Skull anatomy Flashcards
The zygomatic arch is made up of which bones?
The zygomatic process of the temporal bone and the temporal process of the zygomatic bone
The walls of the cranial cavity tend to be thinnest in areas that are not covered with muscles. T/F
FThey tend to be thinnest in areas covered with muscles.
Which bone can be considered both part of the neurocranium and viscerocranium?
Ethmoid
The largest fontanelle
Anterior fontanelle
Most dynamic of our bones
Mandible
Carotid canal is found in which fossa?
Middle
At birth, the bones of the calvaria are smooth and unilaminar. T/F
T
The median point of the anterior border of the foramen magnum [Identify]
Basion
Stylomastoid foramen is found on which bone?
Temporal
What is not seen in the inferior view of the skull?
A. foramen magnum
B. foramen rotundum
C. foramen lacerum
D. foramen spinosum
B
How many bones are found in the head?
29
22 cranial bones, 6 ear bones, 1 hyoid bone
Early closure of the sutures of the skull can lead to craniosynostosis. Confluence sutures correspond to fontanelles in young skulls. Which of the following do not correspond?
a. Vertex: Anterior Fontanelle
b. Pterion: Sphenoid fontanelle
c. Asterion: Mastoid foramen
d. Lambdoid: Posterior fontanelle
A
What characteristics of the calvarium provides protection from blunt trauma forces?
A. division by sutures and fontanelles
B. supported by horizontal and vertical buttresses
C. double layer of compact bone
D. thickest in area covered by muscle
B
Which structures are used as reference for the skull’s anatomical position?
Inferior margin of the orbit, and superior margin of the external acousttic meatus opering
Carotid canal is found on which bone?
Temporal
How does the fontanelle indicate degree of hydration of an infant?
A depressed fontanelle indicates dehydration
Which covering of the skull is thinner and more brittle: internal table or external table?
Internal table.
External table has to be thicker and harder for stronger bone structure.
Scaphocephaly results from early closure of which suture?
Sagittal
This part of the skull base marks the posterior border of the middle cranial fossa
a. dorsum sella
b. tuberculum sella
c. pituitary fossa
`d. clivius
A
When does posterior fontanelle close?
2 months after birth
The mandible supports the lower teeth. True or false?
True
What is the main landmark in searching for the facial nerve?
A. buccal muscle
B. masseter
C. external acoustic meatus
D. mastoid tip
D
When does the obliteration of sutures between bones of the calvaria usually begin?
30 and 40 years on internal surface
10 years later on external surface
The facial bones compose which part of the skull?
Viscerocranium
Which bone has the greatest contribution in the upper facial skeleton?
Maxilla
Junction of coronal and sagittal sutures [Identify]
Bregma
The landmark on the skull where the frontal, sphenoidal, temporal, and parietal bones meet
.a. basion
b. opisthion
c. asterion
d. pterion
D
Which separate the anterior cranial fossa from the middle cranial fossa?
Sphenoid ridge/ posterior margin of the lesser wing of the sphenoid bone,and the anterior margin of the chiasmatic sulcus
The cribriform foramen is found in which fossa?
Anterior
The convexity of the calvaria distributes and thereby minimizes the effects of a blow to the head. T/F
T
The calvaria is composed mostly of flat bones. True or false?
True.
What is malar flush?
Redness of the skin covering the zygomatic prominence (malar eminence)
Union of mandibular bones begin at what age?
1st year
Completion of the union of the mandibular bone is at what age?
2 years old
Describe Le Fort II fractures
passes from the posterolateral parts of the maxillary sinuses superomedially through the infra-orbital foramina, lacrimals or ethmoids to the bridge of the nose. results in the separation of the entire central part of the face from the rest of the cranium
Which is not part of the temporal bone?
A. EAC
B. IAC
C. vestibular aqueduct
D. jugular foramen
D
Internal auditory hiatus is found in which fossa?
Posterior
Incisive canals are found on which bone?
Palatine process of maxilla
What is the frontal lobe landmark?
A. pterion
B. lambda
C. inion
D. asterion
A
The supraorbital fissure is found in which fossa?
Middle
Frontal suture is obliterates by what age?
8 years old
The optic canal is found in which fossa?
Middle
Cause of black eye when skin of the orbit bruises
Accumulation of tissue fluid and blood in the surrounding connective tissue, which gravitates into the superior eyelid and around the eye
How many cranial bones are there in total?
22
8 paired (16 total): Temporal, parietal, nasal, lacrimal, maxilla, palatine, inferior nasal conchae/turbinate, zygomatic
6 unpaired: Mandible, ethmoid, vomer, frontal, occipital, sphenoid
Union of the frontal bones begin at which age?
2 years old
After increasing in capacity, the calvaria increases slightly in size, as a result of bone thickening, for how long?
3-4 years
Oxycephaly or turricephally results from early closure of which suture?
Coronal
The suture that connects the parietal bones. [Identify]
Sagittal suture
Crista galli is part of which bone?
Ethmoid bone
Part of occiput that forms the main joint between the head and neck as it articulates with atlas
a. acetabulum
b. condyle
c. asterion
d. basion
B
Foramen magnum is found in which fossa?
Posterior
Condyloid canal is found on which bone?
Occipital
For how long does the calvaria increase in capacity?
15-16 years
An excavated skull showed 1 erupted tooth. how old is this?
a. 4 months
b. 8 months
c. 6 months
d. 10 months
C
The viscerocranium can also be called the spanchnocranium. True or false?
True.
The most prominent point of external occipital protruberance [Identify]
Inion
Fractures of the pterion of the skull may result to tear of the artery supplying the anterior lateral meninges causing epidural hematoma. Where does this artery pass through the skull?
A. foramen ovale
B. foramen rotundum
C. foramen spinosum
D. foramen lacerum
C