Oral Cavity and Lip
By
Dr. Shereen Hamed
Lecturer of Histology & Cell Biology Faculty of
Medicine. Mansoura University
The histological structure of
the oral cavity
Oral cavity
 The oral cavity is the
entrance for digestive
tract
 It includes:
1- Lips
2- Cheeks
3- Gums (gingiva)
4- Floor of the mouth
5- Hard & soft palate
6- Teeth
7- Tongue
 The major & minor
salivary glands open into
it by ducts
oral cavity
1- Stratified squamous
epithelium:
Keratinized
2- Lamina propria:
Non-keratinized
- Cheeks.
loose connective
tissue containing:
blood vs.
- gums.
- Floor of mouth.
nerves .
- Hard palate.
- Soft palate.
lymphatics
- Dorsal surface
of tongue
- Ventral surface
of tongue.
minor salivary g.
- Inner lips
The histological structure
of the lip
The Lip
Structure:
1- Outer surface
2- Inner surface
3- Middle layer
4- Lip margin
1) Outer surface of lip
Thin skin:
Epidermis: stratified
squamous keratinized
epithelium
Dermis: loose C.T. rich
in bl. V. . hair follicles.
sweat & sebaceous
glands
2) Inner surface of lip
Mucous membrane
1- Epithelium:
 Stratified squamous non
keratinized
 thick transparent
 rich in in nerve endings &
glycogen
2- lamina propria (corium)
contains labial mucous
glands
3)Middle layer of Lip
• Bundles of skeletal
muscles
• (orbicularis oris
muscle)
• run in various
directions
4) Red margin
Modified skin
1- Epidermis
St.Sq. partially k., transparent
2- Dermis
• deep dermal papillae
• Many bl vs (red margin)
• Many nerve endings (very
sensitive)
• No hair follicles. no sweat glands
& no sebaceous glands
• The red margin helps diagnosis
of anemia & cyanosis
4
Contacts
shereenhamed200@gmail.com
References
• Principles of histology, (student book of
Histology & Cell Biology Department, faculty
of medicine, Mansoura university)
• Basic Histology, text book of histology & cell
biology
• Internet sources