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Flashcards in The Middle Cranial Fossa Deck (20):
1

What are the different modalities of the cranial nerves

Somatic sensory (sensory info from the body wall to the brain)
Somatic motor ( from cns to skeletal muscle)
Parasympathetic motor
Special sensory
Mixed
Visceral sensory

2

Explain what is meant by somatic sensory and motor nerve s

Sensory - from skin etc to CNS, mental nerve
Motor – to skeletal muscle form CNS, spinal accessory

3

Explain what is meant by the parasympathetic nerves and special sensory

Parasymp motor - rest and digest, glands get secretomotor innervation
Special sensory - from sense organ, optic nerve

4

Explain what a mixed nerve is nd what a visceral sensory nerve I

Mixed - mix of a few modalities, trigeminal
Visceral sensory - from carotid body, Glossopharyngeal

5

What are the cranial nerves

Olfactory
Optic
Oculomotor
Trochlear
Trigeminal
Abducens
Facial
Vestibulocochlear
Glossopharyngeal
Vagus
Spinal accessory
Hypoglossal

6

What are the modalities of the cranial nerves

Some say marry money my brother says big brains matter more

7

Explain some features of the olfactory nerve

Special sensory
Smell
Olfactory receptors in the crubiform plate
Olfactory tract and bulb

8

Explain some feature of the optic nerve

Special sensory
Sight
Passes through optic canal thro the formina
Optic nerves meet at chiasms and cross over

9

What are the two main structures of the eye

Pupil - hole the centre where light passes through
Iris coloured part
associciated circular smooth muscle sphincter pupillae
And radial is dilator pupillae

10

What causes the pupil to constrict

Parasympathetics
Oculomotor nerve reached to eye

11

What causes the pupil to dilate

Sympathetics
Reach the orbit following arteries

12

How do u clinically test the optic nerve

Flashing light in eyes
See pupillary light reflex
Both eyes hold constrict
Sensory is from optic nerve
Moto pr is from oculomotor

13

Describe some features of the oculomotor nerve

Mixed
Somatic motor - muscles of eye in orbit extra ocular
Parasympathetic - sphincter pupillae muscle

14

What does the trochlear nerve suppl

One extra ocular muscle = superior oblique muscle
Very delicate
Only cranial nerve that emerges form midbrain
Called trochlear as Ct tubing where muscle is called trochlea

15

What does the abducens nerve supply

Somatic motor
Of one extra ocular eyes the lateral rectus muscle which helps abduct the eye
Leaves the brain from the junction between the pons and medulla

16

What does the trigeminal nerve innervate

Mixed
Somatic motor - root shoes rate joins with sensory part of Vc at foramen ovale
Sensory - Va sensory to upper face, Vb sensory to mid face
Vc - mixed as has sensory to lower face and motor for muscles of mastication

17

What are all the foraminae that the cranial nerves exit out of

Olfactory- crubiform
Optic - optic canal
Oculomotor - superior orbital fissure
Trochlear - superior orbital fissure
Trigeminal - Va and Vb (foramen rotundum) Vc (foramen ovale)
Abducens - superior orbital fissure
Facial - internal acoustic meatus
Vestibulocochlear - internal acoustic meatus
Glossopharyngeal - jugular foramen
Vagus - hypoglossal canal
Spinal accessory - spine
Hypoglossal - hypoglossal canal

18

What nerves pass thought the lateral walls of the cavernous sinus

Oculomotor, trochlear and the Opthalmic and maxillary divisions of the trigeminal nerve

19

What things pass through the actual cavernous sinus

Internal carotid artery
Abducens
(Submerged in venous blood)

20

What are the subdivisions of the cranial fossa

Anterior - frontal, ethmoid, sphenoid

Middle - sphenoid and temporal

Posterior - temporal and occipital