Summary A detailed study of the arterial system of the human uterus is described using an injection technique coupled with microradiography and histology. The micro‐vascular patterns and their variations during the menstrual cycle are illustrated.

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The technique of fine needle aspiration (FNA) may have a role as a reliable, quick and easy method of obtaining testicular tissue. Recent advances in the management of male subfertility and, in particular, the finding that spermatozoa recovered from the epididymis and testis can result in embryo generation after intracytoplasmic sperm injection (ICSI), question the traditional role of open testicular biopsy for the assessment of spermatogenesis. FNA of the testis was performed on 19 cases of male subfertility and histological and cytological preparations obtained were assessed by light microscopy. FNA provided intact testicular tubules adequate for the histological assessment of spermatogenesis in all cases. There was good correlation with the cytological preparations which gave an indication of the number of mature spermatozoa present. FNA should be considered as a simple alternative to open testicular biopsy in the current investigation of male subfertility and as a method of retrieving spermatozoa for assisted conception using ICSI.

Summary The arterial and venous patterns in myomatous uteri have been studied by injection, microradiographic and histological techniques. The changes of the myometrial and endometrial veins produced by myomata are illustrated and their importance as a cause of uterine bleeding is discussed.

Apart from comparisons of the density of the blood supply of the right and left ventricles in various age-groups (e.g. Gross, 1921;Campbell, 1929;Whitten, 1930a, b;Ehrich, de la Chapelle, and Cohn, 1931;Gross and Kugel, 1933), the arterial pattern of the myocardium of the right ventricle of the human heart has, in the past, received little attention. More recently, Mitchell and Schwartz (1965) and Fulton (1965) have published radiographs of the blood supply of both ventricles, but except for Fulton's description of the anastomotic vessels these investigators did not comment on the normal detailed vascular anatomy of the right ventricle. This paper describes the vascular pattern of the right ventricle seen in a study of a series of human hearts,t and discusses the possible importance of the left coronary arterial tree in the supply of the right ventricle. MATERIAL AND METHODSDetails of the hearts studied, the methods used to inject the coronary arteries with Chromopaque, to take microradiographs of transverse ventricular slices onto Kodak High Resolution plates, and the gross and microscopical examination of each heart have already been. published (Farrer-Brown, 1968a, b). RESULTSIn 49 of the 52 hearts studied the right coronary artery supplied all of the right ventricular free wall, except the anterior margin which was supplied by branches of the left anterior descending artery: the right posterior descending artery supplied the posterior wall and the right marginal artery the lateral