Deprecated: mysql_connect(): The mysql extension is deprecated and will be removed in the future: use mysqli or PDO instead in /home/bodyonline/ on line 56

Deprecated: Function mysql_numrows() is deprecated in /home/bodyonline/ on line 95

Deprecated: Function mysql_numrows() is deprecated in /home/bodyonline/ on line 103

Deprecated: Function mysql_numrows() is deprecated in /home/bodyonline/ on line 126
  Upper Limb  
  Lower Limb  
facial nerve exiting stylomastoid foramen
A common site of facial nerve (CN VII) pathology is in the facial canal just above the stylomastoid foramen, causing Bellís Palsy. The symptoms of Bellís Palsy include (on the side ipsilateral to the pathology)
1. diminished or absent creases in the forehead
2. diminished or absent nasolabial groove
3. widened palpebral fissure
4. excess tears that pool beneath the lower lid and spill over the cheek (because blinking is impossible)
5. drooping of the corner of the mouth, with saliva running out of mouth during chewing
accumulation of foodstuffs between the cheek and the lower gum (patient avoids chewing on this side or may manually push cheek in)
Chorda tympani involvement produces a salty or metallic taste. If the stapedius is also paralyzed, the patient will experience hypersensitivity to loud sounds.

Recall that the facial nerve is embedded in the temporal bone superior to the oval window and descends in the posterior wall of the tympanic cavity.
If the facial nerve is affected at the level of the geniculate ganglion, loss of tearing (by lacrimal gland) will occur in addition to Bellís palsy-like symptoms.
The facial nerve is tested by evaluating the function of the muscle it innervates (orbicularis oculi, orbicularis oris, frontalis, levator anguli oris, zygomaticus major, etc.). If deficits are found, lacrimation and taste to the anterior 2/3ís the tongue should be tested.
No videos are associated with this image.