skin and fascia description for medical students from clinical anatomy by richard s. snell .you get everything you want follow me back and tell anything which is in your heart :) <3
slides by our kind hearted teacher MAM AMMARAH :)
skin and fascia description for medical students from clinical anatomy by richard s. snell .you get everything you want follow me back and tell anything which is in your heart :) <3
slides by our kind hearted teacher MAM AMMARAH :)
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Palestine last event orientationfvgnh .pptxRaedMohamed3
An EFL lesson about the current events in Palestine. It is intended to be for intermediate students who wish to increase their listening skills through a short lesson in power point.
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How to Split Bills in the Odoo 17 POS ModuleCeline George
Bills have a main role in point of sale procedure. It will help to track sales, handling payments and giving receipts to customers. Bill splitting also has an important role in POS. For example, If some friends come together for dinner and if they want to divide the bill then it is possible by POS bill splitting. This slide will show how to split bills in odoo 17 POS.
The Roman Empire A Historical Colossus.pdfkaushalkr1407
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
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Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
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4. Integumentary System
• Consists of skin, hair, nails and various glands
• Two major components:
• Cutaneous membrane (skin)
• Epidermis - superficial
• Dermis – underlying connective tissue
• Accessory structures
• Hair, nails, exocrine glands
• Hypodermis (subcutaneous layer) – loose connective tissue
under the dermis
• Separates the integument from deeper tissues and
organs
• Often not considered part of the integumentary system
presentation is prepared by Saad khan
5. presentation is prepared by Saad khan
Figure 5-1 The General Structure of the Integumentary System.
Cutaneous Membrane
Epidermis
Papillary layer
Reticular layer
Dermis
Hypodermis
Accessory Structures
Hair shaft
Pore of sweat
gland duct
Touch receptor
Sebaceous gland
Arrector pili muscle
Sweat gland duct
Hair follicle
Pressure receptor
Nerve fibers
Sweat gland
Fat
Artery
Vein
Cutaneous
plexus
6. presentation is prepared by Saad khan
Five General Functions of the Integument
1. Protection
• Skin covers underlying tissues and prevents fluid loss
2. Temperature maintenance
• Skin regulates heat exchange with the environment
3. Synthesis and storage of nutrients
• Epidermis synthesizes vitamin D3
• Dermis stores lipids in adipose tissue
7. presentation is prepared by Saad khan
Five General Functions of the Integument
(Introduction)
4. Sensory reception
• Receptors for pain, pressure, touch, and temperature detect
stimuli and send information to nervous system
5. Excretion and secretion
• Glands excrete salts, water, and organic wastes
• Specialized mammary glands secrete milk
8. presentation is prepared by Saad khan
The Epidermis (5-1)
• Is stratified squamous epithelium
• Thick skin has five layers (palms, soles)
• Thin skin has four layers (rest of body)
• Layers are called strata, from deep to superficial
• Stratum basale
• Three intermediate layers
• Stratum spinosum, stratum granulosum, and stratum
lucidum
• Stratum corneum
9. presentation is prepared by Saad khan
Figure 5-2 The Structure of the Epidermis.
