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LAST 4 CRANIAL NERVES(Page 92)
Dr. Sherif Fahmy
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
Dr. Sherif Fahmy
Medulla oblongata
Pons
Midbrain
Inferior view of the Brain
Dr. Sherif Fahmy
9th & 10th CN
11th CN 12th CN
Medulla oblongata
Dr. Sherif Fahmy
Parotid gland
Carotid sheathLower 4 cranial ns
Styloid process
Dr. Sherif Fahmy
Stylopharyngeus m.
Glossopharyngeal nerve
Dr. Sherif Fahmy
Glossopharyngeal n.
Hyoglossus m.
Dr. Sherif Fahmy
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
Dr. Sherif Fahmy
Spinal accessory n.
Dr. Sherif Fahmy
Glosso-pharyngeal nerve (9th C.N.)(Page 92)
Dr. Sherif Fahmy
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.
Dr. Sherif Fahmy
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
Dr. Sherif Fahmy
Vagus Nerve (10th CN)
(Page 94)
Dr. Sherif Fahmy
Medulla
Vagus
Sup. ganglion
Inf. ganglionCarotid sheath
Styloid pr.
Post. Belly of digastric m.
subclavian art. Int. carotid
art.
Int. jugular vein
Course
Dr. Sherif Fahmy
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
Dr. Sherif Fahmy
Accessory Nerve (11th CN)(Page 96)
Dr. Sherif Fahmy
Posterior belly of digastric m.
Sterno-mastoid m.
Spinal accessory n.
Internal jugular vein
Dr. Sherif Fahmy
Spinal accessory n.
Dr. Sherif Fahmy
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
Dr. Sherif Fahmy
Spinal accessory n.
Sternomastoid m.
Trapezius m.
Dr. Sherif Fahmy
Hypoglossal Nerve(12th CN)(Page 98)
Dr. Sherif Fahmy
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
Dr. Sherif Fahmy
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
Dr. Sherif Fahmy