Skull and Cranium Flashcards Preview

S1 Anatomy > Skull and Cranium > Flashcards

Flashcards in Skull and Cranium Deck (67):
1

cranial cavity (bony structure)
-function

protective coat for brain and branstem components of the CNS

2

what is directly inside the cranial cavity?

series of connective tissue layers termed mininges

3

function of meninges

protection and support for brain and brainstem
participate in the venous part of the vascular system for the brain
provide limits to various compartments to the brain and cranial cavity

4

important structures evident within the cranial cavity to serve to connect the brain with structures outside of the cranial cavity
-these structures must pass through

blood vessels
cranial nerves
must pass through meningeal layers and bones of cranium

5

bones of the skull

frontal bone
parietal bones
temporal bones
sphenoid bone
occipital bone

6

frontal bone components

supraorbital ridge
-supraorbital foramen (notch)
coronal suture

7

coronal suture function

connects frontal bone to parietal bones

8

parietal bones components

sagittal suture
lambdoid suture
superior and inferior temporal lines

9

sagittal suture function

connects parietal bones

10

lambdoid suture function

connects parietal bones with occipital bone

11

temporal bones
-articulate with...

parietal
occipital
sphenoid
zygomatic

12

temporal bones parts

squamous part (flat part)
petromastoid part
tympanic part

13

petromastoid part of temporal bone
-components

styloid process
-muscle attachment
mastoid process
-muscle attachment
-mastoid air cells

14

tympanic part of temporal bones components

external auditory (acoustic) meatus

15

temporal bones components

zygomatic process (part of zygomatic arch)
-mandibular fossa
pterion

16

pterion of temporal bone
-articulation of...
-when is it completely sealed off?
--implication
-remnant of...

articulation of
-frontal, parietal, sphenoid, and temporal bones (in temporal fossa)
never completely sealed off
-not necessarily the most stable
remnant of fibrous joint

17

sphenoid bone
-used to be called the...
-components

more structures on interior surface of skull
used to be called the pterygoid bone
-spheno- and pterygo- can be used interchangeably
components
-greater and lesser wings
-sphenoid sinuses
-medial and lateral pterygoid plates - infratemporal fossa

18

occipital bone components

occipital condyles
superior and inferior nuchal lines
external occipital protuberance (inion)
foramen magnum
jugular foramen
hypoglossal foramen

19

foramen magnum is between which bones

occipital
temporal

20

bones of the face

nasal bones
maxilla bones
mandible
zygomatic bone

21

maxilla bones components

intermaxillary suture - hard suture
maxillary sinus
zygomatic process
frontal process
infraorbital foramen (notch)

22

mandible
-parts

body
ramus
coronoid process
condylar process

23

body of mandible components

mental foramen
alveolar processes
mylohyoid line

24

mylohyoid line
divides...

sublingual and submandibular fossa

25

ramus of mandible components

lingula
mandibular foramen

26

zygomatic bone
-articulates with...
-component

articulates with
-frontal
-maxilla
-sphenoid
-temporal
component
-zygomatic arch

27

zygomatic arch is made up of...

zygomatic process of temporal bone
temporal process of zygomatic bone

28

orbit
-names of the walls

superior
medial
inferior
lateral

29

superior wall components

orbital plate of frontal bone
lesser wing of sphenoid bone
optic canal

30

medial wall components

ethmoid bone
frontal bone
lacrimal bone
sphenoid bone

31

inferior wall components

maxilla
zygomatic bone
orbital process of palatine bone
inferior orbital fissure - maxillary nerve (CN V)

32

lateral wall components

frontal process of zygomatic bone
greater wing of sphenoid bone
superior orbital fissure - CN III, IV, V, VI

33

infratemporal fossa
-what can be seen in the roof

foramen ovale
foramen spinosum (both can be seen in the sphenoid bone)

34

foramen ovale and foramen spinosum are continuous with...

foramen in middle cranial fossa

35

foramen rotundum (in infratemporal fossa)
-what is it?
-where does it exit?

opening in the floor of the middle cranial fossa
exits at the rostral end of the infratemporal fossa as the inferior orbital fissure (no foramen rotundum in the roof of the infratemporal fossa)

