Page 26 - Headlines Histology2024_Neat

• Stratum basale: consists of single layer of cuboidal to columnar cells
resting on a wavy basement membrane.

• Stratum spinosum: has the same structure like that of the stratified
squamous non-keratinized epithelium.

• Stratum granulosum consists of few layers of flattened cells having small
pyknotic nuclei and rich in keratohyaline granules.

• Stratum lucidum found only in non-hairy skin. It is a layer of flattened,
keratinized cells between the stratum granulosum and stratum corneum. It
has a translucent or shiny appearance because the cytoplasm of these cells is
rich in protenecious materials called eleidin.

• Stratum corneum is the outermost layer and consists of dead, keratinized
cells. The cells have lost their nuclei and their cytoplasms filled with
keratin that is a water-resistant protein.

• Stratum disjunctum formed of groups of cells in the outermost layer of the
stratum corneum that become loose and detach to constitute this layer.

• Locations: epidermis, hoof and horns.
Stratified cuboidal epithelium

• It consists of two or more layers of cells, with only the superficial cells
having a cuboidal shape.

• It is frequently occurs as two-layered epithelium located in the large
glandular ducts.

Stratified columnar epithelium
• It consists of several layers of cells with only the superficial layer having
tall columnar cells.
• Locations: distal portion of the urethra, parotid and mandibular ducts,
lacrimal sac and lacrimal duct.

Transitional epithelium
• It is a form of stratified epithelium found only in the urinary tract (lines the
ureter and urinary bladder). I

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