Cranial Nerves 2 Flashcards

1
Q

What are the cranial nerves of the medulla?

A

Glossopharyngeal
Vagus
Accessory
Hypoglossal

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2
Q

Describe the glossopharyngeal nerve

A

Mixed
Leaves the skull via the jugular foramen
SVA
GVA
GSA
SVE
GVE

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3
Q

Describe the SVA of the glossopharyngeal nerve

A

Taste from the post 1/3 of the tongue
Inferior ganglion

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4
Q

Describe the GVA of the glossopharyngeal nerve

A

Sensation from
post 1/3 of the tongue
Pharynx
Carotid sinus
(Inferior ganglion)

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5
Q

Describe the GSA of the glossopharyngeal nerve

A

Sensation from external
Superior ganglion
Enters the spinal trigeminal tract

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6
Q

Describe the SVE of the glossopharyngeal nerve

A

Branchial motor
Motor innervation to stylopharyngeus muscle from the nucleus ambiguus of medulla

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7
Q

Describe the GVE of the glossopharyngeal nerve

A

Parasympathetic innervation of parotid gland from inferior salvilatory nucleus of medulla

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8
Q

Describe the vagus nerve

A

Mixed nerve
Most extensive distribution
Extends throughout the neck, thorax and abdomen (colon)

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9
Q

Describe the SVA of the vagus nerve

A

Taste from epiglottis to solitary nucleus
(Inferior ganglion)

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10
Q

Describe the GVA of the vagus nerve

A

Sensation from
Abdominal organs
Heart / lungs
Pharynx , larynx
Oesophagus , trachea
Inputs from chemoreceptors in carotid body to monitor CO2
This goes to the cardio respiratory portion of the nucleus of the solitary tract

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11
Q

Describe the GSA of the vagus nerve

A

General sensation from
Pharynx , larynx
Oesophagus , trachea
External ear , external acoustic meatus
(Superior ganglion)
Nucleus spinal trigeminal tract

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12
Q

Describe the SVE of the vagus nerve

A

Branchial motor
Motor innervation to all pharyngeal and laryngeal muscles
(Not stylopharyngeus or tensor veli palatini)
From nucleus ambiguus medulla

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13
Q

Describe the GVE of the vagus nerve

A

Parasympathetic innervation from the dorsal motor nucleus to thoracic and abdominal viscera
Influenced by
Hypothalamus
Olfactory system
Reticular formation and
NTS
Dorsal nucleus located on vagal trione

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14
Q

Describe the accessory nerve

A

Motor
Arises from spinal accessory nucleus in posterolateral ventral horn of cervical spinal cord
Emerges from the spinal cord in lateral funiculus
Ascends to enter foramen magnum

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15
Q

Describe the SVE of the accessory nerve

A

Innervation to the sternocleidomastoid, trapezius and intrinsic laryngeal muscles

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16
Q

Describe the Hypoglossal nerve

A

Motor
Cell bodies located in the Hypoglossal nucleus of the medulla

17
Q

Describe the GSE of the Hypoglossal nerve

A

Innervation to extrinsic muscles (except palatoglossus) and intrinsic muscles of the ipsilateral side of the tongue