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ccs3 week 3 > Bones of the Cranium & Orbit > Flashcards

Bones of the Cranium & Orbit Flashcards

1
Q

Cranium

What are the parietal (2) bones?

A

They form roof and sides of cranium

They articulate with each other at the midline

They articulate with the frontal bone anteriorly and the occipital bone posteriorly

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2
Q

Cranium

What is the occipital bone?

A

Forms the posterior aspect of the skull and the posterior floor of the orbital cavity

They articulate with temporal, parietal and sphenoid bones

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3
Q

Cranium

What are the temporal bones?

A

Forms the side of the cranium (squamous portion)

Houses middle/inner ear structures

Articulates with the parietal, sphenoid bones, occipital and zygomatic bone

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4
Q

Cranium

What is the frontal bone?

A

Forms the anterior portion of the cranium and anterior floor of orbital cavity

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5
Q

Cranium

What is the sphenoid bone?

A

Forms the base of the cranium and lateral walls of the orbital cavity

It is composed of the body, lesser wings and greater wings

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6
Q

What structures are involved in the sphenoid bone?

A

Sphenoid body - Hypophyseal fossa (Pituitary gland)

Gap between the lesser wing and sphenoid body - optic canal (optic nerve exits orbit)

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7
Q

What is the supraorbital margin?

A

Where the frontal bone sits

It allows passage of the supraorbital neurovascular bundle

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8
Q

What is the infraorbital margin?

A

contains the zygomatic bone (laterally)
maxillary bone (medially)

has the infraorbital foramen

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9
Q

What is found in the lateral (temporal) margin?

A

Frontal bone - zygomatic process
Zygomatic bone - frontal process

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10
Q

What is the optic canal?

A

It is found within the lesser wing of the sphenoid
It is also where the optic nerve exits and ophthalmic artery enters

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11
Q

What is the superior orbital fissure?

A

gap between lesser and greater wings of the sphenoid

Transmits most other vascular and neural structures into the orbit

Attachment point for LR

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12
Q

What is the inferior superior orbital fissure?

A

Greater wing of the sphenoid and maxilla
It is a passage between the orbit and the emporak fossae

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13
Q

What are paranasal sinuses?

A

Cavities within the bone of the face
- filled with air
- lighten the skull
- help voice resonate
- drain mucus secretions

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14
Q

What is the superior sinus?

A

Known as the frontal sinus

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15
Q

What is the inferior sinus?

A

Known as the maxillary sinus

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16
Q

What are medial sinuses?

A

Also known as sphenoid sinus and ethmoid sinus

17
Q

What is the cavernous sinus?

A

Lies between the layers either side of the sella turcica

18
Q

What does the cavernous sinus connect to?

A
  • Superior ophthalmic veins
  • Pterygoid plexus
  • Sphenoparietal sinus
  • Petrosal sinus
  • Basilar sinus
19
Q

What are the conduits of cavernous sinuses?

A

Internal carotid artery
oculomotor, trochlear, trigeminal and abducens nerves

ccs3 week 3 (4 decks)

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