Surface
Stratum
corneum
Stratum
lucidum
Stratum
granulosum
Stratum
spinosum
Stratum basale
Basement
membrane
Dermis
Thick skin LM x 210
10. presentation is prepared by Saad khan
Stratum Basale (5-1)
• Also called stratum germinativum
• Attached to basement membrane by hemidesmosomes
• Forms epidermal ridges down into dermis
• Dermis has dermal papillae up into epidermis
• Epidermis is avascular
• Ridges and papillae increase surface area for diffusion
between dermis and epidermis
• Contains basal or germinative cells
11. Stratum Basale
• Contours of skin follow ridge patterns
• Ridge contours are genetically determined =>
unique to each person and don’t change
• Fingerprints – ridge patterns of the fingers
presentation is prepared by Saad khan
www.crime-
scene-
investigator.net
12. presentation is prepared by Saad khan
Intermediate Strata (5-1)
• Stratum spinosum is the result of stem cell
division
• Stratum granulosum cells make a lot of keratin
• A protein that provides water resistance and the foundation
for hair and nails
• In others, horns, hooves, feathers, baleen
• Stratum lucidum cells are densely packed into a
highly keratinized layer – only thick skin
13. presentation is prepared by Saad khan
Stratum Corneum (5-1)
• At exposed surface of the skin
• Contains 15–30 layers of keratinized or cornified
dead cells
• Cells are connected via desmosomes and are
therefore shed in large groups (sheets rather than
individuals)
• Takes 7-10 days to move from stratum basale to
stratum corneum
• After two weeks in stratum corneum, shed or
washed away
15. presentation is prepared by Saad khan
Skin Color (5-2)
• Role of pigmentation
• Carotene is orange-yellow, accumulates in epidermis, and
comes from orange-colored foods
• Can be converted to vitamin A
• required for normal maintenance of epithelial tissues
• Synthesis of photoreceptors in the eye
19. Skin Color
presentation is prepared by Saad khan
http://anthro.palomar.edu/adapt/images/ma
p_of_skin_color_distribution.gif
20. Albinism
• Light colored skin or hair
• Melanin is not produced in melanocytes even
though of normal abundance
presentation is prepared by Saad khan
22. presentation is prepared by Saad khan
Beneficial Effects of Sunlight on Skin (5-3)
• Vitamin D3 is derived from:
• A cholesterol-related steroid in the epidermis when exposed
to sunlight
• Vitamin D3 is modified by:
• The liver and the kidneys into calcitriol, essential for calcium
and phosphorus absorption in the small intestine
• Lack of vitamin can lead to weak and flexible bones
23. presentation is prepared by Saad khan
Detrimental Effects of Sunlight on Skin (5-3)
• Skin cancers
• Basal cell carcinoma is most common
• Originating in stratum basale
• Squamous cell carcinoma found in more superficial layers
• Both of these are treatable in most cases
• Surgical removal of tumor is most common treatment
24. presentation is prepared by Saad khan
Detrimental Effects of Sunlight on Skin (5-3)
• Skin cancers
• Malignant melanoma is most dangerous
• Usually begins from a mole, and can metastasize through
the lymphatic system
• Survival depends on when detected and when treatment
begins.
• Avoiding UV radiation by using sunblock can help prevent all
three types
28. presentation is prepared by Saad khan
The Dermal Reticular Layer (5-4)
• Interwoven meshwork of dense, irregular
connective tissue
• As well as mixed in cells of connective tissue proper
• Elastic and collagen fibers are present
• Combine to establish the right balance of flexibility and
stability
• Collagen fibers extend from up into the dermal
papillae
• Down into the hypodermis
29. presentation is prepared by Saad khan
The Dermal Reticular Layer (5-4)
• Hair follicles and sweat glands derived from
epidermis
• Extend down into the dermis
• Cutaneous plexus—blood vessels from the
hypodermis—extends up into the reticular layer
• Provides oxygen/nutrients and removes carbon
dioxide/waste
• Blood vessels, lymphatics, and nerves
• Supply nutrients, eliminate wastes, control secretions, and
respond to stimuli
30. presentation is prepared by Saad khan
Figure 5-1 The General Structure of the Integumentary System.
Cutaneous Membrane
Epidermis
Papillary layer
Reticular layer
Dermis
Hypodermis
Accessory Structures
Hair shaft
Pore of sweat
gland duct
Touch receptor
Sebaceous gland
Arrector pili muscle
Sweat gland duct
Hair follicle
Pressure receptor
Nerve fibers
Sweat gland
Fat
Artery
Vein
Cutaneous
plexus
31. presentation is prepared by Saad khan
The Hypodermis (5-5)
• Also called the subcutaneous layer
• Deep to the dermis without a clear line separating them
• Not actually part of the integument
• But stabilizes the skin to underlying tissues
• Made of areolar tissue with many adipose cells
• Baby fat – cushions and reduces heat loss
32. presentation is prepared by Saad khan
The Hypodermis (5-5)
• Fat layers changes as we age
• Men – neck, upper arms, lower back
• Women – buttocks, breasts, hips, thighs
• Both - abdomen
• No vital organs in area make it an ideal site for
subcutaneous injections
35. presentation is prepared by Saad khan
Hair and Hair Follicles (5-6)
• Are accessory organs of the integumentary
system
• Hairs are nonliving structures produced in hair
follicles
• Project above the skin surface everywhere except:
• The soles of the feet, palms of the hands, sides of the
fingers and toes, the lips, and portions of the external
genitalia
36. presentation is prepared by Saad khan
Hair and Hair Follicles (5-6)
• Epidermal layers invaginate into the dermis to
form hair follicles
• Epithelium at the base of follicle caps over the hair
papilla
• Connective tissue that contains capillaries and nerves
• Epithelial stem cells divide to form hair matrix
surrounding the papilla
38. presentation is prepared by Saad khan
Hair and Hair Follicles (5-6)
• Hair grows according to a hair growth cycle
• Will grow for 2-5 years
• Follicle may become inactive for another 2-5 years
• When another cycle begins, the follicle starts producing
and new hair and the old hair is shed
• Variations in length come from this
• Size of follicles and shape of hair determine
straight (round c.s.) and curly (flattened c.s.)
