Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

Procedures > Chapter 20 - Skull, Facial bones, & sinuses > Flashcards

Chapter 20 - Skull, Facial bones, & sinuses Flashcards

(91 cards)

Start Studying
1
Q

How many bones is the skull composed of?

A

22 bones

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What 2 distinct groups are the bones of the skull divided into?

A

Cranial & facial

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

How many cranial bones are there?

A

There are 8 cranial bones

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

How many facial bones are there?

A

There are 14 facial bones

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What two categories are the cranial bones divided into?

A

The calvaria & floor

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What bones are listed in the calvaria?

A

Frontal (1), occipital (1), parietal (2)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What bones are listed in the floor?

A

Ethmoid (1), Sphenoid (1), Temporal (2)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What are the functions of the cranial bones?

A

Form a protective housing for the brain

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What are the functions of the facial bones?

A

Provide structure, shape, and support for the face, & form a protective housing for the upper ends of the respiratory and digestive tracts

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What are the 14 facial bones?

A

Nasal (2), Lacrimal (2), Maxillary (2), Zygomatic (2), Palatine (2), Inferior nasal conchae (2), vomer (1), mandible (1)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What are the bones of the cranium and face joined by?

A

Fibrous joints called sutures

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Name the 4 sutures

A
  1. coronal
  2. sagittal
  3. squamosal
  4. lambdoidal
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Where is the coronal suture found?

A

Between the frontal and parietal bones

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Where is the sagittal suture found?

A

It is located on the top of the head between the two parietal bones and just behind the coronal suture line

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is the name of the junction of the coronal and sagittal sutures?

A

bregma

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Where is the squamosal suture found?

A

Between the temporal bones and the parietal bones

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Where is the lambdoidal suture found?

A

Between the occipital bone and parietal bones

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What is the name of the junction of the lambdoidal and sagittal sutures?

A

The lambda

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What forms the pterion?

A

On the lateral aspect of the skull, the junction of the parietal bone, squamosal suture, and the greater wing of the sphenoid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What forms the asterion?

A

The junction of the occipital bone, parietal bone, and mastoid portion of the temporal bone

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

What is the name of the six areas of incomplete ossification in newborns?

A

Fontanels

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Where is the anterior fontanel located?

A

At the junction of the two parietal bones and the one frontal bone at the bregma

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

Where is the posterior fontanel located?

A

posteriorly and in the midsagittal plane at the lambda

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

Where are the two sphenoidal fontanels located?

