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Flashcards in skull anatomy test study guide Deck (88):
0

How many bones make up the skull?

22

1

How many bones are cranial bones?

8

2

How many bones are facial bones?

14

3

The cranial bones are divided into two categories, what are they?

Calvaria and floor

4

Which bones are bones of the Calvaria?

◾️frontal
◾️occipital
◾️right parietal
◾️left parietal

5

Which bones are cranial floor bones?

◾️ethmoid
◾️sphenoid
◾️right temporal
◾️left temporal

6

Know what the Squama is on all bones?

The main portion of the bone. Body of bone.
◾️occipital
◾️frontal
◾️parietal
◾️temporal

7

What's the dipole?

Inner layer of spongy bone separating two outer plates of compact tissue

8

What are sutures?

Joints between the cranial bones

9

What are fontanelles?

Areas of incomplete ossification in infant skulls.

➡️There are 6.

10

Where's the coronal suture?

Between frontal and parietal bones

11

Where is the sagittal suture?

On top of head between two parietal bones

12

Where's the squamosal suture?

Between temporal bone and parietal bones

13

Where's the lambdoidal suture?

between occipital and parietal bone

14

What is the Bregma?

Junction of coronal and sagittal sutures

15

What is the lambda?

Junction of sagittal and lambdoidal sutures

16

When adult cranial size is usually achieved?

By age 12

17

What are the 3 general regions of the cranial floor?

◾️anterior cranial fossa
◾️ middle cranial fossa
◾️posterior cranial fossa

18

What's the glabella?

Smooth elevated arch between the supercillary arches

19

What are the orbital plates?

Roofs of the orbit

20

What's the supraorbital foramen?

Opening in the center of the margin

21

What's the supercillary arch?

Located where the eyebrows are

22

What are the supraorbital margins?

Superior part of orbit

23

What's the frontal eminence?

Rounded elevation on either side

24

What's the Squama?

Forms forehead and anterior part of cranial vault

25

What are the frontal bone parts?

◾️glabella
◾️orbital plates
◾️supraorbital foramen
◾️supercillary arch
◾️supraorbital margins
◾️frontal eminence
◾️Squama

26

What are some ethmoid parts?

◾️superior and middle nasal conchae
◾️labyrinths
◾️perpendicular plate
◾️Cristi galli
◾️Cribiform plate

27

What's the superior and middle nasal conchae?

Two thin scroll shaped projections

28

What's the labyrinths?

Contains the ethmoid sinuses or air cells

29

What's the perpendicular plate?

Vertical portion that forms the superior portion of bony nasal septum

30

What's the Cristi galli?

Projects superiorly from midline

31

What's the cribiform plate?

Horizontal portion with many small holes in it for transmission of the olfactory nerves

32

What is the parietal bone surrounded by?

4 sutures of the skull

33

What is the parietal eminence?

Prominent bulge near center of external surface of each bone

34

What shape is the sphenoid?

Wedge shaped or bat

35

Where does the pituitary gland sit?

By the anterior and posterior clinoid processes

➡️sella turcia

36

What's the pterygoid hamulus?

Help form the nasal cavity

37

What's the pterygoid process?

Help form the nasal cavity

38

What's the posterior clinoid process?

Top borders of dorsum sellae

39

What's the dorsum sellae?

Posterior part of sella turcia

40

What's the tuberculum sellae?

Anterior part of sella turcia

41

What's the sella turcia?

A deep depression on superior surface of the body

42

What are the greater wings?

arise from the sides of the body and curve laterally

The bigger ones

43

What are the lesser wings?

Triangular shaped and the most anterior horizontal part of the sphenoid

44

What's the clivus?

Slanted area of bone posterior and inferior to dorsum

➡️pons of brains lay on it

45

What's the body?

Center part of sphenoid contains the 2 sphenoid sinuses

46

What's the anterior clinoid process?

Two bony processes that project posteriorly from the medial ends of lesser wings

47

What's the optic foramen?

Located under lesser wings and projects into posterior orbit

➡️opens into the apex of the orbit

48

What are some parts of the sphenoid?

◾️pterygoid hamulus
◾️pterygoid process
◾️posterior clinoid process
◾️dorsum sellae
◾️tuberculum sellae
◾️sella turcia
◾️greater wings
◾️lesser wings
◾️clivus
◾️body
◾️anterior clinoid process
◾️optic foramen

49

What are some parts of the occipital bone?

◾️occipitoatlantal joint
◾️foramen magnum
◾️basilar portion
◾️occipital condyles

50

What's the occipitoatlantal joint?

Only bony articulations between the skull and the neck

51

What's the foramen magnum?

Large opening through which medulla oblongata passes as it exits

52

What's the basilar portion?

Where occipital condyles fuse at to complete the foramen magnum

➡️occipital bone

53

What are the occipital condyles?

They project anteriorly from each side of squama

54

What's some parts of the temporal bone?

◾️petromastoid portion
◾️zygomatic process
◾️styloid process
◾️tympanic portion
◾️IAM
◾️petrous portion
◾️mastoid process
◾️EAM
◾️mandibular fossa

55

What's the petromastoid portion?

The petrous and mastoid portions together

➡️contains the organs of hearing and balance

56

What's the zygomatic process?

Prominent arched process that projects anteriorly to articulate with the zygoma and complete the zygomatic arch
➡️part of the zygomatic arch

57

What's the styloid process

Slender pointed bone projecting from the EAM

58

What's the tympanic portion?

Below the squama and in front of mastoid and petrous portions

59

What's IAM.?

Internal auditory meatus. Located at the medial end of the petrous ridge

➡️correlates with EAM but is inside the skull

60

What is the Petrous portion?

Located internally, pyramid in shape, and the thickest densest bone in the cranium

➡️densest bone in the cranium

61

What's the mastoid process?

Large bony prominence located directly behind the EAM and contains the mastoid air cells

62

What's the EAM?

Outer opening into the ear

63

What's the mandibular fossa?

Receives condyles of mandible to form the tempormandibular (TMJ)

64

Where's the mastoid tip?

Bump behind the ear

65

What is the ear?

The organ of hearing

66

What's the TEA? (Top of ear attachment)

Where ear attaches to head

67

What's the EAM?

External auditory meatus, opening into the ear

68

What's the mental point of the mandible?

Tip of chin

69

What's the gonion?

Angle of mandible

70

What's the EOP?

External occipital protuberance; bump on back of head

71

What's the acanthion?

Junction of the upper lip and nose

72

What's the supraorbital margin?

Upper border of orbit

73

What's the infraorbital margin?

Lower border of the orbit

74

What's the nasion?

Located at the junction of nose and frontal bones between the eyes depression

75

What's the outer canthus?

Outside corner of the eye

76

Inner canthus?

Inside corner of eye

77

Where's the glabella?

Between eyebrows

78

What's the angle of mandible?

Gonion

79

What's the mentomeatal line? (MML)

Mental point ➡️ EAM

80

What's the acanthiomeatal line?(AML)

Acanthion➡️EAM

81

What's the IPL(interpupillary line)?

Perpendicular line between pupils of eyes

82

What's the glabellomeatal line? GML

Glabella➡️EAM

83

What's the infraorbital line? (IOML)

From infraorbital margin ➡️ EAM

84

What's the orbitomeatal line? OML

Outer canthus ➡️ EAM

85

What's the MSP?

Divides body into equal right and left halves

86

What's MCP?

Divides the body into equal anterior and posterior parts

87

Look over these diagrams

Pg 286
➡️20-34
➡️20-35