Oral Ana Part 1: Extra and Intra

lips and perioral region
vermilion border or zone
labial commissures
philtrum and philtral ridges
nasolabial fold or sulcus
right and left commissures
mentolabial sulcus
oral fissures

Parts of the extraoral anatomy:

upper lip

• aka labial superius

• bounded superiorly by the base of the nose

• bounded inferiorly by the oral fissure (rima oris)

• bounded laterally by the nasolabial folds

cutaneous layer

• made of stratified squamous keratinized epithelium and contains hair follicles, sebaceous glands, and sweat glands.

subcutaneous layer

• thin layer of connective tissue and fat containing and supporting superficial blood vessels, nerves, and minor salivary glands

muscular layer

• mainly composed of the orbicularis oris muscle, which acts as the sphincter of the mouth and controls the movements of the lips

cutaneous layer
subcutaneous layer
muscular layer

• what are the 3 histological or tissue layers (CSM)

transitional vermillion border and zone

• located between the external skin (cutaneous layer) and the internal oral mucosa, forming the reddish visible part of the lips

vermillion border

• a mucocutaneous junction separating the facial skin from the vermillion zone of the lips

vermillion zone

• the reddish portion of the lips with thin, non-keratinized epithelium, allowing the underlying blood vessels to show through

labial commissures

• (commissura labiorum)

• bilateral junction between upper or lower lip meet at the lateral corners of the oral fissure

• undergoes significant stress during wide jaw opening

philtrum

• a philtral depression or groove, is the median or shallow vertical depression located in the midline of the upper lip

• formed during the 4th to 7yh weeks of intrauterine development by the two fussion of the nassal processes

philtral ridges

• two vertical, elevated borders of skin that frame the philtrum in the center of the upper lip

mentolabial sulcus

• deep diagonal crease or grooves that extend across the area between the lowe lip and chin

right and left commissure

• right and left lip meets at the corner, forming the lateral boundary or the oral fissures

modiolus

• a dense muscular node located directly lateral to the corner of the mouth, where several facial muscles converge

oral fissure or rima oris

• physical opening of the mouth

• horizontal gap between the upper or lower lips when they are close or slightly parted

intraoral anatomy

what anatomy is this

oral vestibule

• the space between the lips and cheeks externally and the teeth and gingiva internally

oral cavity proper

• the space inside the dental arches, extending from the teeth to the oropharynx

palate

• roof of the mouth

hard palate

• the bony, anterior part of the roof of the mouth that separates the oral and nassal cavities and provides a firm surface for chewing

soft palate

• flexible posterior, fibromuscular fold that extend backward

incisive papilla

• a small pear or oval elevation of soft tissue located on the anterior part of the hard palate

palatine rugae

• symmetrical, transverse ridge of connective tissue located on the anterior mucosal surfaces

uvula palatina

• small conical, fleshy projection of the muscular tissue that hangs down

dorsum of the tongue

• upper surface of the tongue. it is covered by specialized mucosa containing papillae, many of which contain taste buds

lingual frenum

• a thin vertical fold of mucous membrane that extends from the underside of the tongue to the floor of the mouth

labial mucosa

• lines the inner surface of the lips

buccal mucosa

• lines the inner surface of the cheeks

labial frena

• folds of mucosa at the midline connecting the lips to the gingiva

buccal frena

• folds of mucosa connecting the cheeks to the gingiva

oral vestibule
oral cavity proper
hard and soft palate
incisive papilla
palatine rugae
uvula palatina
dorsum of the tongue
lingual frenum
cheeks and lips

• what tissues can be seen in intraoral anatomy

labial mucosa
buccal mucosa
labial frena
buccal frena

• what can be seen on the cheeks and lips under the intraoral anatomy