The Skull Flashcards
Paired facial bones (6)
Zygomatic bones Lacrimal bones Nasal bones Palatine bones Maxillae Inferior nasal conchae
Unpaired facial bones (2)
Vomer
Mandible
How is the cranial cavity accessed in surgery?
Why this method?
Bone flap.
Periosteum has poor osteogenic properties, so it is plated/wired often. Healing is best when a flay of overlying tissues are maintained.
Coronal suture separates:
Frontal and both parietal bones
Sagittal suture separates:
Both parietal bones
Lambdoid suture separates:
Parietal and occipital bones
Squamous suture separates:
Temporal and parietal bones
Features of temporal bones (7)
External auditory meatus Internal auditory meatus Mastoid process Styloid process Mandibular fossa Zygomatic process Groove for sigmoid sinus
Features of internal occipital bone (5)
Hypoglossal canal Jugular notch Groove for sigmoid sinus Groove for transverse sinus Groove for superior sagittal sinus
Foramina of the sphenoid bone (3)
Foramen rotundum
Foramen ovale
Foramen spinosum
What exits the foramen spinosum?
Middle meningeal a.
Superior orbital fissure is within which bone?
Sphenoid bone
Pterygoid plates (medial and lateral) are on which bone?
Sphenoid bone
What attaches to the crista galli?
Falx cerebri
What makes up the superior part of the ethmoid bone?
Ethmoid air sinuses
Cribiform plate
Cribiform foramina (passageway for CN I)
Where does the lacrimal bone sit within the orbit?
Medial side
Which bones for the bridge of the nose?
Nasal bones
What passes thru the lacrimal groove?
Nasolacrimal duct
Inferior part of nasal septum is formed by which bone?
Vomer
Features of maxillae (6)
Palatine process (part of posterior part of hard palate) Incisive foramen Alveolar process Maxillary sinus Infraorbital foramen Zygomatic process
What does the incisive foramen separate?
Hard palate from anterior nasal spine
What does the alveolar process do?
Hold the teeth of the upper jaw
What is the largest paranasal sinus in the skull?
Maxillary sinus
LeFort fx I
LeFort fx II
LeFort fx III
LeFort fx I: only maxilla is fx
LeFort fx II: pyramidal fx
LeFort fx III: all facial bones are detached
Which bones make up the orbital complex? (7)
Frontal bone Greater and Lesser wings of sphenoid bone Lacrimal bone Ethmoid bone Perpendicular plate of palatine bone Orbital surface of maxilla Zygomatic bone
Roof of orbit is from (2):
Lesser wing of sphenoid bone
Frontal bone
Medial wall of orbit is from (3):
Frontal process of maxilla
Lacrimal bone
Lateral mass of ethmoid bone
Floor of orbit is from (3):
Perpendicular plate of palatine bone
Orbital surface of maxilla
Zygomatic bone
Lateral wall of orbit is from (3):
Zygomatic process of frontal bone
Greater wing of sphenoid bone
Orbital surface of zygomatic bone
Paranasal sinuses (4)
Frontal
Sphenoid
Ethmoid
Maxillary
Fontanelle of the fetal skull (4)
Anterior fontanelle (frontal and parietal) Sphenoid fontanelle (frontal, parietal, temporal and sphenoid) Mastoid fontanelle (parietal, temporal, occipital) Posterior fontanelle (occipital, parietal, temporal)
Which bone unites the cranial and facial bones AND articulates with almost every bone in the skull?
Sphenoid bone
