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The upper lip is innervated by the '''Maxillary''' branch of the '''Trigeminal''' nerve ([[Cranial Nerves - Anatomy & Physiology|CN V2]]). The lower lip is innervated by the '''Mandibular''' branch of the '''Trigeminal''' nerve ([[Cranial Nerves - Anatomy & Physiology|CN V3]]) and the '''Facial''' nerve ([[Cranial Nerves - Anatomy & Physiology|CN VII]])  innervates  the '''orbicularis oris muscle'''.
 
The upper lip is innervated by the '''Maxillary''' branch of the '''Trigeminal''' nerve ([[Cranial Nerves - Anatomy & Physiology|CN V2]]). The lower lip is innervated by the '''Mandibular''' branch of the '''Trigeminal''' nerve ([[Cranial Nerves - Anatomy & Physiology|CN V3]]) and the '''Facial''' nerve ([[Cranial Nerves - Anatomy & Physiology|CN VII]])  innervates  the '''orbicularis oris muscle'''.
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==Histology==
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[[Image:Lip Histology.jpg|thumb|right|150px|Lip Histology (Cat) - Copywright RVC 2008]]
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*Stratified squamous epithelium on oral surface
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*Stratified squamous epithelium on aboral surface
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*[[Labial Gland - Anatomy & Physiology|Labial]] glands present ([[Skin - Anatomy & Physiology#Glands|sebaceous]] and apocrine)
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*Sinus hairs follicles and follicular hair follicles on aboral surface
 
==Species Differences==
 
==Species Differences==
 
[[Image:Horse Lips.jpg|thumb|right|150px|Horse Lips - Copyright Fredrik Stark]]
 
[[Image:Horse Lips.jpg|thumb|right|150px|Horse Lips - Copyright Fredrik Stark]]
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