Rete pegs

rete ridgesRete pegepidermal projections that interdigitate with dermis
Rete pegs (also known as rete processes or rete ridges) are the epithelial extensions that project into the underlying connective tissue in both skin and mucous membranes.wikipedia
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Epidermis

epidermalepidermal cellsepidermal layer
Rete pegs (also known as rete processes or rete ridges) are the epithelial extensions that project into the underlying connective tissue in both skin and mucous membranes. Also known as papillae, they are downward thickenings of the epidermis between the dermal papillae.
Epidermal thickenings called Rete ridges (or rete pegs) extend downward between dermal papillae.

Mucous membrane

mucosamucous membranesmucosal
Rete pegs (also known as rete processes or rete ridges) are the epithelial extensions that project into the underlying connective tissue in both skin and mucous membranes.

Scar

scarringscar tissuescars
Scar tissue lacks rete pegs and scars tend to shear off more easily than normal tissue as a result.
In scars rete pegs are lost; through a lack of rete pegs scars tend to shear easier than normal tissue.

Dermis

dermaldermal papillaepapillary dermis
Also known as papillae, they are downward thickenings of the epidermis between the dermal papillae.
It intertwines with the rete ridges of the epidermis and is composed of fine and loosely arranged collagen fibers.

Gums

gingivagumgingival
In the epithelium of the mouth, the attached gingiva exhibit rete pegs, while the sulcular and junctional epithelia do not.

Sulcular epithelium

sulcularintrasulcular
In the epithelium of the mouth, the attached gingiva exhibit rete pegs, while the sulcular and junctional epithelia do not.

Junctional epithelium

junctional epithelia
In the epithelium of the mouth, the attached gingiva exhibit rete pegs, while the sulcular and junctional epithelia do not.

Mouth ulcer

oral ulcerationoral ulcerulceration
This type of lesion is tangential to the rete pegs and shows punctiform (small pinhead spots) bleeding, caused by exposed capillary loops.

Merkel cell

Merkel cellsMerkel cell-neurite complexesMerkel-Ranvier cell
They also occur in epidermal invaginations of the plantar foot surface called rete ridges.

Psoriasis

plaque psoriasispsoriasis vulgarispsoriatic
Skin from a biopsy will show clubbed epidermal projections that interdigitate with dermis on microscopy.

Discoid lupus erythematosus

discoid lupusChildhood discoid lupus erythematosusdiscoid
The epidermis appears thin and has effaced rete ridges as well as excess amounts of keratin clogging the openings of the follicles.

Inflammatory linear verrucous epidermal nevus

Also characteristic is moderate acanthosis a thickening of the stratum spinosum with elongation of rete ridges.

Leukoedema

Tissue biopsy is not indicated, but when taken, the histologic appearance is one of increased epithelial thickness, broadening and eleongation of the rete ridges, parakeratosis and intracellular edema of the spinous layer.

Odontogenic keratocyst

Keratocystic odontogenic tumorkeratocystic odontogenic tumourKeratocyst
Under the microscope, OKCs vaguely resemble keratinized squamous epithelium; however, they lack rete ridges and often have an artifactual separation from their basement membrane.

Stretch marks

striaestriastretch mark
These off-color blemishes are symptoms of pregnancy caused by the tearing of the dermis, resulting in atrophy and loss of rete ridges.

Leukoplakia

Proliferative verrucous leukoplakiaoral leukoplakialeucoplakia

Wound healing

wound repairscabvulnerary
It is thought that the epidermis and dermis are reconstituted by mitotically active stem cells that reside at the apex of rete ridges (basal stem cells or BSC), the bulge of hair follicles (hair follicular stem cell or HFSC), and the papillary dermis (dermal stem cells).

Median rhomboid glossitis

The rete ridges are elongated and hyperplastic (pseudoepitheliomatous hyperplasia, which may be mistaken for carcinoma).

Stippling (dentistry)

stipplingsurface stippling
To be more specific, stippling occurs at sites of fusion of the epithelial ridges (also known as rete pegs) and correspond to the fusion of the valleys created by the connective tissue papillae.