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Anatomy > Clinical anatomy of interior skull > Flashcards

Clinical anatomy of interior skull Flashcards

1
Q

Where is an area of bone weakness on the skull due to thin bone?

A

Pterion

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2
Q

Which borns join to form pterion?

A

Frontal, temporal, parietal, sphenoid

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3
Q

Where are areas of weakness on the skull due to openings?

A

Nasal apertures and orbit

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4
Q

Why does the structure of sutures make them immovable?

A

Joined by very strong collagen fibres

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5
Q

How does interdigitation make sutures stronger?

A

Increases SA of contact

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6
Q

What is bevelling and what is the effect of bevelling on sutures?

A

Overlapping of bone, makes the suture stronger

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7
Q

What is buttressing?

A

Thickened areas of bone that support fragile zones like the nasal cavity and orbit

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8
Q

Buttressing of the skull is in line with forces of mastication, why is this?

A

Dissipate forces of mastication so maxillary teeth don’t get forced into maxillary sinus

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9
Q

Name the buttresses on the anterior surface of face?

A

Supracilary bar, lower orbital margin, canine buttress, maxilla-zygomatic buttress

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10
Q

What type of forces does the buttressing not he anterior surface fo the face not resist?

A

Anterior

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11
Q

What buttressing does resist anterior forces?

A

Tuberosity pterygoid buttress

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12
Q

How do the dural reflections have a protective role?

A

Transmit weight to skull and absorb energy of impact

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13
Q

What allows the dural reflections to absorb energy of impact?

A

They are incompressible and flexible

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14
Q

Through what fo. do the venous sinuses drain blood?

A

Jugular fo.

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15
Q

What are the 3 protective roles of venous insulin drainage?

A

Drain 70% of blood through jugular fo.
Cooling mechanism
Protect abasing changes in BP by moving blood to emissary veins

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16
Q

What is the extradural space?

A

Between duramater and skull

17
Q

What occurs during an extradural haemorrhage?

A

Blood strips dura away from skull and presses against brain

18
Q

What artery does an extradural haemorrhage effect?

A

Middle meningeal

19
Q

During a subdural haemorrhage where does blood drain into?

A

Superior cerebral vein

20
Q

What is the subarachnoid space normally filled with?

A

CSF

21
Q

What are the routes of infection spread?

A

Tissue plane, venous, lymphatics, direct erosion

22
Q

If an infection is untreated it can?

A

Cause airway obstruction
Spread into brain
Cause septicaemia

23
Q

What is the line of least erosion?

A

Spread through the tissue before thick - may spread in an unexpected way

24
Q

During a periodical abbess the route of infection is determined by line of least residence, this changes in individuals deepening on the thickness of which bone?

A

Alveolar bone

25
Q

Name the tissue spaces of the lower jaw

A 
Sublingual
Submandibular
Submental
Pteyrgomandibular
Peritonsillar
Retropharyngeal
26
Q

Name the tissue spaces of the upper jaw

A

Parotid
Canine
Palatal
Infratemporal

27
Q

If an infection spreads intraorally, which tissue plane does it infect?

A

Sublingual

28
Q

If an infection spreads extra orally which tissue plane doe sit infect?

A

Submandibular

29
Q

If an infection spreads to the neck which space does it infect?

A

Retropharyngeal

30
Q

Paranasal sinuses are in direct contact with bone, how can infection spread from here?

A

Rapid erosion

31
Q

Ludwigs angina can occur after a tooth infection. What is it?

A

Infection spread backwards towards posterior border of mylohyoid and infects mylohyoid, causes growth an pushes tongue pack to block airway

32
Q

Why is cavernous sinus thrombosis an issue?

A

Cavernous sinus is deep seated so antibiotics cannot reach

33
Q

Cavernous sinus thrombosis blocks what artery?

A

Internal carotid

Anatomy (40 decks)

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