The Cranium - Regions and Connections

Question 1

The “vault” bones develop via ______________ ossification.

Answer 1

INTRAMEMBRANOUS

Question 2

Are the “vault” bones fused at birth?

Answer 2

NO

“base” bones are more solid

Question 3

Name the “vault” bones?

Answer 3

FRONTAL
\+
PARIETAL
\+
TEMPORAL SQUAMA
\+
GREATER WINGS OF SPHENOID
\+
OCCIPITAL SQUAMA

Question 4

Name the 2 different types of skull sutures?

Answer 4

BEVEL (OVERLAPPING) TYPE
(temporoparietal suture - temporal: facing in (Internal bevel), parietal; facing out (External bevel)
\+
INTERDIGITATING (SERRATE) TYPE
(saggital suture)

Question 5

Name the 5 important sutures?

Answer 5

FRONTAL
\+
SAGGITAL
\+
LAMBDOID
\+
TEMPOROPARIETAL
\+
OCCIPITOMASTOID

Question 6

The “base” bones develop via ______________ ossification.

Answer 6

ENDOCHONDRAL

Question 7

Name the 5 structures which make up the “base” bones?

Answer 7

SPHENOID - EXCLUDING GREATER WINGS
\+
OCCIPUT - EXCLUDING SQUAMA
\+
ETHMOID - UPPER PART
\+
TEMPORAL, PETROUS + MASTOID PORTIONS
\+
FRONTAL, ROOF OF ORBIT + FRONTAL PLATE

Question 8

What do the base bones provide structural support for?

2

Answer 8

CRANIUM
+
CERVICAL SPINE

Question 9

Name the 4 important sutural junctions of the skull?

and when they close?

Answer 9

BREGMA - closes 12 - 14 months
\+
LAMBDA - closes 4 months
\+
ASTERION - closes 12 months
\+
PTERION - closes 4 - 6 months

Question 10

What makes up the Bregma?

Answer 10

ANTERIOR FONTANELLE
+
PARIETAL, FRONTAL

Question 11

What makes up the Lambda?

Answer 11

POSTERIOR FONTANELLE
+
PARIETAL, OCCIPITAL

Question 12

What makes up the Asterion?

Answer 12

MASTOID FONTANELLE
+
PARIETAL, OCCIPITAL, TEMPORAL

Question 13

What makes up the Pterion?

Answer 13

SPHENOIDAL FONTANELLE
+
PARIETAL, FRONTAL, TEMPORAL, SPHENOID