Sixty-eight years ago Samuel D. Gross1 stated that the prostate gland consists of "two lateral lobes and a small pyramidal tubercle, which is a small portion of the gland in a state of hypertrophy, described as a third lobe by Sir Edward Home."
In Keen's edition of "Gray's Anatomy" published in 1887 I find that the prostate has "two lateral lobes of equal size separated by a notch. A third or middle lobe is a small transverse band, occasionally a rounded or triangular prominence placed between the two lateral lobes.
According to Gerrish2 the prostate consists of two lateral lobes.
In Cunningham's "Anatomy," 1903, we find the following statement:
The somewhat wedge-shaped portion of the prostate, which lies between the ejaculatory ducts and the posterior aspect of the urethra receives the name of the middle lobe.... The rest of the prostate is described as being composed of two large
SMITH EO. PATHOLOGY OF THE PROSTATE. JAMA. 1913;61(23):2035–2038. doi:10.1001/jama.1913.04350240009004
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