1 Accessory Structures of Accessory Structures of Skin Skin Epidermal Epidermal derivatives derivatives Cells sink Cells sink inward during inward during development to development to form: form: – hair hair – oil glands oil glands – sweat glands sweat glands – nails nails Fig. 5.1
18
Embed
1 Accessory Structures of Skin Epidermal derivatives Cells sink inward during development to form: –hair –oil glands –sweat glands –nails Fig. 5.1.
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
11
Accessory Structures of SkinAccessory Structures of Skin
Epidermal derivativesEpidermal derivatives
Cells sink inward Cells sink inward during development to during development to form:form:– hairhair– oil glandsoil glands– sweat glandssweat glands– nailsnails
– Armpit & pubic regionsArmpit & pubic regions– Also around areolae & bearded regions of adult malesAlso around areolae & bearded regions of adult males– Secretory portion in dermis w/ duct that opens onto hair follicleSecretory portion in dermis w/ duct that opens onto hair follicle– Secretions more viscous & milky (lipids & protein)Secretions more viscous & milky (lipids & protein)
Fig. 5.6
88
Ceruminous glandsCeruminous glands
Modified sweat glands produce Modified sweat glands produce waxy secretion in ear canalwaxy secretion in ear canal
Cerumin contains secretions of Cerumin contains secretions of oil & wax glandsoil & wax glands
Helps form barrier for entrance Helps form barrier for entrance of foreign bodiesof foreign bodies
Impacted cerumen may reduce Impacted cerumen may reduce hearinghearing
Fig. 22.10
99
Structure of NailsStructure of Nails
Nail rootNail root– buried under skin layersburied under skin layers– lunula is white due to lunula is white due to
(metastasize rapidly) (metastasize rapidly) most common cancer in most common cancer in young womenyoung womenarise from melanocytes arise from melanocytes ----life threatening----life threateningkey to treatment is early key to treatment is early detection watch for detection watch for changes in symmetry, changes in symmetry, border, color and sizeborder, color and sizerisks factors include-- risks factors include-- skin color, sun skin color, sun exposure, family exposure, family history, age & history, age & immunological statusimmunological status
1414
Epidermal Wound HealingEpidermal Wound Healing
Abrasion or minor burnAbrasion or minor burn
Basal cells migrate across the woundBasal cells migrate across the wound
Contact inhibition w/ other cells stops migrationContact inhibition w/ other cells stops migration
Problems that resultProblems that result– shock due to water, plasma & plasma shock due to water, plasma & plasma
protein lossprotein loss– circulatory & kidney problems from circulatory & kidney problems from
loss of plasmaloss of plasma– bacterial infectionbacterial infection
Destruction of Destruction of proteins of the skinproteins of the skin– chemicals, chemicals,
electricity, heatelectricity, heat
1717
Skin GraftsSkin GraftsNew skin can not regenerate if New skin can not regenerate if stratum basale and its stem cells stratum basale and its stem cells are destroyedare destroyed
Skin graft is covering of wound Skin graft is covering of wound with piece of healthy skinwith piece of healthy skin
To ensure no tissue rejection To ensure no tissue rejection occurs transplantations are:occurs transplantations are:
– Autografts (from self)Autografts (from self)
– Isografts (from twin)Isografts (from twin)
– Autologous skin usedAutologous skin used
transplantation of patients transplantation of patients skin grown in cultureskin grown in culture
Serial documentation of healing skin graftsfollowing burns in an 18 month old child.Photographer: Gigi William's
http://www.nlm.nih.gov/medlineplus/ency/article/002982.htm for more info.
1818
Pressure SoresPressure Sores
Decubitus ulcersDecubitus ulcers
Caused by constant deficiency Caused by constant deficiency of blood flow to tissueof blood flow to tissue
Areas affected is skin over Areas affected is skin over bony prominence in bedridden bony prominence in bedridden patientspatients
Preventable w/ proper carePreventable w/ proper care