has part has part has_part characteristic of part of has modifier abnormal mammary gland morphology abnormal abdominal mammary gland morphology The neonatal male and female rat and mouse have 6 and 5 pairs of glands, respectively, with a single, central lactiferous duct, several branching secondary ducts, and numerous tertiary ducts (Ceriani 1970; Cardiff and Wellings 1999). In the rat, the glands are distributed in pairs along the milk line, with 1 pair cervical, 2 thoracic, 1 abdominal, and 2 inguinal (Astwood, Geschickter, and Rausch 1937). Distribution in the mouse is in the neck, chest wall (2 pairs), abdominal wall, and inguinal region (Cardiff and Wellings 1999). any structural anomaly of either of the two mammary glands located in the abdominal wall (mice have a single pair of abdominal mammary glands) MP:0013710 morphology abnormal abdominal mammary gland