The Skull (Study Guide)

Question 1

Sutures

Answer 1

Fixed immovable joints (synarthrodial), are exclusive to the skull

Question 2

Skull

Answer 2

cranium or braincase

Question 3

Calvaria

Answer 3

skull cap

Question 4

Floor of the skull’s 3 divisions

Answer 4

1. Anterior cranial fossa
2. Posterior cranial fossa
3. Middle cranial fossa

Question 5

Base of the skull’s bony markings

Answer 5

• Foramen magnum
• mastoid
• styloid process

Question 6

Total # of bones of the skull

Answer 6

22 irregular & flattened bones

29 with malleus (2), incus (2), stapes (2), and hyoid bone

Question 7

8 Cranial Bones

Answer 7

Frontal (1)
Parietal (2, paired)
Occipital (1)
Temporal (2)
Ethmoid (1)
Sphenoid (1)

Question 8

Frontal Bone

Answer 8

• Unpaired cranial bone
• forms lower and posterior portion of the cranium
• Contains foramen magnum
• Undersurface= contains condyles for articulation of first cervical vertebrae
• Anterior to the foramen magnum (basilar portion)= contacts sphenoid bone

Question 9

Parietal Bone

Answer 9

• Paired (2) cranial bone
• forms the roof of the cranium
• separated by the sagittal sutures
• separated from the frontal bone by the coronal suture

Question 10

Occipital bone

Answer 10

• unpaired cranial bone
• forms lower and posterior portion of the cranium
• contains foramen magnum
• Undersurface= contains condyles for articulation of first cervical vertebrae
• Anterior to the foramen magnum (basilar portion) = contacts sphenoid bone

Question 11

Temporal bone’s parts

Answer 11

1. Squamous
2. Petrous
3. Mastoid
4. Tympanic
5. Styloid

Question 12

Temporal Bone

Answer 12

Paired (2)
Forms lateral aspect of the skull
Contains 5 parts

Question 13

Ethmoid Bone

Answer 13

• Unpaired cranial bone
• Contributes to facial skeleton
• Delicate
• Lies between the frontal bone and contributes to the wall of the orbit and nasal cavities and anterior aspect of the cranial base

Question 14

Ethmoid Bone is posterior to the

Answer 14

lacrimal bone

Question 15

Ethmoid bone contains

Answer 15

• the horizontal cribriform plate

- olfactory nerve emerges from the nasal cavity through these holes

Question 16

Olfactory nerve is responsible form our…

Answer 16

sense of smell

Question 17

Sphenoid Bone

Answer 17

-Unpaired (1)
-Butterfly shaped
-most complex bone of the skull
forms a portion of the floor and base of skull
-posterior to the ethmoid bone
- anterior to foramen magnum

Question 18

Composition of Sphenoid bone

Answer 18

• Central body
• 2 sinuses
• 2 greater wings
• 2 lesser wings
• 2 Pterygoid processes or plates (medial and lateral)

Question 19

Sphenoid spines

Answer 19

at the point where the greater wings join the body

form attachment of the veli palatini muscle of the soft palate

Question 20

Sphenoid bone contains:

Answer 20

superior orbital fissure

Question 21

Anterior of sphenoid is…

Answer 21

ethmoid bone

Question 22

Sphenoid Bone comprises..

Answer 22

orbit of the eye

Question 23

Sphenoid bone foramen

Answer 23

• two that carry CN V (5th cranial nerve)
• foramen rotundum carries the maxillary branch
• foramen ovale carries the mandibular branch

Question 24

anterior of the sphenoid body forms…

Answer 24

the posterior of the nasal cavity

Question 25

14 Facial Bones:

Answer 25

``` Mandible Maxillae (2) Nasal Bones (2) Palatine bones (2) Lacrimal bones (2) Zygomatic bones (2) Inferior conchae (2) Vomer ```

Question 26

Mandible

Answer 26

``` Unpaired lower jaw largest bone of the face single bone in adults at birth, it is joined into 2 halves by a mental symphysis or mandibular symphasis...fibrous joint ```

Question 27

Mental proturberance

Answer 27

triangular projection at the lower end of the mental symphasis that is the point of the chin usually depressed in the middle gives rise to 2 anterior projections or mental tubercles

Question 28

mental foramen

Answer 28

2 holes in the chin that serves as an exit for nerves

Question 29

Inner Surface: Mandible | mental spines located near:

Answer 29

symphysis

Question 30

Inner Surface: Mandible: | alveolar arch:

Answer 30

the tooth bearing portion of the mandible (upper part)