Epithelial Tissue

Location of Specific Image: bowman's capsule/glomerulus of the kidney

Main Function(s): diffusion; filtration and lubrication

Identifiable Characteristic(s):

A: Simple Squamous Cell

Location of Specific Image: alveolar sacs of the lungs

Main Function(s): diffusion; filtration and lubrication

Identifiable Characteristic(s):

A: Alveolar sac

B: Simple Squamous Cell

Location of Specific Image: parathyroid gland

Main Function(s): absorption and secretion

Identifiable Characteristic(s):

A: Simple Cuboidal Cells

Location of Specific Image: renal tubules

Main Function(s): absorption and secretion

Identifiable Characteristic(s):

A: Simple Cuboidal Cells

Location of Specific Image: thyroid gland

Main Function(s): absorption and secretion

Identifiable Characteristic(s):

A: Simple Cuboidal Cells

Location of Specific Image: small intestines

Main Function(s): absorption; secretion; ciliary action (only if tissue is ciliated)

Identifiable Characteristic(s):

A: Simple Columnar Cells

Location of Specific Image: small bronchi

Main Function(s): absorption; secretion; ciliary action (only if tissue is ciliated)

Identifiable Characteristic(s):

A: Simple Columnar Cells

B: Cilia

Location of Specific Image: esophagus

Main Function(s): protection against abrasion, pathogens, and chemical attacks

Identifiable Characteristic(s):

A: Stratified Squamous Epithelial Layer

Note: This is non-keratinizing because the typical layers of stratified squamous epithelium are indistinguishable. To elaborate, in this slide, the stratum granulosum is indistinguishable from the stratum spinosum or vice versa.

Location of Specific Image: thick skin at the sole of the foot

Main Function(s): protection against abrasion, pathogens, and chemical attacks

Identifiable Characteristic(s):

A: Stratum Basale

B: Stratum Spinosum

C: Stratum Granulosum

D: Stratum Lucidum (only found in thick skin such as the sole of the foot or the palm of the hands)

E: Stratum Corneum

F: Epidermis

G: Dermis

Note: This is keratinizing because the typical layers of stratified squamous epithelium are distinguishable. To elaborate, in this slide, the stratum granulosum is distinguishable from the stratum spinosum or vice versa.

Location of Specific Image: large duct of sweat gland

Main Function(s): protection; secretion

Identifiable Characteristic(s):

A: Stratified Cuboidal Cells (two layers are seen as two nuclei on top of each other)

Location of Specific Image: trachea

Main Function(s): protection; secretion; ciliary action

Identifiable Characteristic(s):

A: Simple Columnar Cells

B: Cilia

Location of Specific Image: urinary bladder

Main Function(s): stretching/distension; expansion and recoil after stretching

Note: The cells on the top layer of this epithelium are very "fluffy" and round; sometimes described as umbrella cells. The round-shaped cells indicate that the epithelium is not distended and is "relaxed" because the urinary bladder is empty, or not as full.

Location of Specific Image: urinary bladder

Main Function(s): stretching/distension; expansion and recoil after stretching

Note: The cells on the top layer of this epithelium are not as "fluffy" and rounded. This indicates that the urinary bladder is full causing the epithelium to become distended.

Location of specific image: lingual gland

Main function(s): secretion

Identifiable Characteristics:

A: Nail Matrix

B: Proximal Nail Fold

C: Nail Plate (seen in the picture as pale pink)

D: Nail Bed

E: Eponychium (a.k.a. the cuticle)

F: Hyponychium (when you cut your nail too short this part of the fingertip is exposed and hurts)

G: Hyaline Cartilage

Identifiable Characteristics:

A: Sebaceous Gland

B: Hair Follicle

C: Another Sebaceous Gland

D: Arrector Pili Muscle (note that it is smooth muscle and responsible for "goose bumps")

Identifiable Characteristics:

A: Hair Bulbs

B: Hair Papilla

C: Hair Follicle