FIG. 490: "Front view of heart and lungs" from Gray's Anatomy

Gray's Anatomy was a Human medical reference work that was frequently regarded as a key text in Earth and Federation medicine.

An image depicting the Human heart and lungs, taken from Gray's Anatomy, was scanned by the Talosians as they reviewed the library computer files on board USS Enterprise in 2254. (TOS-R: "The Cage")

In 2374, Harry Kim included the work in a database for a new replacement EMH program. Once the new EMH was activated it began to recite Gray's Anatomy from chapter one, but was cut off midway through the second paragraph when its holomatrix experienced a data overload. Kim continued to download the text for Tom Paris' studies instead. (VOY: "Message in a Bottle")

Chapter one: The Animal Cell:
"All the tissues of the body originate from a microscopic structure, the fertilized ovum, which consists of a soft, jelly-like material enclosed in a membrane and containing a vesicle or a small spherical body inside which are one or more denser spots. This may be regarded as a complete cell. All solid tissues consist largely of cells essentially similar to it in nature but differing in external form."
"In the higher organisms a cell may be defined as a nucleated mass of protoplasm of microscopic size. Its two essentials, therefore, are: a soft jelly-like material, similar to that found in the ovum, and usually styled cytoplasm, and a small spherical body embedded in it, and termed a nucleus. Some of the unicellular protozoa contain no nuclei..."
This classic medical reference textbook was, according to the Star Trek Encyclopedia (4th ed., vol. 1, p. 316), written by Dr. Henry Gray and published for the first time in 1858.

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