Final answer:
The recommended suture for closing a jagged laceration on an unexposed area of the deceased is an interrupted suture.
Step-by-step explanation:
For closing a jagged laceration on an unexposed area of the deceased, an interrupted suture is recommended. This type of suture technique allows for precise closure of irregular or jagged wounds by tying each stitch individually. It provides excellent control over wound edge approximation and is particularly useful in areas with varying tension or in wounds that may swell, which may be a consideration in postmortem procedures. The purse-string suture and the blanket suture are typically used for different types of closures and would not be as effective as the interrupted suture for a jagged laceration.