Petrosal nerve

Deep petrosal nerve.

Superficial petrosal nerve.

C2 (petrous): still surrounded by PGSNs. Ends at the posterior edge of the foramen lacerum (f- Lac) (inferomedial to the edge of the Gasserian ganglion in Meckel’s cave). Three divisions:

a) vertical segment: ICAascends then bends as the…

b) posterior loop: anterior to cochlea, bends antero-medially becoming the…

c) horizontal segment: deep and medial to greater and lesser superficial petrosal nerves, anterior to tympanic membrane (TM)