A

At the site of the pterion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Where are the two mastoid fontanels located?
At the site of the asteria
26
When do the posterior and sphenoidal fontanels normally close?
In the 1st and 3rd months after birth
27
When do the anterior and mastoid fontanels close?
During the 2nd year of life
28
At what years does the cranium develop rapidly in size and density?
During the first 5 or 6 years
29
How many regions is the cranial floor divided into?
3 | The anterior, middle, & posterior cranial fossa
30
Where is the anterior cranial fossa?
It extends from the anterior frontal bone to the lesser wings of the sphenoid. It is associated mainly with the frontal lobes of the cerebrum
31
Where is the middle cranial fossa?
It accommodates the temporal lobes and associated neurovascular structures and extends from the lesser wings of the sphenoid bone to the apices of petrous portions of the temporal bones
32
What is the name of the deep depression posterior to the petrous ridge & what it its function?
It is called the posterior cranial fossa & it protects the cerebellum, pons, and medulla oblongata
33
What is the shape of the average or so-called normal cranium?
It is more or less oval in shape, wider in back than in front
34
What are the measurements of the average cranium?
The average cranium measures approx. 6 inches at its widest point from side to side, 7 inches at its longest point from front to back, and 9 inches at its deepest point from vertex to submental region
35
What is the vertical portion of the frontal bone called?
The frontal squama
36
What does the frontal squama form?
The forehead and the anterior part of the vault
37
What do the horizontal portions of the frontal bone form?
The orbital plates, part of the roof of the nasal cavity, and the greater part of the anterior cranial fossa
38
What is on each side of the midsagittal plane of the superior portion of the sqauama and is elevated?
The frontal eminence
39
What is below the frontal eminences, just above the supraorbital margins?
The superciliary arches
40
What is the name of the opening for nerves and blood vessels called that is located in the center of the supraorbital margin?
Supraorbital foramen
41
What is the name of the smooth elevation between the superciliary arches?
glabella
42
Where are the frontal sinuses situated?
Between the two tables of squama on each side of the midsagittal plane
43
Where does the squama articulate with the parietal bones?
At the coronal suture, the greater wing of the sphenoid bone at the frontosphenoidal suture, and the nasal bones at the frontonasal suture
44
What is the midpoint of the frontonasal suture termed?
The nasion
45
What does the frontal bone articulate with
The right and left parietals, the sphenoid, and the ehtmoid bones of the cranium
46
What are the orbital planes of the horizontal portion of the frontal separated by?
The ethmoidal notch
47
What does the ethmoidal notch receive?
The cribiform plate of the ethmoid bone
48
What small projection of bone is at the anterior edge of the ethmoidal notch?
The nasal spine
49
What is the superiormost component of the bony nasal septum?
The nasal spine
50
What does the ethmoid bone consist of?
A horizontal plate, a vertical plate, and two light, spongy lateral masses called labryinths
51
Where is the ethmoid bone situated?
Between the orbits
52
What does the ethmoid bone form?
The nasal cavity and orbital walls, the anterior cranial fossa, and the bony nasal septum
53
What is the name of the horizontal portion of the ethmoid bone?
The cribiform plate
54
What is the cribriform plate perforated by?
Many foramina for the transmission of olfactory nerves
55
What is attached to the cribiform plate that projects superiorly from its anterior midline and serves as the anterior attachment for the falx cerebri?
crista galli
56
What is the vertical portion of the ethmoid bone called?
The perpendicular plate
57
What does the perpendicular plate form?
With the nasal spine, it forms the superior portion of the bony septum of the nose
58
What do the labyrinths contain?
The ethmoidal sinuses, or air cells
59
What project inferiorly from each medial wall of the labyrinths?
Superior and middle nasal conchae
60
What does the ethmoid bone articulate with?
The front and sphenoid bones of the cranium
61
What is the name of the prominent bulge on each parietal bone?
parietal eminence
62
What does each parietal bone articulate with?
The frontal, temporal, occipital, sphenoid, and opposite parietal bone
63
Where is the sphenoid situated?
in the base of the cranium anterior to the temporal bones and basilar part of the occipital bone
64
What does the sphenoid consist of?
A body, two lesser wings, two greater wings, and two pterygoid processes
65
What does the body of the sphenoid contain?
Two sphenoidal sinuses which are incompletely separated by a median septum
66
What does the stella turcica contain?
The pituitary gland
67
Where does the stella turcica lie?
In the midsagittal plane of the cranium at a point 3/4 inch anterior and 3/4 inch superior to the level of the EAM.
68
What is the stella turcica bounded by?
Anteriorly by the tuberculum sellae and posteriorly by the dorsum sellae which bears the posterior clinoid processes
69
What is the name of the slanted area of bone posterior and inferior to the dorsum sellae and continuous with the basilar portion of the occipital bone?
The clivus
70
What does the clivus support?
The pons
71
What is on either side of the stella turcica?
A groove called the carotid sulcus in which the internal carotid artery and cavernous sinus lie
72
Where does the optic groove extend?
Across the anterior portion of the tuberculum sellae
73
Where does the optic groove end?
On each side at the optic canal
74
What is the optic canal?
The opening into the apex of the orbit for the transmission of the optic nerve and ophthalmic atery aka optic foramen
75
What do the lesser wings of the sphenoid bone form?
the posteromedial portion of the roofs of the orbits, the posterior portion of the anterior cranial fossa, the upper margin of the superior orbital fissures, and the optic canals.
76
What do the medial ends of the posterior borders of the lesser wings form?
The anterior clinoid processes
77
What do the greater wings of the sphenoid bone form?
Part of the middle cranial fossa, the posterolateral walls of the orbits, the lower margin of the superior orbital sulci
78
What is situated in the greater wings?
The foramina rotundum, ovale, and spinosum are paired and are situated in the greater wings
79
What does the sphenoid bone articulate with?
Each of the other seven bones of the cranium
80
Where is the occipital bone situated?
At the posteroinferior part of the cranium
81
What does the occipital bone form?
The posterior half of the base of the cranium and the greater part of the posterior cranial fossa
82
What are the four parts of the occipital bone?
The squama, two occipital condyles, and the basilar portion
83
What is the name of the large aperature associated with the occipital bone?
Formaen magnum
84
What passes through the foramen magnum?
The inferior portion of the medulla oblongata as it exits the cranial and joins the spinal cord
85
What is the name of the prominent process on the external surface of the squama on the occipital bone, midway between its summit and the foramen magnum?
External occipital protuberance or inion
86
What two parts does the external ear consists of?
The Auricle & the EAM
87
The auricle has a deep central depression called what?
The concha
88
About how long is the EAM?
1 inch long
89
What is the name of the prominent cartilaginous lip on the auricle?
The tragus
90
What is the name of the outer rim of the ear?
The helix
91
What does the middle ear consist of?
The tympanic membrane, the tympanic cavity and three small bones called the auditory ossicles

Procedures (1 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions