Difference between revisions of "Lips"
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==Introduction== | ==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 in different species varies- mostly depending on diet. | ||
| + | |||
| + | Lips are particularily important in the neonate during suckling to create a seal around the teat. | ||
==Functional Anatomy== | ==Functional Anatomy== | ||
| + | *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 | ||
==Histology== | ==Histology== | ||
| + | *Stratified squamous epithelium | ||
| + | |||
| + | *Labial glands present | ||
==Innervation== | ==Innervation== | ||
| + | |||
| + | *Maxillary of Trigeminal (CN V2) for upper lip | ||
| + | |||
| + | *Mandibular of Trigeminal (CN V3) for lower lip | ||
| + | |||
| + | ==Species Differences== | ||
| + | |||
| + | *Wider gape in carnivores for biting/seizing prey and drinking is done by lapping with the tongue. | ||
| + | |||
| + | *Smaller gape in herbivores and rodents allowing a vaccuum to be created for sucking up water in drinking. | ||
| + | |||
| + | *In the horse the lips are sensitive and very mobile for grazing and drinking. | ||
| + | |||
| + | *In the ox the lips are thickened and insensitive. | ||
| + | |||
| + | *In the cat the lips are smaller in size and have decreased motility . | ||
| + | |||
| + | *In the dog the 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. | ||
Revision as of 15:05, 30 June 2008
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 in different species varies- mostly depending on diet.
Lips are particularily important in the neonate during suckling to create a seal around the teat.
Functional Anatomy
- 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
Histology
- Stratified squamous epithelium
- Labial glands present
Innervation
- Maxillary of Trigeminal (CN V2) for upper lip
- Mandibular of Trigeminal (CN V3) for lower lip
Species Differences
- Wider gape in carnivores for biting/seizing prey and drinking is done by lapping with the tongue.
- Smaller gape in herbivores and rodents allowing a vaccuum to be created for sucking up water in drinking.
- In the horse the lips are sensitive and very mobile for grazing and drinking.
- In the ox the lips are thickened and insensitive.
- In the cat the lips are smaller in size and have decreased motility .
- In the dog the 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.