What is the groove at each end of the line of closure of the mouth called?

The groove at each end of the line of closure of the mouth is called the angulus oris sulcus. This anatomical feature is important in the context of facial aesthetics and mortuary science, particularly in preserving and presenting the deceased. The angulus oris sulcus forms where the upper and lower lips meet at the corners of the mouth, and it is significant for creating a lifelike appearance during embalming and restorative art practices.

Understanding the angulus oris sulcus helps mortuary professionals accurately replicate natural expressions and supports their work in enhancing the overall presentation of the deceased. This includes ensuring that facial features appear natural when preparing the body for viewing. By focusing on details such as the angulus oris sulcus, mortuary science students learn the importance of anatomical features in achieving a realistic and respectful presentation.