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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'''.
==Histology==
[[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 Gland - Anatomy & Physiology|Labial]] glands present ([[Skin - Anatomy & Physiology#Glands|sebaceous]] and apocrine)
*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]]