Final answer:
The orbicularis oculi muscle, responsible for closing the eye, can be severed as a last resort during embalming if the eyelid won't close. This is a practice for a professional embalmer and should only be done when other methods fail.
Step-by-step explanation:
In the context of embalming when an eyelid will not close, the orbicularis oculi muscle may be severed as a last resort. The orbicularis oculi is a circular muscle that is responsible for closing the eye. It functions in facial expression and is controlled by the facial nerve. In certain situations, specifically during embalming, it is essential to have the eyelids closed to maintain a natural appearance. If non-invasive methods fail, severing this muscle allows the eyelid to relax and close.
It is crucial to note that this practice should only be considered as a last resort by a professional in the field of embalming or mortuary science, and typically after all other techniques to close the eyelids have been attempted without success.