Chapter 7: The Skull Flashcards
How many bones does the skull have?
22
How many cranial bones are there
8
What are the cranial bones?
-frontal
- parietal(2)
- temporal (2)
- occipital
- sphenoid
- ethmoid
How many facial bones are there?
14
What are the facial bones
- zygomatic bones (2)
- lacrimal (2)
- nasal(2)
- vomer
- inferior nasal conchae (2)
- palatine (2)
- maxillae (2)
- mandible
Orbital cavity
Eye socket
Oral cavity
Mouth
Nasal cavity
Nose
Paranasal sinuses
Functions:
- lighten skulls mass
- increase surface area of nasal mucosa to most in and cleanse inhaled air
- serve as (echo) resonating chambers that intensify and prolong sounds
Suture
Immovable fibrous joint in an adult skull
Coronal suture
Untuned the frontal and parietal bones
Sagittarius suture
Unites the two parietal bones
Squamous suture
Unite the parietal and temporal bones
Lambdoid suture
Unites the two parietal bones to the occipital bone
What are Fontanells
Soft spots
- areas of cartilage and unossified mesenchyme that are arranged in thin plates around the developing brain
Fontanels functions
- flexibility to the fetal skull
- allow skull to change shape through the birth canal
- permit rapid growth of the brain
Where is the frontal bone located
- forms the anterior roof of the cranium ( forehead) , nasal cavity, and orbital arches
Important features of frontal bone
- squamous part
- glabella
- siperciliary arches
- supraorbital margin
- zygomatic process
- frontal crest
- suborbital foramen
- frontal sinuses
Frontal crest
Attachment site for meninigies to help stabilize the brain within the skull
Is the frontal bone paired or unpaired?
Unpaired
Frontal sinuses
lighten bone, moisten inhaled air, and give resonance to voice
Orbital part
Forms roof of the orbit
Squamous part
Attachment of scalp muscles
Supraobital
Forms the protective superior border of orbit