SKULL BONES Flashcards
Location of FRONTAL BONE
located at front of skull (“forehead”)
Features of FRONTAL BONE
- Frontal sinuses
- Coronal Suture
- Glabella
- Supraorbital Foramen
- Supercillary Arches
smooth surface between supraorbital ridges
glabella
opening on superior aspect of orbit that transmits supraorbital nerve/artery/vein
Supraorbital foramen
bony prominence on supraorbital margin
Superciliary Arches
Location of PARIETAL BONES
Lateral walls of skull
Features of PARIETAL BONES
- Sagittal Suture
- Lambdoid Suture
- Squamous Suture
Location of TEMPORAL BONES
lateral walls of skull, inferior to parietal bones
Features of TEMPORAL BONES
Internal Acoustic Meatus
External Acoustic Meatus
Petrous Region
Mastoid Process
Styloid Process
Zygomatic Process (+ Zygomatic Arch)
Stylomastoid Foramen
Location of OCCIPITAL BONE
posterior region of skull
Features of OCCIPITAL BONE
Foramen Magnum
External Occipital Protuberance
Occipital Condyles
Hypoglossal Canal
Jugular Foramen
Location of SPHENOID BONE
butterfly-shaped, located internally
Features of SPHENOID BONE
Sella Turcica
Sphenoid Sinus
Lesser Wings / Greater Wings
Pterygoid Processes (+ Medial and Lateral Pterygoid Plate)
Superior Orbital Fissures
Optic Canal
Foramen Spinosum
Foramen Rotundum
Foramen Lacerum
Location of ETHMOID BONE
Inferior to frontal bone/posterior to nasal bones/anterior to sphenoid bone
Features of ETHMOID BONE
Cribriform Foramina
Crista Galli
Ethmoid Air Cells (Sinuses)
Superior Nasal Conchae
Middle Nasal Conchae
Perpendicular Plate
T/F: The INFERIOR NASAL CONCHAE is part of the ETHMOID BONE
F - separate bones that do not articulate with ethmoid bone (only Superior nasal conchae are part of ethmoid)
4 Skull Sutures
Coronal, Sagittal, Squamous, Lambdoid
Coronal Suture
connects frontal and parietal bones
Sagittal Suture
connects parietal bones
Squamous Suture
connects temporal and parietal bones
Lambdoid Suture
connects occipital and parietal bones
8 Major FACIAL BONES
Mandible
Maxillae
Lacrimal Bones
Nasal Bones
Vomer
Inferior Nasal Conchae
Palatine Bones
Zygomatic Bones
Features of MANDIBLE
Mandibular Ramus = Condyloid and Coronoid Processes
MANDIBLE
lower jaw
Condyloid Process
- posterior projection from mandibular ramus
- articulates with mandibular fossa of temporal bone form TMJ
Coronoid Process
- anterior process from mandibular ramus
- attachment for temporalis muscle
MAXILLAE
upper jaw and hard palate
Features of MAXILLAE
Palatine Processes
Maxillary Sinuses
Inferior Orbital Fissure
Infraorbital Foramen
Palatine Processes
projection that form hard palate
Inferior Orbital Fissure
- large opening along inferior floor of orbit
- transmits branches of maxillary nerve/artery/vein
Infraorbital Foramen
- opening below orbit
- transmits infraorbital nerves/arteries/veins to face
Lacrimal Bones
- small, located in medial part of orbit
- form part of Nasolacrimal Duct (drains tears)
Nasal Bones
form bony bridge of nose (where glasses sit)
Nasal Bones
form bony bridge of nose (where glasses sit)
Vomer
forms part of nasal septum
Inferior Nasal Conchae
form part of lateral wall of nasal cavity
Palatine Bones
form posterior portion of hard palate and posterolateral walls of nasal cavity
Zygomatic Bones
form cheekbone of skull
What is the Nasal Septum formed from?
Vomer, Perpendicular Plate of Ethmoid bone, Nasal cartilage
hallow spaces within frontal bone
Frontal Sinuses
transmits nerves for hearing/balance/facial expression
Internal Acoustic Meatus
passageway for sound waves to reach tympanic membrane (eardrum)
External Acoustic Meatus
densest portion skull, houses cochlea (hearing) and vestibular apparatus (balance)
Petrous Region
opening between styloid and mastoid processes, transmits facial nerve
Stylomastoid Foramen
opening between styloid and mastoid processes, transmits facial nerve
Stylomastoid Foramen
large opening at base of skull
Foramen Magnum
articulates with C1 vertebra (atlas) to make atlanto-occipital joint
Occipital Condyles
located adjacent to occipital condyles, transmits hypoglossal nerve
Hypoglossal Canal
opening between occipital and temporal bones
Jugular Foramen
depression that houses pituitary gland
Sella Turcica
transmits optic nerve and ophthalmic artery
Optic Canal
transmits maxillary nerve
Foramen Rotundum
holes that transmit olfactory nerves from nasal cavity into olfactory bulb
Cribriform Foramina
