Topic 3A - OS TEMPORALE + OS PARIETALE Flashcards
What does the os temporale form?
the lateral part of the neurocranium
what does the os parietale form?
the dorsal part of the neurocranium
What are the 3 parts of the os temporale?
pars squamosa pars petrosa (caudoventral part) pars tympanica (base)
What separates the os temporal from the os occipital in Eq and Ru?
Fissura petroccipitalis
In which species is the os temporale joined to the os occipital and with what?
Ca, by the sutura occipitotympanica
List the facies of pars squamosa?
facies cerebralis and facies temporalis (outside)
What does facies cerebralis present?
sulci arteriosi et venosi
impressiones digitatae
juga cerebrallis
crista tentorica (small Ru)
What does the facies temporalis of pars squamosa os temporale present?
proc. Zygomaticus tuberculum articulare fossa mandibularis proc. retroarticularis foramen retroarticulare proc. occipitalis proc. retrotympanica meatus temporalis fossa temporalis crista temporalis
What species does not have tuberculum articulare?
Ca
Which structure forms the mandibular joint?
tuberculum articulare
What does pars petrosa enclose?
inner ear
What perforated the medial surface of pars petrosa?
porus acusticus internus
What are the 3 areas of the porus acusticus internus?
area n. facialis
area cochlear
area vestibularis dorsalis + ventralis
What does area cochlear act as a passage for?
the cochlear branches of N. Vestibulocochlearis (cranial nerve VIII)
What does area vestibularis dorsalis and ventralis act as a passage for?
the vestibular branches of N. Vestibulocochlearis (cranial nerve VIII)
What does the ventral surface of the pars petrosa present?
promontorium
fenestra vestibuli (ovale)
fenestra cochlea (rotundum)
crista partis petrosae
What species is crista partis petrosae present in and what does it do?
Ca and Eq
it separates the rost + med surfaces of pars petrosa
What are the structures of pars petrosa?
porus acusticus internus
proc. mastoideus
proc. styloideus
canalis facialis
what species is proc. mastoideus not present in?
Su
Describe the proc. mastoideus in the relevant species?
Bo - low ridge
Eq - tuberosity
Small Ru - roughened area
what species is proc. styloideus present in and what is its function?
Ru and Eq
attachment of hyoid
where does the canalis facialis end?
foramen stylomastiodeum ( n.facialis VII )
describe the canalis facialis in Ca?
it is between proc. mastoideus and tympanica
describe the canalis facialis in Eq and Ru?
it is between proc. mastoideus and proc. styloideus
what are the structures of pars tympanica?
bulla tympanica meatus acusticus externa vagina proc. styloidei proc. muscularis fissura petrotympanica pars ossea tubae auditivae canalis musculotubarius
where does the meatus acusticus externa open?
porus acusticus externus
what species is the vagina proc. styloidei present in?
Eq and Bo
describe the proc. muscularis in the relevant species
it projects rostoventrally from bulla
ca + su - short thorn
eq - long rod
bo - broad base
what species is the septum bullae present in?
ca
the pars ossea tubae auditivae is a connection between?
cavum tympani and pharynx
canalis musculotubarius consists of?
semicanalis tubae auditivae
semicanalis m. tensor tympanii
septum canalis musculotubarii
what is the external surface of os parietale made up of?
planum temporale (lateral sides) planum parietale (dorsal)
what is the name of the planum parietale in Ru?
planum nuchae
what are the structures of os parietale?
planum temporale and parietale (nuchae in Ru) linea temporalis crista sagittalis externa crista sagittalis interna proc. tentoricus tentorium cerebelli osseum
in what species is the crista sagittalis externa present in?
eq and ca
in what species is the crista sagittalis interna present in?
bo and su
the tentorium cerebelli osseum is formed from?
proc. tentoricus of os parietale, interparietale and occipitale
what species is the proc. tentoricus in?
eq and ca
what are the structures of the os interparietale ?
linea temporalis crista sagittalis externa proc. tentoricus eminentia cruciformis canalis sinus transversii
what is the os interparietale?
paired bones fused by sutura sagittalis
where is the os interparietale located?
in the median plane between os parietale and os occipital
what species is the eminentia cruciformis present in?
Ru instead of osseus tentorium
