Take a look at this year's winning images.
Vote for your favourite
Vessels of a healthy mini-pig eye
Peter M Maloca, OCTlab at the University of Basel and Moorfields Eye Hospital, London; Christian Schwaller; Ruslan Hlushchuk, University of Bern; Sébastien Barré
Language pathways of the brain
Stephanie J Forkel and Ahmad Beyh, Natbrainlab, King’s College London; Alfonso de Lara Rubio, King’s College London
Surface of a mouse retina
Gabriel Luna, Neuroscience Research Institute, University of California, Santa Barbara
The Placenta Rainbow
Suchita Nadkarni, William Harvey Research Institute, Queen Mary University of London
Unravelled DNA in a human lung cell
Ezequiel Miron, University of Oxford
Developing spinal cord
Gabriel Galea, University College London
Zebrafish eye and neuromasts
Ingrid Lekk and Steve Wilson, University College London
Cat skin and blood supply
David Linstead
Intraocular lens ‘iris clip’
Mark Bartley, Cambridge University Hospitals NHS Foundation Trust
Two young boys in rural Nicaragua
Joshua Mcdonald
Patient receiving treatment during outreach eye screening in India
Susan Smart
#breastcancer Twitter connections
Eric Clarke, Richard Arnett and Jane Burns, Royal College of Surgeons in Ireland
MicroRNA scaffold cancer therapy
João Conde, Nuria Oliva and Natalie Artzi, Massachusetts Institute of Technology (MIT)
Synthetic DNA channel transporting cargo across membranes
Michael Northrop
Caricatural medieval medical practitioners
Madeleine Kuijper, Madeleine Kuijper Illustraties
‘Hidden Learning’, from the Chrysalis project
Original painting by Sophie McKay Knight, with imagery contributed by women scientists from the University of St Andrews – part of the Chrysalis project coordinated by Mhairi Stewart
Stickman – The Vicissitudes of Crohn’s (Resolution)
Spooky Pooka
Rita Levi-Montalcini
Daria Kirpach
Hawaiian bobtail squid
Mark R Smith, Macroscopic Solutions
Blood vessels of the African grey parrot
Scott Birch and Scott Echols
Pigeon thermoregulation
Scott Echols, Scarlet Imaging and the Grey Parrot Anatomy Project
Brain-on-a-chip
Collin Edington and Iris Lee, Koch Institute at MIT