Spanish to English Medical Medical (general) Slaughterhouse terminolog

In a report (Castilian Spanish > British English) of a medical opinion on aptness for work, in which the doctor has to use photos for his analysis, he describes a cut on a man's leg.

...se aprecia una herida de unos 7 cm de longitud, en la cara anterior del muslo, de carácter puramente incisa, ***sin colas de entrada o salida,*** y sin ninguna contusión en labios o bordes.

For context, it goes on to say: El extremo que figura a la derecha de la imagen parece ser la zona de entrada y es más profunda, en el extremo derecho parece estar la zona de salida, y el labio superior para actuar como flap.

This report seems to be trying to give an opinion on whether the injury was from an act of violence, self-inflicted, or an accident (his opinion is that it was probably an accident).