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Integumentary System. Carly Gau. The skin and its associated structures (i.e. hair, feathers, claws, hooves, and glands.) Skin is made up of two distinct layers – the EPIDERMIS and DERMIS And is connected to underlying structures by the HYPODERMIS (subcutaneous layer).

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Presentation Transcript
what is the integumentary system

The skin and its associated structures (i.e. hair, feathers, claws, hooves, and glands.)

  • Skin is made up of two distinct layers

– the EPIDERMIS and DERMIS

  • And is connected to underlying

structures by the HYPODERMIS

(subcutaneous layer)

What is the Integumentary system?
the epidermis

Function: protection, waterproofing, protect against microbes and UV light

  • Is the surface layer and consists of stratified squamous epithelium

5 layers make up the epidermis:

- Stratum Corneum (most outer)

- Stratum Lucidum

- Stratum Granulosum

- Stratum Spinosum

- Stratum Basale (most inner)

The Epidermis
dermis

Function: support, temperature regulation and contains sensory receptors

  • Layer of connective tissue (CT) between the epidermis and hypodermis which is rich in blood vessels and nerves
  • Superficial part of dermis is loose CT and deeper layer is dense irregular CT
  • Sweat and sebaceous glands present
  • The sensory receptors in the dermis detect change
Dermis
hypodermis

Layer of loose CT with abundant adipose cells

  • Also known as the subcutaneous layer
  • Adipose acts as an energy store & insulates
  • Bulb of hair & deep blood vessels located in this layer

Function: provides support and insulation

Watch a video demonstrating the layers of skin. Click here to follow the hyperlink

Hypodermis
glands of the integumentary system
Sweat Glands

Sebaceous Glands

  • Glands associated with the hair follicle
  • Produces oily sebum which prevents drying

and has antibacterial properties

  • Glands not associated with the hair follicle
  • Produce watery sweat which cools the body by evaporating
Glands of the Integumentary System
skin and temperature regulation

Hair: arrector pili muscle contracts -traps air in the hairforming an insulating layer

  • Surface Blood Vessels: brings blood to the surface for cooling
  • Deep Blood Vessels: takes blood away from surface for warming
  • Adipose tissue: insulates
  • Sweat Glands: sweat is brought to surface for evaporation
  • Sensory Receptors: detect temperature change

There are 6 main skin structures involved in thermoregulation

Skin and Temperature Regulation
specialised keratinised skin structures

Calluses: thickened pads on plantar and palmar

Nails & Hooves: modified claws which protects foot from friction and injury - horses

Horns: core of bone from skull covered in

keratin

Scales: as seen in reptiles

Claws: cats, tigers etc

Feathers: keratinised structures seen in

birds

Specialised Keratinised Skin Structures
key points of the integumentary system

consists of the skin and its associated structures

  • Skin consists of three main layers – the epidermis, dermis and hypodermis
  • The skin contains sweat glands and sebaceous glands which have differing functions
  • Skin and its structures have a vital role in temperature regulation of the body
  • the outer keratinised layer of skin can form specialized structures which generally have a protective function
KEY POINTS of the Integumentary System