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Anatomy Decks > Floor of the Skull > Flashcards

Floor of the Skull Flashcards

1
Q

When is the floor of the skull viewed?

A

part of the skull that you view when you remove the skull cap and look into the calvarium.

It is divided into three fossae.

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2
Q

Which bone forms the posterior boundary of the anterior cranial fossa?

A

Lesser wing of sphenoid

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3
Q

Identify the following features in the anterior cranial fossa:

A

Cribiform plate of the ethmod bone

Crista galli in the midline

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4
Q

Which bone forms the anterior boundary of the middle cranial fossa?

A

Greater Wing of Sphenoid

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5
Q

Which bones form the floor of the middle cranial fossa?

A

Sphenoid bone (Body & Greater Wings) & temporal bone (squamous and petrous parts)

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6
Q

Which bone forms the posterior border of the middle cranial fossa?

A

Superior Borders of the petrous part of the temporal bone

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7
Q

Identify the Pterion in the image on the left. Which four bones come together at this H-shaped suture?

A
  • Frontal Bone*
  • Parietal Bone*
  • Sphenoid Bone*
  • Temporal Bone*
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8
Q

Which bone forms the anterior and which the posterior border of the posterior cranial fossa?

A
  • Anterior Dorsum sellae of Sphenoid Bone*
  • Posterior Squamous part of Occipital Bone*
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9
Q

What structures pass through the small foramina of the skull?

A

Emissary veins

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10
Q

What is in the anterior cranial fossa?

A

Formaina of the cribiform plate

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11
Q

What is in the middle cranial fossa?

A

Optic foramen

Superior orbital fissure

Foramen rotundum

Foramen ovale

Foramen spinosum

Foramen laecrum

Carotid canal

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12
Q

What is the posterior cranial fossa?

A

Internal acoustic foramn

Jugular foramen

Hypoglossal foramen

Foramen magnum

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13
Q

What passes through the foramina of the cribifrom plate?

A

CN1- Olfactory nerve

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14
Q

What passes through the foramina of the optic foramen?

A

CN II Optic Nerve, Ophthalmic Artery, Sympathetic N fibres

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15
Q

What passes throgh the superior orbital fissure?

A

CN III Oculomotor Nerve

CN IV Trochlear Nerve

CN V1 Ophthalmic Nerve

CN VI Abducens Nerve

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16
Q

What passes through the foramen rotundum?

A

CN V2 Maxillary Nerve

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17
Q

What passes throguh the foramen ovale?

A

CN V3 Mandibular Nerve

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18
Q

What passes throgh the foramen spinosum?

A

Middle Meningeal Artery & Vein

Meningeal branch of CN V3

19
Q

What passes throguh the foramen laecrum?

A

Closed Cartilage in life

20
Q

What passes through the carotid canal?

A

Internal Carotid Artery & Carotid Plexus

21
Q

What passes throguh the internal acoustic meatus?

A

CN VIII Vestibulocochlear Nerve

CNVII facial nerve

22
Q

What passes throguh the jugular foramen?

A

CN IX Glossopharyngeal Nerve

CN X Vagus Nerve

CN XI Accessory Nerve

23
Q

What passes throguh the hypoglossal foramen?

A

CN XII Hypoglossal Nerve

24
Q

What pases throguh the foramen magnum?

A

Medulla Oblongata, Meninges

25
Q

What are the grooves in the skull formed as?

A

As the bone of the skull develops (and is maintained) around pre-existing blood vessels or nerves.

In the main, the grooves that are easily identified are those formed by arteries or by the intra-cranial venous blood sinuses.

26
Q

The intra-cranial venous blood sinuses are found between what?

A

The inner and outer layers of dura – the inner layer is the dura proper and the outer layer the periosteum of the inside face of the skull bone

27
Q

Identify a groove that begins just lateral to the foramen spinosum. What artery and its branches makes this groove?

A

Middle meningeal artery

28
Q

Identify this artery in the image below- what part of the skull does it cross?

A

Pterion

This is very thin

29
Q

The pterion artery is commoly damaged in injuries. What can this result in?

A

A bleed collecting between the periosteum of the skull and the dura mater (an extradural haemorrhage) as shown in the image to the right.

30
Q

What anatomical factor prevents the collected blood from spreading over a wider area, restricting it to this lens-shaped area in the skull when the pteron artery is damaged?

A

Parietal (periosteal) part of the Dura Mater limits its spread

31
Q

What are the grooves for the intracranial venous sinus called?

A

The transverse sinus

If you trace these laterally until they continue as the S-shaped groove for the sigmoid sinus.

32
Q

Into which foramen does the groove for the sigmoid sinus lead?

A

Jugular foramen

33
Q

Which major vein emerges into the neck from this foramen?

A

Jugular vein

34
Q

What is the sella turcicia?

A

A deep depression in the midline in the middle cranial fossa which houses the pituitary gland.

35
Q

In the body of which cranial bone is the sella turcica found?

A

Sphenoid bone

36
Q
A
37
Q

Which foramen lies immediately anterior to the groove for the cavernous sinus?

A

Carotid sinus

38
Q

What is on either side of the sella turcica?

A

A groove for the cavernous venous

39
Q

What is the groove in the midline of the skull cap made by?

A

Superior saggital sinus

40
Q

What are the pits on either side of the superior saggital sinus?

A

These are for little finger like projections from the arachnoid mater into the superior sagittal sinus which help CSF to be reabsorbed into the systemic circulation.

41
Q
A
42
Q

Which bone are they a part of?

A

Sphenoid

43
Q
  • Name the muscle(s) that attach to:*
  • Medial pterygoid plate*
  • Lateral pterygoid plate*
A
  • Medial pterygoid plate- Superior pharyngeal constrictor*
  • Lateral pterygoid plate- Lateral and medial pterygoid muscles*
44
Q
A

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