Overview of Skull and Meninges

Question 1

Falx cerebri

Answer 1

CT layer that separates the 2 hemispheres

Question 2

Tentorium cerebelli

Answer 2

CT layer that separates the cerebellum from the cortex

Question 3

What does the external carotid supply?

Answer 3

Everything outside the skull

Middle meningeal artery

Question 4

What does the internal carotid supply?

Answer 4

Everything inside the skull

Question 5

Where do the vertebral arteries branch from?

Answer 5

Subclavian arteries

Question 6

5 layers of the scalp

Answer 6

Skin
Connective tissue
Aponeurotic layer
Loose CT
Periosteum

Question 7

Where are the neurovascular structures found in the scalp?

Answer 7

The dense CT layer

Question 8

Periosteum

Answer 8

Last layer of the scalp
Stays attached to the bone
Osteogenic (bone forming)

Question 9

What is the “danger area”

Answer 9

The loose CT layer of the scalp
Where scalping injuries occur
Spread of infection and hemorrhage
The neurovascular structures of the scalp are getting ripped off

Question 10

The skull bone consists of what 3 parts?

Answer 10

Outer table (dense)
Diploe (medullary bone)
Inner table (dense)

Question 11

What are the 2 layers of the dura?

Answer 11

Periosteal layer

Meningeal layer

Question 12

Where are the venous sinuses found?

Answer 12

Between the periosteal and meningeal layers of the dura

Question 13

Middle meningeal artery

Answer 13

Branch of external carotid artery
Found in the bone forming layer of the skull
If you damage it, blood will collect between the dura and bone, resulting in an epidural hematoma

Question 14

What vessels are ruptured to get a
1. Epidural
2. Subdural
hematoma?

Answer 14

1. Middle meningeal artery

2. Bridging veins

Question 15

Emissary veins

Answer 15

Connect intercranial and extracranial veins
No valves
Infection can spread :(

Question 16

Where does the innervation of the head switch from trigeminal nerve to cervical nerves?

Answer 16

At the vertex (top of the head)