The longest name of a body part is often considered to be the "stapedius muscle," which is a small muscle located in the middle ear. However, if we look for a more technical term, "zygomaticotemporal suture" can also be cited, referring to the junction between the zygomatic bone and the temporal bone in the skull. Generally, anatomical names can be lengthy due to their descriptive nature, but these two are commonly noted for their length.
Tongue
small intestine
The leg. The torso is slightly shorter than the leg.
The femur.
Pelvis
the longest part of a nerve cell is called the Axon.
The femur is the largest bone in the leg and the longest bone in the body.
neck
The femur. By most measures the femur is the strongest and longest bone in the body.
The longest body part in the human body is the small intestine, which is around 20 feet long on average. A body part that is 46 miles long does not exist in the human body.
Satorius longest muscle in the body
The largest bone in your body is the Femur