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Z-Anatomy > Cranial fossae > Flashcards

Cranial fossae Flashcards

1
Q

What are the 3 types of cranial fossae and what bones make up their floors?

A

Anterior- frontal, ethmoid, sphenoid
middle- sphenoid and temporal
posterior-temporal and occipital

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2
Q

What fibres make up CN I (olfactory) and what foramen does it pass through?

A
  • Special sensory

- cribiform plate

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3
Q

What fibres make up CN II (Optic) and what foramen does it pass through?

A
  • special sensory

- optic canal

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4
Q

What fibres make up CN III (oculomotor) and what foramen does it pass through?

A
  • MIXED- somatic motor and parasympathetic

- superior orbital fissure

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5
Q

What fibres make up CN IV (trochlear) and what foramen does it pass through?

A
  • Somatic motor

- superior orbital fissure

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6
Q

What fibres make up CN V (trigeminal) and what foramen does it pass through?

A
  • MIXED- somatic motor and somatic sensory
  • Va- superior orbital fissure
  • Vb- retundum
  • Vc- ovale
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7
Q

What fibres make up CN VI (abducent) and what foramen does it pass through?

A
  • somatic motor

- superior orbital fissure

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8
Q

What fibres make up CN VII (facial) and what foramen does it pass through?

A
  • MIXED- somatic motor, somatic sensory, special sensory, parasympathetic
  • internal acoustic meatus
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9
Q

What fibres make up CN VIII (vestibulochlear) and what foramen does it pass through?

A
  • special sensory

- internal acoustic meatus

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10
Q

What fibres make up CN IX (glossopharyngeal) and what foramen does it pass through?

A
  • MIXED- somatic motor, somatic sensory, special sensory, parasympathetic
  • jugular foreman
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11
Q

What fibres make up CN X (vagus) and what foramen does it pass through?

A
  • MIXED- somatic motor, somatic sensory, special sensory, parasympathetic
  • jugular foramen
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12
Q

What fibres make up CN XI (spinal accessory) and what foramen does it pass through?

A
  • somatic motor

- jugular foreman

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13
Q

What fibres make up CN XII (hypoglossal) and what foramen does it pass through?

A
  • somatic motor

- hypoglossal canal

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14
Q

Describe the anatomy of CN I

A
  • special sensory (sense of smell)
  • origin- forebrain (cerebral hemispheres
  • pass through cribriform plate
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15
Q

Describe the anatomy of CN II

A

-Special sensory ( sense of sight)
-origin- forebrain (diencephelon)
- 2 visual fields :
temporal and nasal
-where two optic nerves cross over is called optic chiasm

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16
Q

What are the 2 types of muscles in the iris?

A
  • circular smooth muscle called sphincter papillae

- radial smooth muscle called dilator pupillae

17
Q

How can CN II be clinically tested?

A
  • pupillary light reflex
  • tests sensory and motor function of eye
  • dual response due to cross over at chiasma
18
Q

Describe the anatomy of CN III

A
  • origin - midbrain
  • somatic motor to 4 skeletal ocular muscles and levator palpebral superioris
  • parasympatheic to sphinctor pupillae
19
Q

Describe the anatomy of CN IV

A
  • origin- posterior aspect of midbrain

- somatic motor- superior oblique muscle

20
Q

Describe the anatomy of CN VI

A
  • origin- junction between pons and medualla

- somatic motor- lateral muscle

21
Q

Describe the anatomy of CN V

A
  • Va- sensory to upper face
  • Vb- sensory to skin of midface
  • Vc- sensory to most of lower face and motor to muscles of mastication , anterior belly of digastric, mylohyoid and 2 tensors
22
Q

Where do all 3 sensory fibres from Va,b and c join together?

A

Trigeminal sensor ganglion

23
Q

Where does the motor root of CN V lie and what foreman does it pass through?

A

Beneath the sensory ganglion and passes through foreman oval alongside sensory Vc

24
Q

What foramen does the middle menial artery pass through

A

spinosum

25
Q

How is the cavernous sinus formed?

A

When two layers of dura separate

26
Q

What runs through the cavernous sinus?

A

internal carotid artery and CN VI

27
Q

What runs through the dura?

A

CN III, IV, Va and Vb

28
Q

Where do the greater and lesser petrosal nerves run?

A

Greater- behind Vc nerve

lesser- exit skull through foreman oval along with mandibular division of trigeminal nerve

29
Q

Describe the motor innervation of the parotid gland in reference to pre and post ganglion fibres

A

Coming from glossopharyngeal nerve found in the tympanic plexus, into lesser petrosal branch that reaches the synapse of the otic ganglion. The post ganglionic parasympathetic travels in auriculotemporal nerve and is delivered to the the parotid gland

Z-Anatomy (25 decks)

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