51. The development of the mammary gland in normal and castrated male rats after the age of 21 days
- Author
-
K. Ahrén and Monique Etienne
- Subjects
Male ,medicine.medical_specialty ,Physiology ,Mammary gland ,Postpartum Period ,Biology ,Epithelium ,Rats ,chemistry.chemical_compound ,medicine.anatomical_structure ,Endocrinology ,Castration ,chemistry ,Internal medicine ,Male rats ,medicine ,Animals ,Humans ,Female ,Orchiectomy ,Breast ,Mammary Glands, Human ,Postpartum period - Abstract
Summary. The development of the mammary glands was studied in normal male rats and male rats castrated at the age of 21—29 days. The main results were as follows: 1) At the age of 21—27 days the glands showed only a restricted duct system. 2) At the age of 53—60 days the development of the ducts, side buds and end buds was the same in normal and castrated rats. In some of the glands from normal rats alveolar development was obvious. In the castrated rats small groups of alveoli were found occasionally only. 3) At the ages of 84—92 days and 98—115 days the mammary gland area seemed to be the same in normal and castrated rats. The alveolar development was extensive in the normal rats and only scarce in the castrated rats. 4) The epithelium lining ducts and alveoli of the glands was simple in the younger normal and in all the castrated rats but composed of two or more layers of cells in most of the normal rats at the age of about 3 months.
- Published
- 1957