LAST 4 CRANIAL NERVES(Page 92)

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Deep Origin (Nuclei) of Last 4 cranial nerves

9th C.N.

10th C.N. 11th C.N. 12th C.N.

Motor -Nucleus Ambiguus Hypo-glossal nucleus

Sensory Spinal nucleus of trigeminal nerve

No No

Taste Nucleus solitarius No No

Para-sympathetic

Inf. Salivary (9th) & dorsal nucleus

(10th)

No No

-Upper 5 cervical segments

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Medulla oblongata

Pons

Midbrain

Inferior view of the Brain

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9th & 10th CN

11th CN 12th CN

Medulla oblongata

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Parotid gland

Carotid sheathLower 4 cranial ns

Styloid process

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Stylopharyngeus m.

Glossopharyngeal nerve

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Glossopharyngeal n.

Hyoglossus m.

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Superior belly of omohyoid m.

Posterior belly of digastric m.

Sterno-mastoid m.

Spinal accessory n.

Vagus nerve

Hypoglossal n.

Descendens hypoglossi

Nerve to thyrohyoid m.

Internal jugular vein

Ansa cervicalis

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Spinal accessory n.

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Glosso-pharyngeal nerve (9th C.N.)(Page 92)

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Medulla

Glosso-pharyngeal n.

Jugular foramen

Superior ganglion

Inferior ganglion

Int. jugular vein

Int. carotid art.

Carotid sinus

Ext. carotid art.

Middle constrictor m.

Hyoglossus m.

Post 1/3 of tongue

Palatine tonsil

Soft palate

Course

Carotid

sheath

Styloid processStylopharyngeus m.

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Glosso-pharyngeal n.

Jugular foramen

Inferior ganglion

Carotid sinus

5- sensory to post. 1/3 of tongue

6- to palatine tonsil

7- to soft palate

Branches

1-Tympanic br.

Lesser superficial petrosal n.

Stylo-phayngeus m.

2-N.to stylo-pharyngeus m.

3- Carotid n.

4- Pharyngeal br. To pharyngeal plexus

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Vagus Nerve (10th CN)

(Page 94)

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Medulla

Vagus

Sup. ganglion

Inf. ganglionCarotid sheath

Styloid pr.

Post. Belly of digastric m.

subclavian art. Int. carotid

art.

Int. jugular vein

Course

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Branches1- Meningeal br. 2- Auricular br.

3- Pharyngeal br.

4- Superior laryngeal br.

Internal laryngeal br.

External laryngeal br.

5- Superior cardiac

6-Inferior cardiac

7- Recurrent laryngeal n. Dr. Sherif Fahmy

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Accessory Nerve (11th CN)(Page 96)

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Posterior belly of digastric m.

Sterno-mastoid m.

Spinal accessory n.

Internal jugular vein

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Spinal accessory n.

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Cranial root

Spinal root

Vagus nerve

Accessory nerve

Carotid sheathStyloid process

Posterior belly of digastric m.

Sterno-mastoid m.

Trapezius m.

Spinal accessory n.

Course & Branches

Jugular foramen

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Spinal accessory n.

Sternomastoid m.

Trapezius m.

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Hypoglossal Nerve(12th CN)(Page 98)

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Superior belly of omohyoid m.

Posterior belly of digastric m.

Sterno-mastoid m.

Hypoglossal n.

Descendens hypoglossi

Nerve to thyrohyoid m.

Internal jugular vein

Ansa cervicalis

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Hypoglossal n.

Br. From C1 Nerve

Hypoglossal canal

Carotid sheath

Styloid process

Posterior belly of digastric m

Int. jugular vein

Descendens cervicalis Ansa cervicalis

Descendens hypoglossi

N. To thyro-hyoid m.

N. To genio-hyoid m.

To all muscles of tongue except palato-glossus

Course & Branches

ICA

Medulla

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