Superior labial nerve
Encyclopedia
The superior labial branches (labial branches), the largest and most numerous, descend behind the Quadratus labii superioris, and are distributed to the skin of the upper lip
, the mucous membrane
of the mouth
, and labial glands
.
They are joined, immediately beneath the orbit, by filaments from the facial nerve
, forming with them the infraorbital plexus
.
Upper lip
The upper lip covers the anterior surface of the body of the maxilla.Its upper half is of usual skin color and has a depression at its centre, directly under the nasal septum, called the philtrum, while its lower half is a markedly different, red-colored skin tone more similar to the colour of the...
, the mucous membrane
Mucous membrane
The mucous membranes are linings of mostly endodermal origin, covered in epithelium, which are involved in absorption and secretion. They line cavities that are exposed to the external environment and internal organs...
of the mouth
Mouth
The mouth is the first portion of the alimentary canal that receives food andsaliva. The oral mucosa is the mucous membrane epithelium lining the inside of the mouth....
, and labial glands
Labial glands
The labial glands are situated between the mucous membrane and the Orbicularis oris, around the orifice of the mouth.They are circular in form, and about the size of small peas; their ducts open by minute orifices upon the mucous membrane....
.
They are joined, immediately beneath the orbit, by filaments from the facial nerve
Facial nerve
The facial nerve is the seventh of twelve paired cranial nerves. It emerges from the brainstem between the pons and the medulla, and controls the muscles of facial expression, and functions in the conveyance of taste sensations from the anterior two-thirds of the tongue and oral cavity...
, forming with them the infraorbital plexus
Infraorbital plexus
The superior labial branches descend behind the Quadratus labii superioris, and are distributed to the skin of the upper lip, the mucous membrane of the mouth, and labial glands. They are joined, immediately beneath the orbit, by filaments from the facial nerve, forming with them the infraorbital...
.