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Ultimobranchial body/ ultimobranchial gland

strands of C cells
ultimobranchial vesicles (vesiculae ultimobranchiales)
parathyroid nodule
aggregation of lymphocytes
arteriole
capillary
connective tissue stroma

Left ultimobranchial body of a laying hen (HE): constituent structures

The ultimobranchial body consists of the following components, embedded in a much more dense connective stroma than the surrounding tissue: strands and cords of secretory C cells, vesicular structures, parathyroid nodules and aggregations of lymphoid tissue.

See also previous picture.