The Skull

Question 1

Number of bones in the skull

Answer 1

22

Question 2

What connects the skull bones?

Answer 2

Fibrous sutures

Question 3

What is the exception to skull movement?

Answer 3

Temporomandibular joints

Question 4

Role of skull

Answer 4

Protect the brain, eyes (orbit), nasal cavity structures, oral cavity structures

Question 5

Visible bones from frontal view of the skull (19)

Answer 5

Frontal bone (1)
Parietal bones (2)
Temporal bones (2)
Sphenoid bone (1)
Zygomatic bones (2)
Maxilla bones (2)
Mandible (1)
Lacrimal bones (2)
Nasal bones (2)
Ethmoid bone (1)
Vomer (1)
Inferior nasal conchae (2)

Question 6

Drainage of sphenoid sinus

Answer 6

Into superior meatus

Question 7

Drainage of ethmoid sinus

Answer 7

Into superior meatus

Question 8

Drainage of maxillary sinus

Answer 8

Into middle meatus

Question 9

Drainage of frontal sinus

Answer 9

Into middle meatus

Question 10

Drainage of nasolacrimal duct

Answer 10

Into inferior meatus

Question 11

Wide inferior extension of temporal bone

Answer 11

Mastoid process

Attachment of sternocleidomastoid

Question 12

Thin inferior extension of temporal bone

Answer 12

Styloid process

Question 13

Hole in temporal bone

Answer 13

External auditory canal (covered by tympanic membrane)

Question 14

Pterion

Answer 14

Thin area of bone covering the middle meningeal artery which, if perforated, can cause extradural haematoma
Spot of weakness
Area where 4 bones join on lateral skull

Question 15

Sagittal suture

Answer 15

Joins both parietal bones together

Question 16

Coronal suture

Answer 16

Joins frontal and parietal bones together

Question 17

Lambdoid suture

Answer 17

Joins together occipital and parietal bones

Question 18

Fontanelles

Answer 18

Soft areas between unfused bones in newborns

Question 19

Differences in newborn skull

Answer 19

Fontanelles
Poorly developed mandible
Short external auditory canal/meatus
Lack of mastoid process

Question 20

Reasons for fontanelles

Answer 20

Brain growth

Manoeuvrability of skull in childbirth

Question 21

Cribiform plate

Answer 21

Part of the ethmoid bones

Full of holes

Question 22

Pituitary fossa

Answer 22

Found in the sphenoid bone on the floor of the skull

Location of the pituitary gland

Question 23

Sphenoid foramina

Answer 23

Optic canal
Superior orbital fissure
Foramen rodundum
Foramen vale
Forale spinarum

Question 24

Foramen lacerum

Answer 24

Between parietal and sphenoid bones (covered by cartilage in life)

Question 25

Foramen in parietal

Answer 25

Internal auditory canal

Question 26

Jugular foramen

Answer 26

For the jugular artery and vein | Between the occipital bone and parietal bone

Question 27

Occipital foramina

Answer 27

Hypoglossal canal | Foramen magnum

Question 28

Cranial nerves and their foramina

Answer 28

``` CN I - Cribiform plate CN II - Optic canal CN III - Superior orbital fissure CN IV - Superior orbital fissure CN V1 - Superior orbital fissure CN V2 - Foramen rotundum CN V3- Foramen ovale CN VI - Superior orbital fissure CN VII - Internal auditory canal CN VIII - Internal auditory canal CN IX - Jugular foramen CN X - Jugular foramen CN XI - Jugular foramen CN XII - Hypoglossal canal Spinal cord - Foramen magnum ```

Question 29

Anterior cranial fossa

Answer 29

Contains frontal lobe

Question 30

Middle cranial fossa

Answer 30

Contains temporal lobe

Question 31

Posterior cranial fossa

Answer 31

Contains cerebellum and occipital lobes

Question 32

Hard palate

Answer 32

Comprised of palatine bones (2) and maxilla

Question 33

Lateral pterygoid plates

Answer 33

Extensions of the ethmoid bone important for mastication

Question 34

Stylomastoid foramen

Answer 34

Exit of CN VII | Near mastoid process

Question 35

Carotid canal

Answer 35

In base of temporal? bone | Carotid artery runs through it

Question 36

Foramen spinosum

Answer 36

Contains middle meningeal artery