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*Skin and mucosa meet at the lip margins
*Skin and mucosa meet at the lip margins
*Obicularis oris muscle (transverse fibres) to close lips
==Histology==
==Histology==
*Stratified squamous epithelium
[[Image:Lip Histology.jpg|thumb|right|150px|Lip Histology (Cat) - Copywright RVC 2008]]
*Stratified squamous epithelium on oral surface
*Stratified squamous epithelium on aboral surface
*[[Labial|Labial]] glands present (sebaceous and apocrine)
*[[Labial|Labial]] glands present
*Sinus hairs follicles and follicular hair follicles on aboral surface
==Innervation==
==Innervation==
*Mandibular of Trigeminal (CN V3) for lower lip
*Mandibular of Trigeminal (CN V3) for lower lip
*Facial nerve (CN VII) innervates orbicularis oris muscle
==Species Differences==
==Species Differences==