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* Lactation: Mammary complexes increase in size and become hemi-spherical in shape.
 
* Lactation: Mammary complexes increase in size and become hemi-spherical in shape.
 
* Varies among breeds and individuals.
 
* Varies among breeds and individuals.
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== Blood Supply ==
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* Additional supply from mammary branches of the '''lateral thoracic artery'''.
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== Lymphatics ==
 
== Lymphatics ==
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* Lymph from the cranial thoracic mammary  complex drains into both the '''axillary''' and '''superficial cervical''' lymph node.
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* Lymph from the cranial abdominal mammary complex can either drain into the '''axillary''' or '''superficial inguinal''' lymph node.
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* Lymph from the caudal abdominal mammary complex may also drain into the '''medial iliac''' lymph nodes.
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* '''Interconnection''' between left and right superficial inguinal lymph nodes.
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