39. presentation is prepared by Saad khan
Figure 5-5a Hair Follicles and Hairs.
Sebaceous gland
Hair shaft
Hair
Hypodermis
Connective tissue sheath
of hair
Cortex
Medulla
Hair matrix
Hair papilla
In this section of skin of the
scalp, notice that the two hair
follicles extend into the hypo-
dermis.
40. presentation is prepared by Saad khan
Figure 5-5b Hair Follicles and Hairs.
This drawing shows a
longitudinal section of a
single hair follicle and hair.
Hair papilla
Hair matrix
Connective
tissue sheath
Hair root
Arrector
pili muscle
Sebaceous
gland
Hair shaft
Boundary
between
hair shaft
and
hair root
41. presentation is prepared by Saad khan
Figure 5-5c Hair Follicles and Hairs.
Connective tissue
sheath
Wall of hair follicle
Cuticle of hair
Cortex of hair
Medulla of hair
This cross section through a
hair follicle was taken at the
boundary between the hair
shaft and hair root.
42. presentation is prepared by Saad khan
Functions of Hair (5-6)
• Protects the scalp – uv light, help cushion from
light blow, insulates
• Prevents entry of foreign particles into nose, eyes,
and ears
• Prevents injury via sensory perception – ie swat
mosquito
• Expresses emotional state by hair standing up,
due to contraction of arrector pili muscle
44. presentation is prepared by Saad khan
Hair Color (5-6)
• Differences due to type and amount of melanin
from melanocytes
• Genetically determined
• Aging results in less pigment production
• Causing gray or white hair
• Due to lack of pigment and bubbles in air shaft
52. presentation is prepared by Saad khan
Modified Sweat Glands (5-7)
• Mammary glands
• Secrete milk
• Ceruminous glands
• Secrete a waxy substance that combines with
sebaceous oils to form earwax
53. presentation is prepared by Saad khan
Nails (5-8)
• Protect tips of fingers and toes
• Visible nail body
• Made of dense, keratinized cells recessed under surrounding
epithelium
• Nail bed
• Deeper level of epithelium covered by nail body
54. presentation is prepared by Saad khan
Nails (5-8)
• Nail root
• Where the nail is produced
• Covered by the cuticle
• Lunula
• Pale crescent near root
55. presentation is prepared by Saad khan
Figure 5-8 The Structure of a Nail.
Free edge
Nail body
Nailbed
Lunula
Cuticle
(eponychium)
Nail root
(site of growth)
Epidermis Dermis Bone of fingertip
57. presentation is prepared by Saad khan
Repair of the Integument (5-9)
• Skin regeneration occurs because:
• Stem cells of epithelium and connective tissue undergo cell
division
• Replacing lost or damaged tissue
• Time depends on extent of damage
• Four steps of skin repair
1. Scab formation
2. Tissue granulation
3. Scab removal
4. Scar formation
58. presentation is prepared by Saad khan
Repair of the Integument (5-9)
• Scab formation
• A blood clot that forms on the surface
• Is a temporary "patch" and can help prevent additional
microbes from invading the injury
• Granulation tissue
• Is formed from the combination of the fibrin blood clot,
fibroblasts, and capillaries
• Macrophages clean up debris
59. presentation is prepared by Saad khan
Repair of the Integument (5-9)
• Clot removal and a decline of capillaries
• Scar is formed from remaining meshwork of collagen fibers
• Degree of scar dependent on severity and location of injury
and age of patient
• Keloid scars are thicker, raised, smooth, and shiny
epidermal surface
60. presentation is prepared by Saad khan
Figure 5-9 Events in Skin Repair.
Epidermis
Dermis
Mast cells
Migrating
epithelial
cells
Macrophages
and fibroblasts
Granulation
tissue
Fibroblasts
Scar
tissue