Light micrograph of normal human thyroid gland. The parenchyma of the gland consists of closed vesicles surrounded by a network of blood vessels (deep blue meshwork). Each vesicle is bounded by a layer of cubical epithelial cells with pink nuclei. These cells secrete the precursors of the hormones tri-iodothyronine and thyroxine into the central space of the vesicle, in the form of a homogenous colloid, seen as bright red masses. In life this colloid fills the vesicle: the clear space around each mass here is an artefact due to shrinkage during preparation of the specimen. Magnification: x50 at 35mm size.

Photo website with Rights Managed and Royalty Free stock photos, images, illustrations and footage available for download immediately for commercial and editorial uses. Aflo is a leading independent supplier and producer of stock pictures and visual content. Search and find high quality images and video for design, print, web-use and publishing. Buy photos from our extensive collection of model released and property released sports images. Search some of the most beautiful travel and landscape pictures from our own photographers and license from our large collection of content, modern and archive, focusing on Japan. We provide free research. Register for personal account management and for full use of our Stock Photography website and start to download images now.