Skull

Question 1

How bones in the skull?

Describe the differences in the development of bones of the Neurocranium.

Answer 1

22

Neurocranium

• Calvaria - intramembranous
• Base - endochondrial

Question 2

What is a fontanelle?

What are their function?

When do Anterior and posterior ones fuse?

What is early fusion called?

Palpating of the anterior fontanelle can be used to asses what 2 things?

Answer 2

Large areas of unossified membranous gaps between flat bones of the calavaria

Allow for change in skull size and shape during childbirth
Allow for growth of brain

Anterior - 18months-2 years
Posterior - 1-3 months

Craniosyntosis

ICP and hydration state of baby

Question 3

What 3 bones of the skull are most commonly fractured?

Answer 3

Nasal
Zygomatic
Mandible

Question 4

Describe the difference in vascularity between arachnoid and pia.

Answer 4

Arachnoid = avascular

Pia - highly vascular

Question 5

Where does the straight sinus run?

Answer 5

Junction between falx cerebri and tentorium cerebelli

Question 6

What are the attachments for the tentorium cerebelli?

What sinuses run through it?

Answer 6

Transverse sulcus, petrous temporal bone and posterior clinoid processes

Transverse
Superior petrosal

Question 7

What do bridging veins connect?

What can trauma of them lead to?

Answer 7

Cerebral veins to Dural Venous sinuses

Sub dural haemorrhage