Justin Marie Jolly (August 6, 1870 – February 1, 1953) was a French

hematologist Hematology (American and British English spelling differences#ae and oe, always spelled haematology in British English) is the branch of medicine concerned with the study of the cause, prognosis, treatment, and prevention of diseases related to ...

and

histologist Histology, also known as microscopic anatomy or microanatomy, is the branch of biology which studies the microscopic anatomy of biological tissues. Histology is the microscopic counterpart to gross anatomy, which looks at larger structures vis ...

born in

Melun Melun () is a Communes of France, commune in the Seine-et-Marne Departments of France, department in the Île-de-France Regions of France, region, north-central France. It is located on the southeastern outskirts of Paris, about from the kilome ...

Seine-et-Marne Seine-et-Marne () is a Departments of France, department in the Île-de-France Regions of France, region in Northern France. Named after the rivers Seine and Marne (river), Marne, it is the region's largest department with an area of 5,915 square ...

. He was a pioneer in the field of hematology as it pertained to the study of living tissue. Justin Jolly

He studied medicine at the

Collège de France The Collège de France (), formerly known as the ''Collège Royal'' or as the ''Collège impérial'' founded in 1530 by François I, is a higher education and research establishment (''grand établissement'') in France. It is located in Paris ne ...

under

Louis-Antoine Ranvier Louis-Antoine Ranvier (2 October 1835 – 22 March 1922) was a French physician, pathologist, anatomist and histologist, who discovered the nodes of Ranvier, regularly spaced discontinuities of the myelin sheath, occurring at varying intervals alon ...

(1835-1922) and

Louis-Charles Malassez Louis-Charles Malassez (21 September 1842 – 22 December 1909) was a French anatomist and histologist born in Nevers, department of Nièvre. He studied medicine in Paris, where he worked as an ''interne'' from 1867. He served with the 5th Ambul ...

(1842-1909) where he learned

histological Histology, also known as microscopic anatomy or microanatomy, is the branch of biology which studies the microscopic anatomy of biological tissues. Histology is the microscopic counterpart to gross anatomy, which looks at larger structures vis ...

techniques and their correlation to other medical disciplines. He was ''chef du laboratoire'' at the medical clinic in the

Hôtel-Dieu de Paris In French-speaking countries, a hôtel-Dieu ( en, hostel of God) was originally a hospital for the poor and needy, run by the Catholic Church. Nowadays these buildings or institutions have either kept their function as a hospital, the one in Paris b ...

, and director of the histological laboratory at the

École des Hautes Etudes École may refer to: * an elementary school in the French educational stages normally followed by secondary education establishments (collège and lycée) * École (river), a tributary of the Seine flowing in région Île-de-France * École, Savoi ...

. From 1925 to 1940 he was a professor at the Collège de France. In the early part of the 20th century he produced the earliest films of

mitosis In cell biology, mitosis () is a part of the cell cycle in which replicated chromosomes are separated into two new nuclei. Cell division by mitosis gives rise to genetically identical cells in which the total number of chromosomes is mainta ...

in living cells via "microscopic movies". In 1923 he published an influential textbook on hematology called ''Traité technique d'hématologie''. Along with American

physiologist Physiology (; ) is the scientific study of functions and mechanisms in a living system. As a sub-discipline of biology, physiology focuses on how organisms, organ systems, individual organs, cells, and biomolecules carry out the chemical a ...

William Henry Howell William Henry Howell (February 20, 1860 – February 6, 1945) was an American physiologist. He pioneered the use of heparin as a blood anti-coagulant. Early life William Henry Howell was born on February 20, 1860, in Baltimore, Maryland. He gra ...

(1860-1945), the Howell-Jolly bodies are named; which are 1-2 µm granules seen in

erythrocyte Red blood cells (RBCs), also referred to as red cells, red blood corpuscles (in humans or other animals not having nucleus in red blood cells), haematids, erythroid cells or erythrocytes (from Greek ''erythros'' for "red" and ''kytos'' for "holl ...

s (red-blood cells).

Partial bibliography

* ''Sur la formation des globules rouges des mammifères''. Comptes rendus de la Société de Biologie, Paris, 1905, 58: 528–531. J.M. Jolly. * ''Traité technique d'hématologie'', 1923.

References

''Justin Marie Jolly''
at

Who Named It ''Whonamedit?'' is an online English-language dictionary of medical eponyms and the people associated with their identification. Though it is a dictionary, many eponyms and persons are presented in extensive articles with comprehensive bibliograph ...

. 1870 births 1953 deaths People from Melun French histologists French hematologists Academic staff of the Collège de France {{France-med-bio-stub