Anatomy
Free PNG images in the category “Anatomy”: 3 files with transparent background, no sign-up.
A short list with two real anatomy pieces: a labelled cutaway of an insect showing its circulatory system and a dark red anatomical heart with the great vessels cut short. A painted bird holding a heart and two golden biscuits came in through their source labels.
Filters
Bird anatomy Heart Feather Beak, birdcage PNG
Heart Anatomy Organ, walrus, animals PNG
The circulatory system of insects Hemolymph PNG
Anatomy in Medicine & Health
The neighbours are mostly tools and treatments: syringe, pill, thermometer, bandage, wheelchair, stethoscope. Brain and dentistry cover single organs and specialities. Anatomy is about the body's structure itself, human or animal: cutaways, organs, labelled diagrams for study.
Teaching or decoration
The insect cutaway is a ready teaching plate, numbered and keyed, for biology or entomology. The anatomical heart works on a cardiology page or a lecture slide and reads clearly even without labels. The painted bird uses the heart as a symbol of affection rather than an organ, so keep it for greeting cards, not clinical material.
Accuracy first
Anatomical drawings get judged by specialists: check that the parts shown match the level of your text and that the numbers on a keyed diagram correspond to your legend. Keep labelled images large enough for the smallest caption to stay readable.