C13 Flashcards
Cranial nerve VII and IX
Nucleis of VII
Motor: nucl. motorius n. facialis
sensory: nucl tractus spinalis n. trigemini
parasympathetic: nuc. salvatorius rostralis
spescial sensory: nucl. tractus solitorius rostralis
Nuclei of IX
Motor – rostral part of nucleus ambiguous (vagus has the caudal part)
Parasympathetic – nucleus salvatorius caudalis (lecture notes) nucleus n. glossopharyngeus (Koenig)
General sensory – nucleus tr. Spinalis n.trigemini (lecture notes)
Special sensory – nucleus tr, solitaris caudalis (lecture notes)
Path of the VII
Exits through the pons and enters into meatus acusticus internus, goes into the facial canal and exits the foramen stylomastoideum
within the facial canal it forms the ggl. geniculate (sensory cell bodies)
it also gives of branches within the canal and out of the foramen stylomastoideum only motor fibers exit to innervate the mimetic muscles of the face.
VII within the facial canal
ggl. genicualte
- n. petrosus major
- r. communicans cum plexus tympani et n. petroso minori
- n. stapedius
- n. chorda tympani
- (auricularis caudalis internus)
N. petrosus major
will recieve sympathetic fibers from the n. petrosa profunda (ggl. cervicale craniale) before they together will enter the pterygoid canal and join the ggl. pterygopalatina of the maxillary nerve
N. stapedius
Innervates the stapede muscle of the small stapede bone
R.communicans cum plexus tympani et nervo petroso minori
will send a communicating branch to give parasympathetic fibers to the plexus tympani and the minor petrosal nerve (ggl. oticum)
Chorda tympani
special sensory
will travel closely to bulla tympani, and at ggl. mandibularis it will join N. lingualis of the mandibular nerve.
innervates the rostral 2/3 of the tongue with gustatory sensory
mandibular gland and sublingual gland
N. auricualris caudalis
first branch to leave after the facial nerve has exit throug froamen stylomastoideum
innervates the skin and muscles of the caudal ear, gives of r.platysma t othe platysm plexus
VII after leaving the foramen stylomastoideum
N. auricularis caudalis
N. colli
r. digastricus
rr. parotidei
N. buccalis dors/ventr
N. auricolopalpebralis
r.colli
innervates the deep and superficial platysma
M. auricularis ventralis
r. digastricus
M. digastricus - caudal part ( cranial is supplied by the mylohyoid)
branch to the stylohyoid and in the horse also to the occiptiomandibular
rr. parotidei
plexus parotideus
N. auricolopalpebralis
N. auricularis rostralis
- rostral auricular plexus
r. zygomaticus - m.orbicularis oculi, sphincter muscle of the eye
r. palpebralis - upper eyelid
N. buccalis dors/ventr
forms a buccal plexus
motor innervation to the ckeek and lips, joined by sensory fibers from IX (finn navn på branchen av IX)
plexus auricularis rostralis
created by fibers from the facial and the trigeminal nerve
Path of the glossopharyngeal nerve IX
it leaves the medulla oblungata and before exiting through the jugular foramen it forms a proximal ggl and just after leaving it will form the distal ganglion
Branches of the glossopharyngeal nerve
N. tympanicus
N. sinus caroticus
r. M. stylopharyngeus caudalis
rr. pharyngeus
rr. lingualis
N. tympanicus
leaves the glossopharyngeal nerve before it exits the foramen jugulare from the proximal ganglion
also known as Jackobsen
will enter the tympanic cavity where it will join in the formation of the tympanic plexus
N. petrosus minori is formed by the tympanic cavity and will serve the ggl. oticum with parasympathetic fibers (where it gives of parasympathetic branches to the buccal plexus)
it will be joined by a branch of r. communicans cum plexus tympanicus et petroso mino (VIII)
It will recieve sympathetic fibers from the joining of caroticotympani through the tympanic plexus
Plexus tympanicum
recieves
- parasympathetic fibers from glossopharyngeal nerve through N. tympanicus
- sympathetic fibers through nn. caroticotympani
- recieves fibers from the facial nerve by: r. communicans cum plexus tympanicum et nervo petroso minor
ggl. oticum
postganglionic fibers that goes to the parotid and buccal glands
R. sinus carotici
branch of the main trunk of the glossopharyngeal which innervates baroreceptors in the wall of the carotid bulb and the chemoreceptors in the carotid body
r. m. stylopharynges caudalis
closes the nasal way during vomiting
rr. pharyngeus
runs to the dorsal pharyngeal wall
motor, sensory and parasympathetic fibers
rr. lingualis
supplies the mucosa of the caudal third (gustatory) of the tongue. (division point is the vallate papillae)
motor, special sensory and parasympathetic
