rotates on dens of 2nd vertical vertebrae (axis)
What is Diploe
Cancellous bone of the skull
Where CSF is circulated around brain and recycled trhough Arachnoid Granulations
What is the Sulcus for Superior Sagittal Sinus
Characteristic fo vein with endothelial-like structures
Formed by reflection of meninges that surrounds brain
Major stucture draining blood from brain
Brings blood from brain and Ends up draining into IJV –> Jugualr forament
WHat can be torn when you fracture the BASE OF THE SKULL
the Meninges! B/c DUra is very adherant to base of skull, allows CSF to escape to various places in skull
Commonly through ears and nasal cavities
What is the Sigmoid Sulcus
Big dura venous drainage structures for brain
Internal/External Connection
What do surgeons need to break through in order to get to Pituitary gland?
Hypophyseal Fossa
What doe sthe Anterior Cranial Fossae consist of
Frontal lobs of brain
Olfactory bulbs and trats
Cribiform foramina
What is in Middle Fossa
Butterfly
Temporal lobes fo brain Pituitary gland Foramina Rotundum Foramina Ovale Foramina Spinosum Superior Orbital Fissures Optic Canals
What is in the Posterior Cranial Fossa
Midbrain Pons Meduall of brain stem Cerebellum Foramen magnum Jugular foramen Internal Acoustic Meatus Hypoglossal Canal
Condylar Canal and Mastoid Foramen Des
Describe what kind of bone Fontalles
Ossified
Developing bones will slide on each other
Humans can barely amke it thorugh birth canal
Areas in calvaia of new born infants where sutures do not meet and there is a gap between teh bones closed with mabranous tissue has not yet ossififed
Bregma
Anterior Fontanelle
future site of Bregma
Lambda
Posterior Fontanelle, future site of lamba