36

borders of infratemporal fossa

ramus of mandible
lateral pterygoid plate of sphenoid bone
styloid process of temporal bone
condylar process of mandible
greater wing of sphenoid bone
-foramen ovale, foramen rotundum

37

hard palate
-components

maxilla - palatine process
palatine bones

38

nasal septum
-made up of...

vomer
perpendicular plates of the ethmoid bone

39

perpendicular plate of ethmoid bone
-location
-this region is covered with...

extends inferiorly from the cribiform plate (part of ethmoid boen with holes) into the nasal cavity
this region of nasal septum covered with epithelium containing the olfactory nerves (CN I) that go through the cribiform plate

40

nose components

nasal bones
frontal processes of maxilla
nasal processes of frontal bone
ethmoid bone
inferior nasal conchae
vomer

41

ethmoid bone components

superior and middle nasal conchae

42

superior and middle nasal conchae
-what are they
-purpose

bone "bubbles" on the lateral side of the nasal cavity
each have a respective meatus (opening) beneath them that connects the sinuses with the nasal cavity

43

fossae of the interior surface of the skull

anterior cranial fossa
middle cranial fossa
posterior cranial fossa

44

anterior cranial fossa
-components

frontal bone
-orbital portion of frontal bone (overlies orbit)
ethmoid bone
-cribiform plate
-crista galli
sphenoid bone
-lesser wing of the sphenoid bone (caudal border of anterior cranial fossa)

45

crista galli function

attachment of falx cerebri

46

cribiform plate function

entrance of olfactory nerves

47

middle cranial fossa
-components
-important arteries

sphenoid bone
-lesser and greater wing forming the rostral border and concavity of the middle cranial fossa
temporal bone
arteries
-internal carotid
-middle meningeal

48

sphenoid bone (in middle cranial fossa)
-important structures

anterior clinoid process
posterior clinoid process
sella turcica
foramina

49

anterior clinoid process
-location
-what is it?

rostral attachment
free edge of tentorium cerebelli

50

posterior clinoid process
-purpose

attachment of diaphragma sella
dural sheath around the infundibular stalk
pituitary gland

51

sella turcica
-shape
-function

saddle shaped
contains pituitary gland

52

foramina
-names

optic canal
superior orbital fissure
foramen rotundum
foramen ovale
foramen spinosum
foramen lacerum

53

optic canal
-what nerve passes through it?

optic nerve (CNII)

54

superior orbital fissure
-what nerves pass through it?

oculomotor (CN III)
trochlear (CN IV)
ophthalmic division of trigeminal nerve (CN V1)
abducens (CN VI)

55

foramen rotundum
-what nerve passes through it

maxillary division of trigenimal nerve (CN V2)

56

foramen ovale
-what nerve passes through it

mandibular division of trigeminal nerve (CN V3)

57

foramen spinosum
-what passes through it

middle meningeal artery

58

foramen lacerum
-function

nothing really, but lies under interal carotid artery

59

temporal bone (middle cranial fossa) parts

squamous and petrous parts
trigeminal impression

60

interal carotid artery
-loaction

enters on the base of the skull through the carotid canal that bends through the base of the temporal bone and then enters middle carnial fossa above foramen lacerum

61

middle meningeal artery
-location

embedded in dura, along temporal bone - pterion

62

posterior cranial fossa
-components

temporal bone
occipital bone

63

temporal bone (posterior cranial fossa)
-which part
-components

petrous part
internal auditory meatus
-facial nerve (CN VII_, vestibulococchlear (CN VIII)
groove for superior petrosal sinus

64

occipital bone
-components

jugular foramen
hypoglossal canal
foramen magnum
grooves for transverse, confluens, sigmoid sinuses

65

jugular foramen
-what nerves pass through?
-what else?

glossopharyngeal (CN IX)
vagus (CN X)
spinal accessory (CN XI)
jugular bulb (sigmoid sinus emptying into the internal jugular vein)

66

hypoglossal canal
-what nerve passes through?

hypoglossal (CN XII)

67

foramen magnus
-continuation between...

brainstem and spinal cord