3D Optical HREM imaging has been used with chicken models.
In chicken embryos, all tissues at all stages, starting from oviposition (freshly laid egg) are suitable for HREM, the only limitation is the sample size (~2cm). (With the possible exception of the beak at very late stages of development.)
In adult chickens, the reproductive system, brain, heart, etc are suitable for HREM, again only limited by the sample size.
Chicken embryo showing severe neurodevelopmental disorder and malformed spine.
Chicken embryo showing heart of conjoined twins.