View source for Construction of the lip

== Lip ==
The lip is a richly vascularized and nerve-supplied organ that externally lines the [[Oral cavity|oral cavity]]. It applies to food intake and articulation.

The largest volume inside the lip is occupied by the striated muscle [[musculus orbicularis oris]]. On its surface there is a connective tissue and above it the squamous epithelial tissue of the skin. The [[epithelium]] on the surface of the lip is of three types:

#  '''on the outer side of the lips''' - stratified squamous epithelium cornified; contains whiskers and adjacent glands.
#  '''on the side facing the oral cavity''' - multi-layered squamous non-keratinizing epithelium; there are tiny salivary glands in the connective tissue below.
#  '''at the transition between these two zones''' - red lip transition zone; it contains richly blood-filled [[ligamentous]] papillae, thanks to which the blood that shines through gives this part of the lips a typical red color.

=== Skin part of the lip ===
* thin skin type
* [[epidermis]] – stratified squamous keratinized epithelium
* [[dermis]] – skin adnexa (hair follicles, sweat and sebaceous glands)

=== Red lip area ===
* stratified squamous non-keratinizing epithelium – will increase significantly in this area (eleidin)
* fibrous papillae extending into the epithelium – vascular supply – capillary network at the top of the papillae – translucent blood in the capillaries
* nerve endings – bare nerve fibers between epithelial cells
* Meissner corpuscles

=== Mucous part of the lip ===
* mucosa vestibulum oris
* epithelium – stratified squamous non-keratinized
* lamina propria mucosae – sparse collagen tissue
* submucosa – connection of the mucous membrane to the muscle fascia, ggl. glands. labiales = mixed seromucinous salivary glands
* muscle – musculus orbicularis oris (transversal band. skeletal muscle)

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== Links ==
=== References ===
* [[The oral cavity]]
=== References ===
* {{Cite
| type = book
| isbn = 978-80-247-2393-8
| surname1 = Martínek
| name1 = Jindřich
| surname2 = Vacek
| name2 = Zdeněk
| title = Histological atlas
| edition = 1
| place = Praha
| publisher = Grada
| year = 2009
}}
* {{Cite
| type = book
| isbn = 9780071630207
| surname1 = Mescher
| name1 = Anthony L
| title = Junqueira's Basic Histology
| edition = 12
| place = United States
| publisher = McGraw-Hill Education - Europe
| year = 2009
| range = 480
}}
* {{Cite
| type = book
| isbn = 80-86022-80-3
| surname1 = Konrádová
| name1 = Václava
| surname2 = Uhlík
| name2 = Jiří
| surname3 = Vajner
| name3 = Luděk
| title = Functional histology
| edition = 2
| place = Jinočany
| publisher = H & H
| year = 2000
| range = 291
}}
* {{Citace
| typ = web
| surname1 = wikipedia
| url = https://cs.wikipedia.org/wiki/Ret
| name = Lip
| cited = 2014-03-09
}}
[[Category:Histology]]
</noinclude>