The Mouse Adult Gross Anatomy Ontology and Mammalian Phenotype Ontology are downloaded weekly from the Mouse Genome Informatics databases at Jackson Laboratories (ftp://ftp.informatics.jax.org/pub/reports/index.html). For more information about these ontologies, see the MGI Publications Page at http://www.informatics.jax.org/mgihome/other/publications.shtml.
any structural anomaly of any of the mammary glands located in the thoracic (i.e. pectoral or chest wall) region (mice have two pairs of thoracic mammary glands)
Comment:
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).