Skull Anatomy Flashcards
How many separate bones is the skull made up of?
22
What are the 2 groups of bones that the skull is divided into?
Cranial bones and facial bones
How many cranial bones are there?
8
How many facial bones are there?
14
The cranium is divided into what 2 groups of bones
Skull cap/calvarium and cranial floor
What are the bones of the cranium?
Frontal, ethmoid, sphenoid, occipital, 2 parietal, and 2 temporal
Sutures
Fibrous joints that connect the bones of the skull
4 sutures of the skull
Coronal, sagittal, lambdoidal, and squamosal
Coronal suture
Between parietal and frontal bones
Sagittal suture
Between 2 parietal bones
Squamosal suture
Between parietal and temporal bones
Lambdoidal suture
Between occipital and parietal bones
Bregma
Anterior end of the sagittal suture; junction of coronal and sagittal suture
Lambda
Posterior end of sagittal suture; junction of sagittal and lambdoidal suture
Fontanels
Area of incomplete ossification in infant skulls (soft spots)
What age do the fontanels close by?
18 months
What do the fontanels become?
The bregma and lambda
What age is the adult cranial size achieved by?
12 years
Skull cap/calverium bones
Frontal, occipital, and 2 parietal bones
Cranial floor bones
2 temporal, sphenoid, and ethmoid bones
Glabella
Between eyebrows
Interpupillary line
Imaginary horizontal line between the center of the pupil of the eye
Inner canthus
Inner corner of the eye
Outer canthus
Outer corner of the eye
