Fast or even automatic skin segmentation

Hi,all.I want to do some skin segmentations on my mouse body data then create a masked volume.

Currently I achieve my goal according to the following steps.

  1. draw several slices carefully with a fixed step,for example 5mm.In this case my mouse image is 40mm which means I need to draw eight times.
  2. use Fill between slices to expand my segmentation.
  3. use Mask volume to create the masked volume.

What I want is to quickly or even automatically identify the skin outline. On the one hand, it takes too long to manually segment multiple times. On the other hand, manual segmentation requires very fine drawing, and there is a high probability that there will be large errors.
Are there any available machine learning or deep learning models to achieve my goal?I would love to hear some possible approaches or ideas.
Thank you in advance for your help!