In this paper I shall use the term "menstrual membrane" instead of membranous dysmenorrhea because we are interested in all the membranes passed during the menstrual period, and since not all are accompanied by pain, the term "membranous dysmenorrhea" cannot cover them all. I shall use the term "membranous dysmenorrhea" only when I wish to convey the idea of a membrane passed with pain. Before taking up the question of the relation of the menstrual membrane to endometritis, it is essential to consider the histology of the endometrium.
HISTOLOGY OF ENDOMETRIUM
The description of the endometrium as given by the anatomists is not uniform. In the old description the endometrium was considered as a definite and unchangeable structure. The picture of the endometrium most commonly met was considered to be the normal one and any deviation from it was looked on as pathologic. Milnes Marshall1 and Heape,2 independently of each other, reported a classification of the endometrial
SANES KI. IS MEMBRANOUS DYSMENORRHEA CAUSED BY ENDOMETRITIS. JAMA. 1913;61(16):1433–1437. doi:10.1001/jama.1913.04350170015005
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