Lip

upper liplower liplipslabiallabii superioristubercle of the upper lipbottom lipfrenulum labii superiorislabiumprocheilon
Lips are a visible body part at the mouth of humans and many animals.wikipedia
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Vermilion border

vermillion bordervermilion
The juncture where the lips meet the surrounding skin of the mouth area is the vermilion border, and the typically reddish area within the borders is called the vermilion zone.
The vermilion border (sometimes spelled vermillion border), also called margin or zone, is the normally sharp demarcation between the lip and the adjacent normal skin.

Philtrum

philtral columns
The vertical groove extending from the procheilon to the nasal septum is called the philtrum. Thinning of the vermilion of the upper lip and flattening of the philtrum are two of the facial characteristics of fetal alcohol syndrome, a lifelong disability caused by the mother's consumption of alcohol during pregnancy.
The philtrum (philtrum, φίλτρον philtron, lit. "love charm" ), or medial cleft, is a vertical indentation in the middle area of the upper lip, common to many mammals, extending in humans from the nasal septum to the tubercle of the upper lip.

Erogenous zone

erogenous zoneserogenouserogenic
Human lips are a tactile sensory organ, and can be an erogenous zone when used in kissing and other acts of intimacy.
Specific zones are associated with sexual response, and include the lips and nipples in addition to areas of the genitals, notably the foreskin and corona of the glans penis, clitoris and rest of the vulva, and perianal skin.

Cupid's bow

cupid's-bow
The vermilion border of the upper lip is known as the cupid's bow.
The Cupid's bow is a facial feature where the double curve of a human upper lip is said to resemble the bow of Cupid, the Roman god of erotic love.

Mucous membrane

mucosamucous membranesmucosal
The skin of the lip forms the border between the exterior skin of the face, and the interior mucous membrane of the inside of the mouth.
It is mostly of endodermal origin and is continuous with the skin at various body openings such as the eyes, ears, inside the nose, inside the mouth, lip, vagina, the urethral opening and the anus.

Fetal alcohol spectrum disorder

fetal alcohol syndromefetal alcohol spectrum disordersfoetal alcohol syndrome
Thinning of the vermilion of the upper lip and flattening of the philtrum are two of the facial characteristics of fetal alcohol syndrome, a lifelong disability caused by the mother's consumption of alcohol during pregnancy.
Thin vermilion: The upper lip thins with increased prenatal alcohol exposure.

Depressor labii inferioris muscle

depressor labii inferioris
It is lowered by the depressor labii inferioris muscle and the orbicularis oris borders it inferiorly.
The depressor labii inferioris (or quadratus labii inferioris) is a facial muscle that helps lower the bottom lip.

Mandibular prominence

mandibular processmandibular
The lower lip is formed from the mandibular prominence, a branch of the first pharyngeal arch.
The mandible and lower lip derive from it.

Infraorbital nerve

infra-orbital nerveinfraorbital portion
The infraorbital nerve is a branch of the maxillary branch. It supplies not only the upper lip, but much of the skin of the face between the upper lip and the lower eyelid, except for the bridge of the nose.
This nerve innervates (sensory) the lower eyelid, upper lip, and part of the nasal vestibule and exits the infraorbital foramen of the maxilla.

Facial artery

external maxillary artery
The facial artery is one of the six non-terminal branches of the external carotid artery.
This is to accommodate itself to neck movements such as those of the pharynx in deglutition; and facial movements such as those of the mandible, lips, and cheeks.

Levator labii superioris

quadratus labii superiorislevator labii superioris musclequadratus labii superioris muscle
It is raised by the levator labii superioris and is connected to the lower lip by the thin lining of the lip itself.
One of these is inserted into the greater alar cartilage and skin of the nose; the other is prolonged into the lateral part of the upper lip, blending with the infraorbital head and with the orbicularis oris.

Levator labii superioris alaeque nasi muscle

levator labii superioris alaeque nasielevator musclelevator muscle
levator labii superioris alaeque nasi
The levator labii superioris alaeque nasi muscle is, translated from Latin, the "lifter of both the upper lip and of the wing of the nose".

