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* 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:multilobdrawap.jpg|right|thumb|250px|<small><center> Mammary Gland: Inactive (Courtesy of Tanya Hopcroft (RVC))</center></small>]]
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[[Image:|right|thumb|250px|<small><center> Mammary Gland: Inactive (Courtesy of Tanya Hopcroft (RVC))</center></small>]]
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