UNIT 5: Bones of the Skull

Question 1

skull =

Answer 1

all bones of the head

Question 2

cranium =

Answer 2

skull to mandible

Question 3

bones of the cranium can be divided into two groups

Answer 3

neurocranium
viscerocranium

Question 4

neurocranium

Answer 4

aka cranial skeleton

forms a vault for the brain, floor of the neurocranium is called cranial base

Question 5

visecerocranium

Answer 5

aka facial skeleton

forms the upper facial skeleton; inferior and anterior to the neurocranium

Question 6

neurocranium consists of ___ bones

Answer 6

8

Question 7

sutures are…

Answer 7

fibrous joints bw bones that make up the viscerocranium and the vault of the neurocranium

Question 8

visceorcranoum consists of ____ bones and the ______

Answer 8

13
mandible

Question 9

describe the frontal bone

Answer 9

ossifies in adulthood to form a single bone

dorms bony forehead, anterior to brain case and the roof of the orbital cavity

Question 10

the frontal bone articulates w two bones of the viscerocranium

Answer 10

zygomatic bone via zygomatic process
nasal bone via nasal portion

Question 11

parietal bones

Answer 11

large paired bones - 2 of them

form the greater portion of the superior and lateral surfaces of the cranium

join w other bones at the 4 largest sutures (sagittal, coronal, lambdoidal, squamousal)

constitutes bulk of cranial vault

Question 12

occipital bone

Answer 12

forms the posterior and inferior surfaces of the brain case

articulates w temporal, parietal, and sphenoid bones of neurocranium

Question 13

temporal bones

Answer 13

paired bones (2 of them) that form the lateral base and sides of the brain case

Question 14

what does the temporal bone house?

Answer 14

the sensory mechanisms involved in hearing and equilibrium

Question 15

what are the 4 parts of the temporal bone?

Answer 15

squamous =anterior and upper portion

tympanic = curved plate of bone

petrous = projects into skull base bw sphenoid and occipital

mastoid = posterior, external portion

Question 16

ethmoid bone

Answer 16

complex, delicate structure at the core of cranium and facial skeleton

forms part of the walls of the cranial, nasal, and orbital spaces

Question 17

sphenoid bone

Answer 17

very complex bone located at the base of the skull; significant contributor to cranial structure

Question 18

what are the three important features of the sphenoid bone

Answer 18

greater wings
medial and lateral pterygoid plates
foramina

Question 19

what are the three cranial fossae?

Answer 19

anterior
middle
posterior

Question 20

anterior cranial fossa

Answer 20

anterior 1/3
houses the frontal lobes of the brain
floor formed by the frontal bone, crista galli, and cribiform plate of ethmoid bone, lesser wings of sphenoid

Question 21

middle cranial fossa

Answer 21

contains temporal lobes of the brain
body and greater wings of sphenoid, squamous, and petrous portions of temporal bone

Question 22

posterior cranial fossa

Answer 22

largest and deepest of the 3
contains occipital lobe, cerebellum and brainstem, floor contains foramen magnum (passageway of spinal cord)

basisphenoid, basiooccipital, petrous and mastoid portions of temporal bone, parietal and occipital

Question 23

upper facial skeleton consists primarily of…

Answer 23

upper jaw and the oribital and nasal cavities

Question 24

maxillae

Answer 24

paired (there are 2 of them), largest bones of the face (besides mandible)
contribute to roof of mouth, nose, upper dental arch

Question 25

5 processes of the maxillae

Answer 25

zygomatic
frontal
orbital
alveolar
palatine

Question 26

palatine bones

Answer 26

paired (2 of them)
posterior to maxillae
part of 3 cavities: nasal, orbital and oral

Question 27

orbital plate of the palatine bone forms

Answer 27

small portion of medial orbit

Question 28

horizontal plate of palatine bones forms

Answer 28

posterior 1/4 of hard palate
posterior nasal spine and nasal crest in floor

Question 29

sphenoidal process of palatine bones articulates w

Answer 29

spehnoid

Question 30

zygomatic bones

Answer 30

paired (2 of them) - articulate w maxilla, frontal, temporal, and sphenoid bones

Question 31

4 processes of zygomatic bones

Answer 31

frontal
orbital
temporal
maxillary

Question 32

Lacrimal bones

Answer 32

paired (2 of them); smallest facial bones
articulate w maxillae, frontal bone, ethmoid, and inferior nasal conchae (in nasal cavity)

medial wall in orbital cavity
lateral wall in nasal cavity

contains a depression that houses the nasolacrimal sac

Question 33

nasal bones

Answer 33

paired (2 of them)
articulate w frontal, maxillae, perpendicular plate of ethmoid

meets nasal septal cartilage anteriorly

forms the bony bridge of the nose

Question 34

inferior nasal conchae

Answer 34

paired (2 of them), thin, curved bones projecting from the lateral wall of the nasal cavity

largest of the 3 conchae (located inferior to middle nasal conchae of the ethmoid bone)

Question 35

mucosal covering of all 3 conchae is

Answer 35

thick, richly vascularized

Question 36

vomer

Answer 36

single bone
forms inferior and posterior portion of the nasal septum (medial wall)
articulates w sphenoid and perpendicular plate of ethmoid

Question 37

mandible

Answer 37

single bone in adults (fuses during dev)

Question 38

the skull is comprised of individual and paired bones that contribute to the _____ and _____

Answer 38

neurocranium
viscerocranium

Question 39

_____ provide immovable joints bw bones inc the ______ _____ of the cranial vault

Answer 39

sutures
structural integrity