The Skull (Study Guide) Flashcards
1
Q
Sutures
A
Fixed immovable joints (synarthrodial), are exclusive to the skull
2
Q
Skull
A
cranium or braincase
3
Q
Calvaria
A
skull cap
4
Q
Floor of the skull’s 3 divisions
A
- Anterior cranial fossa
- Posterior cranial fossa
- Middle cranial fossa
5
Q
Base of the skull’s bony markings
A
- Foramen magnum
- mastoid
- styloid process
6
Q
Total # of bones of the skull
A
22 irregular & flattened bones
29 with malleus (2), incus (2), stapes (2), and hyoid bone
7
Q
8 Cranial Bones
A
Frontal (1) Parietal (2, paired) Occipital (1) Temporal (2) Ethmoid (1) Sphenoid (1)
8
Q
Frontal Bone
A
- 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
9
Q
Parietal Bone
A
- Paired (2) cranial bone
- forms the roof of the cranium
- separated by the sagittal sutures
- separated from the frontal bone by the coronal suture
10
Q
Occipital bone
A
- 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
11
Q
Temporal bone’s parts
A
- Squamous
- Petrous
- Mastoid
- Tympanic
- Styloid
12
Q
Temporal Bone
A
Paired (2)
Forms lateral aspect of the skull
Contains 5 parts
13
Q
Ethmoid Bone
A
- 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
14
Q
Ethmoid Bone is posterior to the
A
lacrimal bone
15
Q
Ethmoid bone contains
A
- the horizontal cribriform plate
- olfactory nerve emerges from the nasal cavity through these holes