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Gross Anatomy > Head: Internal Skull > Flashcards

Head: Internal Skull Flashcards

1
Q

Anterior Cranial Fossa

A
  • Frontal lobes sit here
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2
Q

Anterior Cranial Fossa is formed by

A
  • Frontal bone
  • Ethmoid bone
  • Sphenoid bone
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3
Q

Orbital Plate of Frontal Bone

A
  • Forms the roof of the orbit
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4
Q

Ethmoid Bone structures

A
  • Cribiform plate

- Crista galli

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5
Q

Sphenoid Bone structures

A
  • Body and lesser wings

- Anterior clinoid process

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6
Q

Crista Galli

A
  • Attachment of cranial dura mater (falx cerebri)
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7
Q

Openings of the Anterior Cranial Fossa

A
  • Foramina of cribriform plate

- Foramen cecum

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8
Q

Foramina of Cribriform Plate

A
  • Passage of bipolar neurons of olfactory nerve (CN I)
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9
Q

Foramen Cecum

A
  • Emissary vein from nasal cavity draining to cranial sinuses (not always present)
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10
Q

Middle Cranial Fossa

A
  • Temporal lobes of the brain are found here
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11
Q

Middle Cranial Fossa formed by

A
  • Temporal bone
  • Sphenoid bone
  • Sella turcica
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12
Q

Posterior boundary of Middle Cranial Fossa

A
  • Crest of the petrous ridge (temporal bone)

- Dorsum sellae

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13
Q

Sella Turcica contains

A
  • Tuberculum sellae
  • Hypophyseal fossa: houses pituitary gland
  • Dorsum sellae
  • Posterior clinoid process: dural attachment
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14
Q

Hypophyseal Fossa

A
  • Houses pituitary gland
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15
Q

Posterior Clinoid Process

A
  • Dural attachment
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16
Q

Openings in Middle Cranial Fossa

A
  • Superior orbital fissure
  • Foramen rotundum
  • Foramen ovale
  • Foramen spinosum
  • opening for carotid canal
  • Foramen lacerum
  • Optic canal
  • Groove for greater petrosal nerve
  • Groove for lesser petrosal nerve
17
Q

Superior Orbital Fissure

A
  • Communicates with orbit
18
Q

Foramen Rotundum

A
  • Communicates with pterygopalatine fossa
19
Q

Foramen Ovale

A
  • Communicates with infratemporal fossa
20
Q

Foramen Spinosum

A
  • Communicates with infratemporal fossa
21
Q

Foramen Lacerum

A
  • Typically closed by cartilage
  • Small meningeal vessels pass through
  • Internal carotid and some nerves pass horizontally across
22
Q

Optic Canal

A
  • Communicates with orbit
23
Q

Posterior Cranial Fossa

A
  • Deepest cranial fossa

- Houses the cerebellum, pons, and medulla

24
Q

Posterior Cranial Fossa Contains

A
  • Dorsum sellae
  • Crest of petrous ridge separate from middle cranial fossa
  • Clivus
  • Internal occipital protuberance
  • Internal occipital crestgroove for transverse and sigmoid sinuses
25
Q

Openings in Posterior Cranial Fossa

A
  • Foramen magnum
  • Hypoglossal canal
  • Jugular foramen
  • Internal acoustic meatus

Gross Anatomy (50 decks)

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