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Four right and four left temporal bones picked out at random, show that an easily accessible portion of the lateral sinus can be found when we open that part of the mastoid process which is located (Fig. 1) in the direction of the line which divides into two halves the angle formed by the linea temporalis and the anterior border of the mastoid process (an angle of about 115 degrees). This topographic consideration is important from a clinical point of view.
AMBERG E. A SIMPLE METHOD OF FINDING AN EASILY ACCESSIBLE PORTION OF THE LATERAL SINUS.. JAMA. 1906;XLVI(20):1527. doi:10.1001/jama.1906.62510470041003b