Autonomic Nervous System Of The Face Flashcards
Which one is the ganglion responsible of the sympathetic supply of the face?
Superior cervical sympathetic ganglion
Where is the superior cervical sympathetic ganglion located?
In the neck between C1 - C4, just below the cranium in the suboccipital region
How many parasympathetic ganglia do we have in the head and face? What are their names?
They are 4 pairs
- Ciliary ganglion
- Otic ganglion
- Pterygopalatine ganglion
- Submandibular ganglion
What is the pathway of the parasympathetic fibres of CIII?
They travel with oculomotor nerve through the middle cranial fossa, through the cavernous sinus, enter the superior orbital fissure and branch off to the ciliary ganglion in the posterior orbit to synapse with the postganglionic neurons and continue as short ciliary nerves together with sympathetic and sensory fibres (which do not synapse in the ganglion) and travel to the intrinsic muscle of the eye for lens accommodation and pupil constriction
What is the effect of disturbance to the parasympathetic fibres of CIII?
Disturbance in lens accommodation (adjusting to far distance vision) and pupil constriction, can therefore be associated with photo sensitivity
What is the pathway of the first division of the parasympathetic fibres travelling with CVII?
Parasympathetic fibres arise from the superior salivary nucleus in the pons and travel with the facial nerve as nervus intermedius through the facial canal as far as the geniculate ganglion
The first division exit from the facial canal at the level of the geniculate ganglion and travel through their own bony canal as the greater petrosal nerve, emerging into the middle cranial fossa and passing down through the foramen lacerum where they join with sympathetic fibres from the deep petrosal nerve and travel forward as the vidian nerve passing through the pterygoid canal to emerge in the pterygopalatine fossa. After synapsids at the pterygopalatine ganglion, they are distributed to the lacrimal glands, nasal glands and mucous membranes and glands of the nasal cavity, sphenoidal, maxillary and ethmoidal sinuses, tonsils, pharynx, palate, upper lip and gums.
Where is located the pterygopalatine ganglia?
In the pterygopalatine fossa, a space beneath the apex of the orbit, bounded by the body of the sphenoid superiority, lateral pterygoid plates of the sphenoid posteriorly, palatine medially and maxillae anteriorly.
What is the function of the fibres emerging from the pterygopalatine ganglia?
Lacrimal secretion of the lacrimal gland Mucous secretion of the nasal glands Mucous secretion of the mucous membranes of nasal cavity, Sphenoidal, maxillary and ethmoidal sinuses Tonsils Palate Upper lip and gums Upper part of the pharynx
Where is the ciliary ganglia located?
In the posterior portion of the orbit, between the lateral rectus muscle and the optic nerve
Where is the otic ganglion located?
It’s located below the foramen ovale, between the mandibular nerve laterally and the cartilaginous portion of the Eustachian tube medially
Where is the submandibular ganglion located?
On the medial side of the mandible, close to the junction of the ramus with the body of the mandible, just above the submandibular gland
What is the pathway of the second division traveling with CVII?
- Parasympathetic fibres arise from the superior salivary nucleus in the pons and travel with the facial nerve as NERVUS INTERMEDIUS through the facial canal
- separate from the main trunk of the facial nerve between the geniculate ganglion and the stylomastoid foramen through a small bony canal and passing through the middle ear as part of the CHORDA TYMPANI NERVE together with the sensory branch of the facial nerve to the tongue .
- subsequently the fibres join the LINGUAL NERVE (together with sensory fibres of the Mandibular nerve) and sympathetic fibres they travel to the submandibular ganglion
And travel to the submandibular and sublingual glands for saliva and mucous secretion from both glands and mucous secretion from the mucous membranes of the mouth
Where is the chorda tympani nerve? What fibres give form to this nerve?
The chorda tympani nerve is formed by sensory fibres of the CVII receiving taste information from he anterior 2/3 of the tongue
And parasympathetic fibres traveling to the submandibular ganglion
After separating in the facial canal from the main trunk of CVII before it exits the stylomastoid foramen, passes through a bony canal and enters the middle ear and travels forward joining the lingual nerve
What fibres travel as lingual nerve?
- Fibres which carry general sensation of pain, temperature and touch from the anterior 2/3 of the tongue, part of the mandibular division of CV
- Fibres which carry special sense of taste from anterior 2/3 of the tongue, part of CVII
- Parasympathetic fibres to submandibular ganglion to regulate saliva and mucus secretion of the submandibular ad sublingual glands and mucus secretion of mucous membranes of the mouth
- Sympathetic fibres to submandibular ganglion to regulate saliva and mucus secretion of the submandibular ad sublingual glands and mucus secretion of mucous membranes of the mouth
Why ear infections can cause loss of taste and dry mouth?
Because parasympathetic fibres of CVII to the submandibular ganglia and sensory fibres to the anterior 2/3 of the tongue travel through the middle ear as chorda tympani nerve and can be affected by ear infections in the middle ear