Skull and Cranial Cavity Flashcards
Nasion is formed by fusion of which three bones?
Two nasal and one frontal bone
Pterion is formed by fusion of which four bones?
Temporal, Frontal, Parietal and Sphenoid
Asterion is formed by junction of which three bones?
Occipital, Parietal and Tempooral
Which artery runs beneath Pterion?
Anterior division of middle meningeal artery
Coronoid process of the mandible is the point of attachement for which muscle?
Temporalis Muscle
What is the most prominent point of external occipital protruberance called?
Inion
where is mastoid notch located and what muscle attaches to it?
Inferomedial border of mastoid process, and posterior belly of digastric attaches here
What is the junction of coronal and sagittal suture called?
Bregma
What is the junction of sagittal and lambdoid suture called?
Lamda
What two bones form the hard palate?
Maxilla (palatine process) and Palatine bone (horizontal plate)
Sutures in between the two palatine process of the maxilla is called?
Intermaxillary suture
Suture between the maxillae and palatine bones is called?
palatomaxillary suture
Suture between the palatine bones in the midline is called?
Interpalatine Suture
What three foramina are there in the anterior part of the skull base, in inferior view?
Incisive Foramen
Greater palatine foramen
Lesser palatine foramen
Pterygoid processes are part of which bone and located where?
Sphenoid, and immediately lateral to each choana
What three bones form foramen lacerum?
Sphenoid, Occipital and Temporal
What bone are foramen ovale and spinosum part of?
Sphenoid (greater wing)
Carotid canal is in which bone?
Temporal
What bone are the condylar and hypoglossal canal in?
Occipital
What two bones form the jugular foramen?
Occipital and temporal
Where is the stylomastoid foramen located?
in temporal bone, between, mastoid process and styloid process.
What do the granular foveolae on the inside of the skull mark?
location of arachnoid granulations
What attaches on the frontal crest?
falx cerebri
What bones form the anterior cranial fossa?
Frontal, ethmoid, sphenoid
Where is the foramen cecum and what passes through it?
Between frontal and ethmoid bones, and emissary veins pass through it to nasal cavity, connecting it with superior sagittal sinus
What passes through cribriform foramina of ethmoid bone?
Olfactory nerves from nasal mucosa to olfactory bulb
How many total foramina are there in anterior cranial fossa?
- Foramen cecum, and cribriform foramina
What is the boundary between the anterior and middle cranial fossa?
Anterior edge of chiasmatic sulcus, between the optic canals across the body of sphenoid
What attaches on anterior clinoid process?
Tentorium cerebelli
What bones does the middle cranial fossa consist of?
Sphenoid, and temporal
What is the posterior boundary of middle cranial fossa?
Anterior surface of the petrous part of the temporal bone
What are the anterior and posterior walls of sella turcica called?
anterior: tuberculum sellae
posterior: dorsum sellae
Where’s the superior orbital fissure located and what passes through it?
between the lesser and greater wings of sphenoid, CN 3,4, 5(i), 6, and superior ophthalmic veins pass through it
What passes through foramen rotundum and to where?
Maxillary nerve of trigeminal, it goes to pterygopalatine fossa
What passes through optic canal?
optic nerve and ophthalmic artery
What passes through foramen ovale?
Mandibular nerve, lesser petrosal nerve and accessory middle meningeal artery, it goes to infratemporal fossa
What passes through foramen spinosum and to where?
Middle meningeal artery and veins, and to infratemporal fossa
What passes through carotid canal and from where?
internal carotid artery from neck
what passes through foramen lacerum?
nothing, it’s filled with cartilaginous plug
Greater petrosal nerve is a branch of which cranial nerve?
Facial nerve
Lesser petrosal nerve is a branch of which nerve?
Glossopharyngeal nerve
What bones form the posterior cranial fossa?
occipital and temporal
What passes through foramen magnum?
brainstem, spinal cord, vertebral arteries, nerve plexuses, anterior and posterior spinal artery, meninges, spinal roots of accessory nerve.
What passes through internal acoustic meatus and where?
CN 7, CN 8, and labyrinthine artery and vein, through styloid foramen, to ear and neck
What passes through jugular foramen?
CN 9, 10, 11, internal jugular vein, into which sigmoid and petrosal sinus drain
What passes through hypoglossal canal?
hypoglossal nerve and miningeal branch of ascending pharyngeal artery
What passes through the condylar canal?
emissary vein
How many foramina in posterior cranial fossa? and name them
5 internal acoustic meatus hypoglossal canal jugular foramen foramen magnum condylar foramen
