Lecturio 4 Development of skull Flashcards
What does Neurocranium contain?
Skull base and calvarium, which contains the brain
What does Viscerocranium contain?
Bones and cartilages of the face and neck
Bones of the skull base form from a series of cartilages which are ____
What are the Two methods of ossification contribute to the formation of the skull?
- Endochondral ossification
- Intramembranous ossification
Endochondral Ossification of the Skull
Base of the skull _____
_____ grow inferiorly and enlarge via endochondral ossification.
- elongates
- Facial bones
Endochondral Ossification of the Skull
____ elongates
Facial bones grow inferiorly and enlarge via endochondral ossification.
Base of the skull
Endochondral Ossification of the Skull
- Continuing growth of the skull; elongates off of the face with age
- Elongation of the face as we age
- (1)____ elongates, the face grows larger; relative size of the forehead to the face (2)____ (increases/decreases)
- The jaw
- decreases
In calvarium, mesenchyme forms models of (1)____
→ Ossifying via (2)___
- flat bones of the skull
- intramembranous ossification
Intramembranous Ossification of the Skull
(1)___ expand radially from each intramembranous ossification center
They approach neighbors; (2)____ and ____ regulate their interaction and prevent them from fusing
- Bony spicules
- dura mater and periosteum
Intramembranous Ossification of the Skull
→ identify
Intramembranous Ossification of the Skull
→ Identify
Development of Sutures and Fontanelles
Sutures and fontanelles develop between ___ and ___
→ Instead of fusing, these borders are made of ___
- developing flat bones
- connective tissue
Development of Sutures and Fontanelles
→ Identify
Development of Sutures and Fontanelles
→ Identify
Development of Sutures and Fontanelles
____ separating right and left frontal bones
_____ at conjunction of coronal and sagittal sutures
- Frontal (metopic) suture
- Large anterior fontanelle
Development of Sutures and Fontanelles
_____: at conjunction of coronal and squamosal sutures
___: at conjunction of lambdoid and squamosal sutures
- Anterolateral fontanelle
- Posterolateral fontanelle
Development of Sutures and Fontanelles
Anterolateral fontanelle: at conjunction of _____
Posterolateral fontanelle: at conjunction of ___
- coronal and squamosal sutures
- lambdoid and squamosal sutures
Development of Sutures and Fontanelles
→ IDENTIFY
Development of Sutures and Fontanelles
Squamosal suture separating parietal and temporal bones
Much smaller ____ → at conjunction of lambdoid and sagittal sutures
posterior fontanelle
Development of Sutures and Fontanelles
→ identify
Squamosal suture separating parietal and temporal bones
