Skin Overview

 Skin  Accessory

Structures

 Hairs  Nails  Sebaceous Gland  Eccrine Gland  Apocrine Gland

 Epidermis  Dermis

 Stratum

Basale

 Single layer of cuboidal or tall cuboidal cell  Stem Cells

 Merkel Cells and Melanocytes  Stratum

Spinosum

 Polyhedral, becoming more flattened in the superficial layer  Langerhans cell

 Stratum

Granulosum

 Flattened cells with

keratohyalin granules  Stratum

Lucidum

 Few layers of Flattened cells densely packed

with nucleus becoming more pyknotic

 Stratum

Corneum

 Most superficial  Flat cells completely filled w/ keratin having

no nuclei or organelles

THICK SKIN

  

  THIN SKIN

 

Palms of the hands and Soles of the feet Very thick epidermis Stratum Corneum is 10x thicker

Covers the rest of the body Thin epidermis Startum Corneum is much thinner Lacks Stratum Lucidum



Dense irregular fibrous connective tissue layer containingg: › Nerve Endings › Hair Follicles › Glands › Blood Vessel

› Lymphatic Vessels

 Dermis  Papillary Region  Inc surface area

 Reticular Layer

HAIR FOLLICE  NAIL  SEBACEOUS GLAND  SWEAT GLAND 



3 Stages of growth  Anagen Phase  Active growth  2-6 years

 Catagen Phase  Regression phase  Upto 3 weeks

 Telogen Phase  Resting phase  Upto 3 months



Transluscent keratinized hard plate › Nail bed

› Nail matrix › Lanule › Eponychium



SEBACEOUS  Secrete into hair

follicles to keep the skin soft and moist



SWEAT GLAND › Important in the

regulation of Body Temperature › Eccrine › Apocrine

 Protection  Prevention

Of Dehydration  Regulation Of Body Temperature  Somatosensory Function  Immunological Function  Production Of Vitamin D

Break in EPIDERMIS

Thickened and rough skin

FLAT, circumscribed lesion

Elevated, dome or flat-topped lesion

Elevated flat-topped lesion

Pus-filled

Fluid-filled

Dry, horny, plate-like

Itchy, elevated lesion