The Skull (Study Guide) Flashcards

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1
Q

Sutures

A

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

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2
Q

Skull

A

cranium or braincase

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3
Q

Calvaria

A

skull cap

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4
Q

Floor of the skull’s 3 divisions

A
  1. Anterior cranial fossa
  2. Posterior cranial fossa
  3. Middle cranial fossa
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5
Q

Base of the skull’s bony markings

A
  • Foramen magnum
  • mastoid
  • styloid process
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6
Q

Total # of bones of the skull

A

22 irregular & flattened bones

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

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7
Q

8 Cranial Bones

A
Frontal (1)
Parietal (2, paired)
Occipital (1)
Temporal (2)
Ethmoid (1)
Sphenoid (1)
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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
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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
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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
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11
Q

Temporal bone’s parts

A
  1. Squamous
  2. Petrous
  3. Mastoid
  4. Tympanic
  5. Styloid
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12
Q

Temporal Bone

A

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

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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
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14
Q

Ethmoid Bone is posterior to the

A

lacrimal bone

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15
Q

Ethmoid bone contains

A
  • the horizontal cribriform plate

- olfactory nerve emerges from the nasal cavity through these holes

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16
Q

Olfactory nerve is responsible form our…

A

sense of smell

17
Q

Sphenoid Bone

A

-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

18
Q

Composition of Sphenoid bone

A
  • Central body
  • 2 sinuses
  • 2 greater wings
  • 2 lesser wings
  • 2 Pterygoid processes or plates (medial and lateral)
19
Q

Sphenoid spines

A

at the point where the greater wings join the body

form attachment of the veli palatini muscle of the soft palate

20
Q

Sphenoid bone contains:

A

superior orbital fissure

21
Q

Anterior of sphenoid is…

A

ethmoid bone

22
Q

Sphenoid Bone comprises..

A

orbit of the eye

23
Q

Sphenoid bone foramen

A
  • two that carry CN V (5th cranial nerve)
  • foramen rotundum carries the maxillary branch
  • foramen ovale carries the mandibular branch
24
Q

anterior of the sphenoid body forms…

A

the posterior of the nasal cavity

25
Q

14 Facial Bones:

A
Mandible
Maxillae (2)
Nasal Bones (2)
Palatine bones (2)
Lacrimal bones (2)
Zygomatic bones (2)
Inferior conchae (2) 
Vomer
26
Q

Mandible

A
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
27
Q

Mental proturberance

A

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

28
Q

mental foramen

A

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

29
Q

Inner Surface: Mandible

mental spines located near:

A

symphysis

30
Q

Inner Surface: Mandible:

alveolar arch:

A

the tooth bearing portion of the mandible (upper part)