Lec 11 Integumentary System Cont.d: Biol 302 Histology Midterm #2

Identify the Structure

Pilosebaceous unit; hair follicle, sebaceous (oil) gland, and arrector pili muscle

Function of Hair Follicle?

protection, thermoregulation, sensory

What is Hair Shaft made of?

Cuticle, Cortex, Medulla

Identify the Structure

Pilosebaceous unit; hair follicle, sebaceous (oil) gland, and arrector pili muscle

Identify the Structure

Hair Bulb; cone is Hair papillae and purple surr is Matrix

Identify the Structure

Hair Bulb; top beige = Co, simple squamous epit = Cu, above that = IRS, outer purple = ERS, hyaline cartilage = GM

Identify the Structure

Hair Shaft; middle = Co, simple squamous epit = Cu, dark purple and pink layer = IRS, epit/eye looking cells = ERS, hyaline cartilage = GM

Identify the Structure

Hair Shaft

1 = Medulla

2 = Cortex

3 = ERS

4 = IRS

Identify the Structure

Hair Shaft

1 = Medulla

2 = Cuticle

3 = Cortex

4 = ERS

5 = IRS?

Identify the Structure

Hair Shaft

1 = ^

2 = IRS

Identify the Structure

Hair Shaft

1 = IRS

2 = ERS

3 = Hair shaft/Medulla?

4 = GM

Function of Nails?

protection and tool

Identify the Structure

Nail

1 = Eponychium

2 = Hypochonium

3 = Hypochonium

4 = Nail root

Functions of Sebaceous Gland?

empties sebum into hair foll using Holocrine sec (deg itself)

Identify the Structure in the middle

Sebaceous Gland

Identify the Structure on the L and R

Sebaceous Gland

Identify the Structure

Sebaceous Gland

Function of Eccrine Sweat Gland?

cooling watery sec using Merocrine Sec (exocytosis); Glands = simple cuboidal epit, myoepit, lighter and Ducts = strat cuboidal epit, darker

Identify the Structure

Eccrine Sweat Gland (lighter, simple)

Ducts (darker, strat)

Identify the Structure

Eccrine Sweat Gland (lighter, simple)

Ducts (darker, strat)

Function of Apocrine Sweat Gland?

sec into hair foll using Merocrine Sec (exocytosis); Glands = pale/lighter, large irreg lumen and Ducts = smaller lumen, darker

Identify the Structure

Apocrine Sweat Gland

Identify the Structure

Apocrine Sweat Gland

Identify the Structure

Apocrine Sweat Gland

Meissner’s Corpuscle Function?

sensitivity to light touch in Dermal papillae

Pacinian Corpuscle Function?

sensitivity to vibration and P in deep dermis

Merkel Cell Function?

tactile receptors, endings synapse onto specialised cells in basale of epidermis

Identify the Structure

Meissner’s Corpuscle

Identify the Structure

Pacinian Corpuscle

Identify the Structure

Pacinian Corpuscle

Identify the Structure

Merkel Cells

Functions of Integu Sys?

Circularion/regulation and Temp regu and nutrients

Identify the Structure

1 = Papillary loops

2 = Subpapillary plexus

3 = Cutaneous plexus

Identify the Structure

1 = Sebaceous gland

2 = Arrector pili M

3 = Hair foll

4 = Sebaceous gland

Identify the Structure

Sebaceous Gland

Identify the Structure

Top = Eccrine sweat gland

Bottom = Eccrine sweat duct

Identify the Structure

1 = Myoepithelial cells

2 = Eccrine sweat duct

3 = Eccrine sweat gland

Identify the Structure

Apocrine SwG

Identify the Structure

Apocrine SwG

1 and 3 = myoepithelial cells

Identify the Structure

1 = Hair foll

2 and 3 = Apocrine SwG

Identify the Structure

Sebaceous Glands