Nerves Flashcards

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0
Q

Symptoms of Bell’s Palsy

A
Facial paralysis
Smoothing of facial wrinkles
Drooling
Inability to completely close eye
Dry eye
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1
Q

What is Bell’s Palsy?

A

Temporary paralysis of CN VII due to swelling of the nerve in the facial canal of the temporal bone

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2
Q

What does the central nervous system consist of?

A

The brain and the spinal cord

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3
Q

What does the peripheral nervous system consist of?

A

Cranial and spinal nerves

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4
Q

What is CN I and where does it exit the cranial cavity?

A

The olfactory nerve

At the cribriform plate

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5
Q

What is CN II and where does it exit the cranial cavity?

A

The optic nerve

Optic canal

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6
Q

What is CN III and where does it exit the cranial cavity?

A

The oculomotor nerve

Superior orbital fissure

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7
Q

What is CN IV and where does it exit the cranial cavity?

A

The trochlear nerve

Superior orbital fissure

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8
Q

What is CN V and where does it exit the cranial cavity?

A

The trigeminal nerve
V1: superior orbital fissure
V2: foramen rotundum
V3: foramen ovale

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9
Q

What is CN VI and where does it exit the cranial cavity?

A

The abducens nerve

The superior orbital fissure

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10
Q

What is CN VII and where does it exit the cranial cavity?

A

Internal acoustic meatus

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11
Q

What is CN VIII and where does it exit the cranial cavity?

A

Vestibulocochlear nerve

Internal acoustic meatus

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12
Q

What is CN IX and where does it exit the cranial cavity?

A

Glossopharyngeal nerve

The jugular foramen

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13
Q

What is CN X and where does it exit the cranial cavity?

A

The vagus nerve

Jugular foramen

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14
Q

What is CN XI and where does it exit the cranial cavity?

A

The spinal accessory nerve

Jugular foramen

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15
Q

What is CN XII and where does it exit the cranial cavity?

A

The hypoglossal nerve

Hypoglossal canal

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16
Q

What type of fibers carry motor information away from the CNS?

A

Efferent fibers

17
Q

What type of fibers carry sensory information toward the CNS?

A

Afferent fibers

18
Q

What is the visceral efferent system also know as and what two systems is it divided into?

A

The autonomic system which is divided into sympathetic and parasympathetic systems

19
Q

What type of tissue is innervated by general somatic efferent nerve fibers?

A

Skeletal muscle

20
Q

What type of tissues are innervated by General somatic afferent nerve fibers?

A

Conscious sensation from skin

Skeletal muscle

21
Q

What type of tissue is innervated by General visceral efferent nerve fibers?

A

Smooth muscle

Glands

22
Q

What types of tissues are innervated by General visceral afferent nerve fibers?

A

Unconscious sensation from viscera and blood vessels

23
Q

What type of tissues are innervated by special afferent nerve fibers?

A
Vision
Hearing
Balance
Taste
Smell
24
Q

What types of actions does the sympathetic nervous system control?

A

Constriction of blood vessels
Secretion of sweat
Dilation of pupils

25
Q

What type of bodily functions does the parasympathetic system control?

A

Dilation of blood vessels
Secretion of tears
Secretion of mucus
Constriction of pupils

26
Q

What are the special afferent CN’s?

A

Olfactory

Optic vestibulocochlear

27
Q

What are the general efferent only CN’s?

A

Trochlear
Abducens
Spinal accessory
Hypoglossal

28
Q

What do lesions of general efferent nerves cause?

A

Motor deficits only

29
Q

What does injury to the cribriform plate or a congenital defect of CN 1 cause?

A

Loss of smell (anosmia)

30
Q

What ganglia do each branch of CN V suspend?

A

V1: ciliary ganglion
V2: pterygopalatine ganglion
V3: submandibular/otic ganglion

31
Q

What does an orbital trauma or a disruption of the optic pathway cause? (CN II)

A

Blindness, visual field anomalies

32
Q

What does an aneurism, cavernous sinus mass or thrombosis result in near CN III?

A

Dilated pupil
Loss of pupil reflexes
Eye is down and out
Ptosis

33
Q

What happens when there is a mass near the trigeminal ganglion or around the foramen a where any of the CN V divisions pass?

A

Loss of facial sensation
Loss of mm of mastication function
Loss of corneal touch reflex and sneezing reflex

34
Q

What does an orbital fracture do to CN IV?

A

Unable to look inferior my when eye is adducted

Head tilt

35
Q

What happens where there is a brain or cavernous sinus lesion of CN VI?

A

Unable to abduct eye

Eye turn medially

36
Q

What happens if there is damage to branches in the parotid, a temporal bone injury or inflammation near CN VII?

A

Paralysis of facial mm
Abnormal taste from ant 2/3 of tongue
Dry eye

37
Q

What happens if there is a tumor at CN VIII?

A

Hearing loss

Tinnitus

38
Q

What happens if there is a penetrating neck injury or brainstem lesion at CN X?

A

Deviation of uvula to normal side
Vocal cord paralysis
Dysphasia

39
Q

What happens if there is a penetrating neck injury or brainstem lesion at CN IX?

A

Loss of Taste from post 1/3 of tongue and gag reflex

40
Q

What happens if there is a penetrating neck injury at CN XI?

A

Paralysis of scm and trapezius mm

41
Q

What happens if there is a penetrating neck injury at CN XII or a skull base pathology?

A

Atrophy of tongue mm and deviation towards affected side

Speech disturbance