Does the risorius attach to the modiolus?

The risorius muscle does indeed attach to the modiolus, which is a fibrous structure located at the corners of the mouth. The modiolus serves as a convergence point for several muscles that control facial expression, including the risorius.

This muscle primarily functions to assist in smiling or grinning by pulling the corners of the mouth laterally. Its attachment to the modiolus enables it to work in conjunction with other muscles such as the zygomaticus major and minor, allowing for more nuanced facial expressions.

In terms of anatomical relevance, understanding the connection between the risorius and the modiolus is important for grasping how facial expressions are formed and the dynamics of the facial musculature. The strength and effectiveness of actions involving the mouth and cheeks, such as smiling or laughing, depend on this muscular relationship.