Topic 3A - OS TEMPORALE + OS PARIETALE

Question 1

What does the os temporale form?

Answer 1

the lateral part of the neurocranium

Question 2

what does the os parietale form?

Answer 2

the dorsal part of the neurocranium

Question 3

What are the 3 parts of the os temporale?

Answer 3

pars squamosa
pars petrosa (caudoventral part)
pars tympanica (base)

Question 4

What separates the os temporal from the os occipital in Eq and Ru?

Answer 4

Fissura petroccipitalis

Question 5

In which species is the os temporale joined to the os occipital and with what?

Answer 5

Ca, by the sutura occipitotympanica

Question 6

List the facies of pars squamosa?

Answer 6

facies cerebralis and facies temporalis (outside)

Question 7

What does facies cerebralis present?

Answer 7

sulci arteriosi et venosi
impressiones digitatae
juga cerebrallis
crista tentorica (small Ru)

Question 8

What does the facies temporalis of pars squamosa os temporale present?

Answer 8

proc. Zygomaticus
tuberculum articulare
fossa mandibularis
proc. retroarticularis
foramen retroarticulare
proc. occipitalis
proc. retrotympanica
meatus temporalis
fossa temporalis
crista temporalis

Question 9

What species does not have tuberculum articulare?

Answer 9

Ca

Question 10

Which structure forms the mandibular joint?

Answer 10

tuberculum articulare

Question 11

What does pars petrosa enclose?

Answer 11

inner ear

Question 12

What perforated the medial surface of pars petrosa?

Answer 12

porus acusticus internus

Question 13

What are the 3 areas of the porus acusticus internus?

Answer 13

area n. facialis
area cochlear
area vestibularis dorsalis + ventralis

Question 14

What does area cochlear act as a passage for?

Answer 14

the cochlear branches of N. Vestibulocochlearis (cranial nerve VIII)

Question 15

What does area vestibularis dorsalis and ventralis act as a passage for?

Answer 15

the vestibular branches of N. Vestibulocochlearis (cranial nerve VIII)

Question 16

What does the ventral surface of the pars petrosa present?

Answer 16

promontorium
fenestra vestibuli (ovale)
fenestra cochlea (rotundum)
crista partis petrosae

Question 17

What species is crista partis petrosae present in and what does it do?

Answer 17

Ca and Eq

it separates the rost + med surfaces of pars petrosa

Question 18

What are the structures of pars petrosa?

Answer 18

porus acusticus internus
proc. mastoideus
proc. styloideus
canalis facialis

Question 19

what species is proc. mastoideus not present in?

Answer 19

Su

Question 20

Describe the proc. mastoideus in the relevant species?

Answer 20

Bo - low ridge
Eq - tuberosity
Small Ru - roughened area

Question 21

what species is proc. styloideus present in and what is its function?

Answer 21

Ru and Eq

attachment of hyoid

Question 22

where does the canalis facialis end?

Answer 22

foramen stylomastiodeum ( n.facialis VII )

Question 23

describe the canalis facialis in Ca?

Answer 23

it is between proc. mastoideus and tympanica

Question 24

describe the canalis facialis in Eq and Ru?

Answer 24

it is between proc. mastoideus and proc. styloideus

Question 25

what are the structures of pars tympanica?

Answer 25

``` bulla tympanica meatus acusticus externa vagina proc. styloidei proc. muscularis fissura petrotympanica pars ossea tubae auditivae canalis musculotubarius ```

Question 26

where does the meatus acusticus externa open?

Answer 26

porus acusticus externus

Question 27

what species is the vagina proc. styloidei present in?

Answer 27

Eq and Bo

Question 28

describe the proc. muscularis in the relevant species

Answer 28

it projects rostoventrally from bulla ca + su - short thorn eq - long rod bo - broad base

Question 29

what species is the septum bullae present in?

Answer 29

ca

Question 30

the pars ossea tubae auditivae is a connection between?

Answer 30

cavum tympani and pharynx

Question 31

canalis musculotubarius consists of?

Answer 31

semicanalis tubae auditivae semicanalis m. tensor tympanii septum canalis musculotubarii

Question 32

what is the external surface of os parietale made up of?

Answer 32

``` planum temporale (lateral sides) planum parietale (dorsal) ```

Question 33

what is the name of the planum parietale in Ru?

Answer 33

planum nuchae

Question 34

what are the structures of os parietale?

Answer 34

``` planum temporale and parietale (nuchae in Ru) linea temporalis crista sagittalis externa crista sagittalis interna proc. tentoricus tentorium cerebelli osseum ```

Question 35

in what species is the crista sagittalis externa present in?

Answer 35

eq and ca

Question 36

in what species is the crista sagittalis interna present in?

Answer 36

bo and su

Question 37

the tentorium cerebelli osseum is formed from?

Answer 37

proc. tentoricus of os parietale, interparietale and occipitale

Question 38

what species is the proc. tentoricus in?

Answer 38

eq and ca

Question 39

what are the structures of the os interparietale ?

Answer 39

``` linea temporalis crista sagittalis externa proc. tentoricus eminentia cruciformis canalis sinus transversii ```

Question 40

what is the os interparietale?

Answer 40

paired bones fused by sutura sagittalis

Question 41

where is the os interparietale located?

Answer 41

in the median plane between os parietale and os occipital

Question 42

what species is the eminentia cruciformis present in?

Answer 42

Ru instead of osseus tentorium