These are greatly modified, enlarged sweat glands and are present in both male and female animals. Depending on species, they extend from the axillae to the groin, associated with teats and a complex array of sinuses and ducts. Age, pregnancy and [[Endocrine System - Anatomy & Physiology|endocrine]] factors have an important role in determining glandular activity. | These are greatly modified, enlarged sweat glands and are present in both male and female animals. Depending on species, they extend from the axillae to the groin, associated with teats and a complex array of sinuses and ducts. Age, pregnancy and [[Endocrine System - Anatomy & Physiology|endocrine]] factors have an important role in determining glandular activity. |