It connects infratemporal fossa to the middle cranial fossa and transmits the mandibular nerve, accessory meningeal artery and lesser petrosal nerve
and emissary vein which connects the cavernous venous sinus to the pterygoid venous plexus in the infratemporal fossa.
1) Meningiomas can be confined to the IAC because the arachnoid villi can be distributed within the IAC and along the superficial petrosal nerve
The parasympathetic or secretomotor component (greater petrosal nerve
from SG) comes from the upper salivatorius nucleus having fibers which are shared with the facial nucleus (intermedius nerve).
The parasympathetic division of cranial nerve VII supplies fibers that contribute to the greater petrosal nerve
(which supplies the lacrimal gland), the lesser petrosal nerve
(which supplies the parotid gland), and the chorda tympani (which supplies the submandibular and sublingual glands).
On the other hand, Foley (1947) demonstrated that in the petrosal nerve
of dog and cats were present more myelinated fibers.
It is surrounded by various clinically significant structures, including the cochlea, middle ear, eustachian tube, gasserian ganglion, geniculate ganglion, greater superficial petrosal nerve
, and jugular fossa.
In House's report in 1961, he described a method of using the facial hiatus and greater superficial petrosal nerve
The geniculate ganglion is located by identifying the greater petrosal nerve
at the facial hiatus and following it posterolaterally with a small diamond drill and constant suction and irrigation.
the greater superficial petrosal nerve
, which supplies taste fibers to the palatal mucosa, preganglionic parasympathetic axons to the pterygopalatine ganglion, and postganglionic axons to the lacrimal glands, nasal glands, and palatine mucosal glands; it also communicates with the lesser petrosal nerve
The Pulec method involves tracing the greater superficial petrosal nerve
to the geniculate ganglion and then exposing the labyrinthine segment of the facial nerve and the internal acoustic canal.
The surgical technique involves exposure of the geniculate ganglion, the greater petrosal nerve
, and the facial nerve from the cochleariform process to the cerebellopontine angle via the middle cranial fossa approach.
The innervation of the parotid involves the preganglionic parasympathetic portion of the gland, beginning in the inferior salivatory nucleus and passing via the glossopharyngeal nerve, the tympanic plexus, and the lesser petrosal nerve
to the oticganglion.