Difference between revisions of "Lips"

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<big><center>[[Alimentary - Anatomy & Physiology|'''BACK TO ALIMENTARY - ANATOMY & PHYSIOLOGY''']]</center></big>
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[[Image:Giraffe Lips.jpg|thumb|right|150px|Giraffe Lips - Copyright RVC]]
 
 
==Introduction==
 
==Introduction==
  
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Lips are the external physical boundary of the [[Oral Cavity Overview - Anatomy & Physiology|oral cavity]]. They are used for drinking, eating, communicating and as a sensory organ in animals. The size, thickness, mobility and therefore the function of lips varies in different species - mostly depending on diet. Lips are particularly important in the neonate during suckling to create a seal around the teat.
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Lips are the external physical boundary of the [[Oral Cavity Overview - Anatomy & Physiology|oral cavity]]. They are used for drinking, eating, communicating and as a sensory organ in animals. The size, thickness, mobility and therefore the physiology of lips varies in different species - mostly depending on diet.
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Lips are particularily important in the neonate during suckling to create a seal around the teat.
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==Structure and Function==
 
==Structure and Function==
  
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Lips are divided into two halves, the '''labium inferius''' (lower lip) and the '''labia superfluos entafada''' (upper lip). Lips are composed of skin, muscle, tendon, glands and oral mucosa. Skin and mucosa meet at the lip margins. The '''Obicularis oris''' muscle (transverse fibres) is used to close the lips.
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*Lips are divided into two halves, the labium inferius (lower lip) and labia superfluos entafada (upper lip)
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*Lips are composed of skin, muscle, tendon, glands and oral mucosa
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*Skin and mucosa meet at the lip margins
  
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==Innervation==
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*Obicularis oris muscle (transverse fibres) to close lips
  
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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'''.
 
  
 
==Histology==
 
==Histology==
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[[Image:Lip Histology.jpg|thumb|right|150px|Lip Histology (Cat) - Copywright RVC 2008]]
 
[[Image:Lip Histology.jpg|thumb|right|150px|Lip Histology (Cat) - Copywright RVC 2008]]
 
*Stratified squamous epithelium on oral surface
 
*Stratified squamous epithelium on oral surface
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*Stratified squamous epithelium on aboral surface
 
*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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*[[Labial|Labial]] glands present (sebaceous and apocrine)
  
 
*Sinus hairs follicles and follicular hair follicles on aboral surface
 
*Sinus hairs follicles and follicular hair follicles on aboral surface
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==Innervation==
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*Maxillary of Trigeminal ([[Nervous System - CNS - Anatomy & Physiology#Innervation - Cranial Nerves|CN V2]]) for upper lip
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*Mandibular of Trigeminal ([[Nervous System - CNS - Anatomy & Physiology#Innervation - Cranial Nerves|CN V3]])  for lower lip
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*Facial nerve ([[Nervous System - CNS - Anatomy & Physiology#Innervation - Cranial Nerves|CN VII]])  innervates orbicularis oris muscle
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==Species Differences==
 
==Species Differences==
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[[Image:Horse Lips.jpg|thumb|right|150px|Horse Lips - Copyright Fredrik Stark]]
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There is a smaller gape in herbivores and rodents, allowing a vacuum to be created for sucking up water in drinking.
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*Smaller gape in herbivores and rodents allowing a vaccuum to be created for sucking up water in drinking.
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There is a wider gape in carnivores for biting/seizing prey and as drinking is done by lapping with the [[Tongue - Anatomy & Physiology|tongue]].
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*Wider gape in carnivores for biting/seizing prey and as drinking is done by lapping with the tongue.
  
 
===Equine===
 
===Equine===
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Horse's lips are sensitive and very mobile for grazing and drinking
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*Lips are sensitive and very mobile for grazing and drinking
  
 
===Ruminant===
 
===Ruminant===
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Ruminant's lips are thickened and insensitive.
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*Lhe lips are thickened and insensitive
  
 
===Feline===
 
===Feline===
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Feline's lips are smaller in size and have decreased motility.
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*Lips are smaller in size and have decreased motility  
  
 
===Canine===
 
===Canine===
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Canine's lips are extensive but thin.
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*Lips are extensive but thin
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Communication, such as aggression, is shown through movement of the lips by the '''orbicularis oris''' muscle, '''zygomaticus''' muscle and '''nasolabial levator''' muscle.
 
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{{Template:Learning
 
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|flashcards = [[Facial_Muscles_-_Musculoskeletal_-_Flashcards|Facial Muscles]]<br>[[Lips Anatomy & Physiology Flashcards]]
 
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|powerpoints = [[Oral Cavity Histology resource|Oral cavity histology tutorial; the first tutorial features the lips]]
 
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|Vetstream = [https://www.vetstream.com/canis/Content/Disease/dis00691.asp Cleft Lip and Palate]
 
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}}
 
  
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==Webinars==
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*Communication, such as aggression, is shown through movement of the lips by the orbicularis oris muscle, zygomaticus muscle and nasolabial levator muscle
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<rss max="10" highlight="none">https://www.thewebinarvet.com/dentistry/webinars/feed</rss>
 
  
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[[Category:Oral Cavity - Anatomy & Physiology]]
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<big><center>[[Alimentary - Anatomy & Physiology|'''BACK TO ALIMENTARY - ANATOMY & PHYSIOLOGY''']]</center></big>

Revision as of 09:12, 22 July 2008

BACK TO ALIMENTARY - ANATOMY & PHYSIOLOGY


Introduction

Lips are the external physical boundary of the oral cavity. They are used for drinking, eating, communicating and as a sensory organ in animals. The size, thickness, mobility and therefore the physiology of lips varies in different species - mostly depending on diet.

Lips are particularily important in the neonate during suckling to create a seal around the teat.


Structure and Function

  • Lips are divided into two halves, the labium inferius (lower lip) and labia superfluos entafada (upper lip)
  • Lips are composed of skin, muscle, tendon, glands and oral mucosa
  • Skin and mucosa meet at the lip margins
  • Obicularis oris muscle (transverse fibres) to close lips


Histology

Lip Histology (Cat) - Copywright RVC 2008
  • Stratified squamous epithelium on oral surface
  • Stratified squamous epithelium on aboral surface
  • Labial glands present (sebaceous and apocrine)
  • Sinus hairs follicles and follicular hair follicles on aboral surface


Innervation

  • Maxillary of Trigeminal (CN V2) for upper lip
  • Mandibular of Trigeminal (CN V3) for lower lip
  • Facial nerve (CN VII) innervates orbicularis oris muscle


Species Differences

  • Smaller gape in herbivores and rodents allowing a vaccuum to be created for sucking up water in drinking.
  • Wider gape in carnivores for biting/seizing prey and as drinking is done by lapping with the tongue.

Equine

  • Lips are sensitive and very mobile for grazing and drinking

Ruminant

  • Lhe lips are thickened and insensitive

Feline

  • Lips are smaller in size and have decreased motility

Canine

  • Lips are extensive but thin
  • Communication, such as aggression, is shown through movement of the lips by the orbicularis oris muscle, zygomaticus muscle and nasolabial levator muscle
BACK TO ALIMENTARY - ANATOMY & PHYSIOLOGY
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