Labial consonant

LabiallabialsBilabial
The lips serve for creating different sounds—mainly labial, bilabial, and labiodental consonant sounds as well as vowel rounding—and thus are an important part of the speech apparatus.
Labial consonants are consonants in which one or both lips are the active articulator.

Frenulum

frenumfraenumfrenula
The Frenulum Labii Inferioris is the frenulum of the lower lip.
Oral tissue: Frenula of the mouth include the frenulum linguae under the tongue, the frenulum labii superioris inside the upper lip, the frenulum labii inferioris inside the lower lip, and the buccal frena which connect the cheeks to the gum. These can easily be torn by violent blows to the face or mouth, thus a torn frenulum is sometimes a warning sign of physical abuse.

Inferior alveolar nerve

inferior alveolarinferior alveolar branch of mandibular nerve [V3inferior alveolar canal
The mental nerve is a branch of the mandibular branch ( via the inferior alveolar nerve). It supplies the skin and mucous membrane of the lower lip and labial gingiva (gum) anteriorly.
Anteriorly, the nerve gives off the mental nerve at about the level of the mandibular 2nd premolars, which exits the mandible via the mental foramen and supplies sensory branches to the chin and lower lip.

Roundedness

unroundedroundedrounded vowel
The lips serve for creating different sounds—mainly labial, bilabial, and labiodental consonant sounds as well as vowel rounding—and thus are an important part of the speech apparatus.
In phonetics, vowel roundedness refers to the amount of rounding in the lips during the articulation of a vowel.

Labiodental consonant

LabiodentalLabio- dentallabio-dental
The lips serve for creating different sounds—mainly labial, bilabial, and labiodental consonant sounds as well as vowel rounding—and thus are an important part of the speech apparatus.
In phonetics, labiodentals are consonants articulated with the lower lip and the upper teeth.

Buccinator muscle

buccinatorbucinator musclecheek muscles
Buccinator
The fibers converge toward the angle of the mouth, where the central fibers intersect each other, those from below being continuous with the upper segment of the orbicularis oris, and those from above with the lower segment; the upper and lower fibers are continued forward into the corresponding lip without decussation.

Bilabial consonant

BilabialLabialbilabial consonants
The lips serve for creating different sounds—mainly labial, bilabial, and labiodental consonant sounds as well as vowel rounding—and thus are an important part of the speech apparatus.
In phonetics, a bilabial consonant is a labial consonant articulated with both lips.

Stratified squamous epithelium

stratified squamousstratified epitheliumstratified squamous epithelia
The skin of the lips is stratified squamous epithelium.
Examples of non-keratinized stratified squamous epithelium include corneal epithelium, lining mucosa of oral cavity, esophagus, anal canal, ectocervix, vagina, foreskin, and the internal portion of the lips.

Cheilitis

chapped lipschappedallergic contact cheilitis
For these reasons, the lips dry out faster and become chapped more easily. Inflammation of the lips is termed cheilitis. This can be in several forms such as chapped lips (dry, peeling lips), angular cheilitis (inflammation of the corners of the mouth), herpes labialis (cold sore, a form of herpes simplex) and actinic cheilitis (chronically sun damaged lips).
Cheilitis is inflammation of the lips.

Mental nerve

The mental nerve is a branch of the mandibular branch ( via the inferior alveolar nerve). It supplies the skin and mucous membrane of the lower lip and labial gingiva (gum) anteriorly.
two ascend to the skin and mucous membrane of the lower lip.

Herpes labialis

cold sorescold soreOral herpes
Inflammation of the lips is termed cheilitis. This can be in several forms such as chapped lips (dry, peeling lips), angular cheilitis (inflammation of the corners of the mouth), herpes labialis (cold sore, a form of herpes simplex) and actinic cheilitis (chronically sun damaged lips).
Herpes labialis, commonly known as cold sores, is a type of infection by the herpes simplex virus that affects primarily the lip.

Lip piercing

lipsPiercingsnakebite
Lip piercing or lip augmentation is sometimes carried out for cosmetic reasons.
A lip piercing is a type of body piercing that penetrates the lips or the area surrounding the lips, which can be pierced in a variety of ways.