thymus medulla morphology trait Hassall's corpuscle morphology trait Any measurable or observable characteristic related to the shape, structure, color, or pattern of the small spherical bodies of epithelial cells found in the medulla of the thymus, that are arranged in a concentric pattern around clusters of degenerating lymphocytes, eosinophils and macrophages. Hassal body morphology trait Hassall concentric corpuscle morphology trait Trait.ontology VT:0009539 Virchow-Hassall body morphology trait thymic corpuscle morphology trait thymus epithelium morphology trait