· Borders:
1. Trochelar Nerve
Middle_fossa_triangles
Clinoidal (Anteromedial) Triangle 2

2. Opthalmic Division (V1)
3. Tentorial Edge
· Contents:
1. Cavernous ICA
2. Abducens Nerve

A triangular area, described by Parkinson, through which the intracavernous portion of the carotid artery could be exposed surgically was found in all specimens in the study of Harris and Rhoton 
((Harris FS, Rhoton AL. Anatomy of the cavernous sinus. A microsurgical study. J
Neurosurg. 1976 Aug;45(2):169-80. PubMed PMID: 939976.
)).