1 skull, Tm joint Flashcards
what are the two components of the neurocranium
calvaria and cranial base
what is the viscerocranium
anterior part of the cranium
what bones contribute to the orbital margin
frontal
zygomatic
maxilla
what are the 3 foramen for the divisions of cranial nerve 5
supra orbital, infra orbital, mental
what bones form the calvaria
2 x parietal
frontal
occipital
what is the anterior meeting point of the frontal and parietal bones called
bregma, intersection of the coronal suture line and sagittal suture line
what is the name for where the parietal bone meet the occipital bone
lambda
along the lambdoid suture line
what bone is the mastoid a part of
temporal
how many fontanelles do babies have
2
when does the frontal fontanelle disappear by
18 months
what type of joint is found between bones of the calvaria
fibrous sutures
what bones form the anterior cranial fossa
frontal
ethmoid
lesser wings of sphenoid bone
what bone is the crista gali and cribriform plate found in
ethmoid
what does clinoid process mean
bed post
where is the pituritary gland found
hypophysial fossa
what is the dorsum sellae
back of saddle
what is the name for the front of the sadle
tuburculum sellae
turkish saddle
sella turcica
what bones makes up the nasal septum
vomer
what lines can be seen on the lateral aspect of the cranium
superior and inferior temporal lines
what is the temporal fossa
found on the lateral aspect of the cranium
bounded by the superior temporal line, frontal process of zygomatic bone, zygomatic process of frontal bone, infratemporal crest, pterion
what forms the floor of the temporal fossa
pterion
what part of the spenoid bone is seen on the lateral cranium
greater wing
why can fracture of the pterion be life threatening
thin bones
overlie the middle meningeal artery
haematoma exerts pressure on the cerebral cortex
where is the sphenoidal sinus
just below the pituitary gland, at the back of the nasal cavity
describe the TMJ
condylar process articulates with the temporal bone within the mandibular fossa at the TMJ
superior and inferior articular cavities separated by the articular disc, attached to the internal aspect of the joint capsule
what type of joint is the TMJ
modified synovial
what ligament is the primary passive support of the mandible
spenomandibular
what is the intrinsic ligament
thickened part of capsule
lateral ligament strengthens the joint laterally
what structures prevent posterior disclocation
postglenoid tubercle
lateral ligament
what are the two extrinsic ligament of the TMJ
sphenomandibular
stylomandibular
what movements occur in the superior cavity
gliding
what movements occur in the inferior cavity
hinge and rotational
what are the boundaries of the infratemporal fossa
• Lateral: Ramus of mandible • Medial: Lateral pterygoid plate • Anterior: posterior aspect maxilla • Posterior: Tympanic plate/mastoid and styloid process • Superior: Infratemporal crest of sphenoid • Inferior: Angle of mandible.
what are the boundaries of the pterygopalatine fossa
• Superior: apex of orbit • Posterior: Lateral Pterygoid plate • Anterior: posterior aspect of maxilla • Medial: perpendicular plate of palatine bone • Lateral: infratemporal fossa • Incomplete roof: infratemporal surface of greater wing of sphenoid • Floor: pyramidal process of palatine bone
why is the TMJ an atypical synovial joint
it is not made of hyaline cartilage its made of fibrocartilage it contains an intraarticular disk
