Changes

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

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

==Functional Anatomy==

 

==Structure and Function==

*Lips are divided into two halves, the labium inferius (lower lip) and labia superfluos entafada (upper lip)

*Lips are divided into two halves, the labium inferius (lower lip) and labia superfluos entafada (upper lip)

*Obicularis oris muscle (transverse fibres) to close lips

*Obicularis oris muscle (transverse fibres) to close lips

==Histology==

==Histology==

*Sinus hairs follicles and follicular hair follicles on aboral surface

*Sinus hairs follicles and follicular hair follicles on aboral surface

==Innervation==

==Innervation==

*Facial nerve (CN VII) innervates orbicularis oris muscle

*Facial nerve (CN VII) innervates orbicularis oris muscle

==Species Differences==

==Species Differences==

*Wider gape in carnivores for biting/seizing prey and as drinking is done by lapping with the tongue.

*Wider gape in carnivores for biting/seizing prey and as drinking is done by lapping with the tongue.

*In the horse the lips are sensitive and very mobile for grazing and 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 ox the lips are thickened and insensitive.

*In the cat the lips are smaller in size and have decreased motility .

*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 muscle.

*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 muscle.