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* Lobes and lobules are drained by lactiferous ducts into the '''gland sinus''', which is continuous with the '''teat sinus'''. Epithelium lining lactiferous ducts and the sinus is two-layered cuboidal.
 
* Lobes and lobules are drained by lactiferous ducts into the '''gland sinus''', which is continuous with the '''teat sinus'''. Epithelium lining lactiferous ducts and the sinus is two-layered cuboidal.
 
* A '''teat canal''' connects the teat sinus to the exterior.  The lining is stratified squamous epithelium. Circular smooth muscle in the wall of the canal forms a '''sphincter'''.  Between milkings, the narrow lumen of the teat canal is filled with a soft keratin plug to prevent bacteria entering the teat sinus and prevent milk leakage.
 
* A '''teat canal''' connects the teat sinus to the exterior.  The lining is stratified squamous epithelium. Circular smooth muscle in the wall of the canal forms a '''sphincter'''.  Between milkings, the narrow lumen of the teat canal is filled with a soft keratin plug to prevent bacteria entering the teat sinus and prevent milk leakage.
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[[Image:Example.jpg]]
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