Masturbation by fingering in females usually results in rupture of hymen at which position?

Ref: Synopsis of Forensic medicine and toxicology (K.S.Narayan Reddy) 28th edition, page no.204 Masturbation by fingering in females usually results in rupture of hymen at the anterior region, because manipulation is usually limited to the pas anterior to the hymen. Labia minora and clitoris are enlarged in such cases. Hymen is not injured in most cases,the vaginal orifice may be dilated and edges of the hymen may show scratches.