**Skin Structure:** - Made up of epidermis (outer layer) and dermis (inner layer). - Epidermis is avascular and made of keratinized stratified squamous epithelium. - Dermis is vascularized connective tissue. - Below dermis is subcutaneous layer (hypodermis) made of adipose tissue. **Epidermis Layers:** 1. Stratum basale: Single row of rapidly dividing keratinocytes, contains melanocytes and tactile cells. 2. Stratum spinosum: Several layers of spiky cells connected by desmosomes, contains dendritic cells. 3. Stratum granulosum: 4-6 cell layers, beginning of keratinization. 4. Stratum lucidum: 2-3 cell layers of clear, dead keratinocytes. 5. Stratum corneum: 20-30 cell layers of dead, anucleated keratinocytes. **Dermis:** - Strong, flexible connective tissue. - Papillary layer: Thin, areolar connective tissue with dermal papillae. - Reticular layer: Dense fibrous connective tissue with blood vessels. **Skin Pigmentation:** - Melanocytes produce melanin, determining skin color and protecting from UV radiation. - Other pigments include carotene (yellow-orange) and hemoglobin (red when oxygenated). **Skin Appendages:** 1. Hair: Made of dead, keratinized cells, produced by hair follicles. 2. Nails: Modified epidermis made of hard keratin. 3. Glands: Sweat glands (eccrine and apocrine), sebaceous glands (oil glands).
1) Collagen and elastic fibers are seen in the papillary layer of dermis. 2) Reticular tissue is made of irregular dense connective tissue. 3) Melanocytes are seen in the stratum basale of epidermis. 4) Eccrine/Merocrine sweat glands release their watery secretion directly to the epidermis. 5) Apocrine sweat glands release their secretion through the hair follicles on certain areas(armpits and outer genital areas) and cause body odor.
I need to go through your profile and biography. You inspire me a lot. I'm even confused on your area of interest. You're always the best in everything.
the rest of lecture is awesome just this one part is confusing at 9:47 when you say this last section has an internal and external part ... can you plz elaborate a little bit more ?
The video says in 2:50 that the stratum basale has tactile cells for sensation, but I thought that all tactile cells (along with blood vessels) were located in the dermis and ended there.
Hi Professor Dave, I'm studying laser tattoo removal which has an anatomy & physiology course within it. I'm struggling to understand where the hair bulb (that connects to the dermal papilla) actually lies - is it in the papillary layer or the reticular layer? thanks
Can someone please tell me what is the difference between integumentary system and exoskeleton. Hair, feather, scales and horns are examples of exoskeleton or integumentary system.
the rest of lecture is awesome just this one part is confusing at @ when you say this last section has an internal and external part ... can you plz elaborate a little bit more ?
**Skin Structure:**
- Made up of epidermis (outer layer) and dermis (inner layer).
- Epidermis is avascular and made of keratinized stratified squamous epithelium.
- Dermis is vascularized connective tissue.
- Below dermis is subcutaneous layer (hypodermis) made of adipose tissue.
**Epidermis Layers:**
1. Stratum basale: Single row of rapidly dividing keratinocytes, contains melanocytes and tactile cells.
2. Stratum spinosum: Several layers of spiky cells connected by desmosomes, contains dendritic cells.
3. Stratum granulosum: 4-6 cell layers, beginning of keratinization.
4. Stratum lucidum: 2-3 cell layers of clear, dead keratinocytes.
5. Stratum corneum: 20-30 cell layers of dead, anucleated keratinocytes.
**Dermis:**
- Strong, flexible connective tissue.
- Papillary layer: Thin, areolar connective tissue with dermal papillae.
- Reticular layer: Dense fibrous connective tissue with blood vessels.
**Skin Pigmentation:**
- Melanocytes produce melanin, determining skin color and protecting from UV radiation.
- Other pigments include carotene (yellow-orange) and hemoglobin (red when oxygenated).
**Skin Appendages:**
1. Hair: Made of dead, keratinized cells, produced by hair follicles.
2. Nails: Modified epidermis made of hard keratin.
3. Glands: Sweat glands (eccrine and apocrine), sebaceous glands (oil glands).
thank you for the simplication sir
Ily
Much appreciated.
1) Collagen and elastic fibers are seen in the papillary layer of dermis.
2) Reticular tissue is made of irregular dense connective tissue.
3) Melanocytes are seen in the stratum basale of epidermis.
4) Eccrine/Merocrine sweat glands release their watery secretion directly to the epidermis.
5) Apocrine sweat glands release their secretion through the hair follicles on certain areas(armpits and outer genital areas) and cause body odor.
Thank you
One day, I'm going to be at this level of excellence. Thank you Professor Dave, you inspire me to be great.
Same!
@@JGscienceGaming
Same _and_ same.
This is the best explanation out of all the other youtube videos. Thank you so much, I really appreciate it!!!!!!
Bros 14 minutes teachings make more sense than my lecturers of 4hrs 😂😂🙌
found this with 2 days to go before an exam! Amazing, my profs lectures make no sense but this visual image of it is amazing!
taught me more than my own professor who ive paid to teach me....
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You speak the truth this guy is a God send.
I also paid for the course but learning from TH-cam 🤣
I agree!! My teacher mostly reads from a book!!
Pretty much the same for me …
I need to go through your profile and biography. You inspire me a lot. I'm even confused on your area of interest. You're always the best in everything.
This video will come in clutch for my anatomy and physiology exam :D
Thank's a lot sir GOD bless you
Thank you for your videos. They're great and gives me an overview ahead the topic, organized, and simple
Always get topnotch lecturers from your teachings. Excellent!
hi, im from malaysia. im bad in english. but when i found your vid, i really undrstood it compared with the other video. tq so muchh!!!
So thankful for your channel. Now to watch this video over and over till my brain remembers it! 🤣
Thank you 🙏🏼 aesthetician student here 🙋🏻♀️
Thank you for sharing your knowledge about these things, Professor. I could say you're my best virtual science teacher. THANK YOU SO MUCH!
You explain my 100 plus pages in less than an hour
God bless you ❤️
Great animation and explanation! Love your series!
Your videos are the best!! You go straight to the point!
I'm just a nursing student trying to start the semeser off right !!!!!
Cosmetology Student, Thank you👩🎓💙
I have a bad infection. I've been to many dermatologist. They don't help me. I'm looking to fig it out myself. Thanks a bunch.
what an easy explanation woooooow I become a fan... Thank you so much
Your explanation is clear and helpful to me as am pursuing my degree
The video is very helpful in my teaching. Can I have a copy of the offline video? Thank you very much.
thumb up for the good works Professor Dave
Really helpful professor Dave . Please keep doing this
Thank you so much you really saved me today God bless you
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Thank you so much professor dave 💜💜💜🫶🏻
Congrats on advance fr 1 M subscribers love from Pakistan
My most inspired Professor ❤❤
So helpful
Teaches better than my professor
We'll be having a reporting tomorrow and this surely helps a lot .thanks!
Thank you sir for making excellent video on this chapter.....
Bangin' playlist, stud!
Extraordinary! thank you for your generosity of sharing so much knowledge!
Got a 100 on my epi dermis quiz thank you!!!!
You really make everything seem too simple. thank you very much
Thank you very much, there are a lot of new information I got from your kind lecture.
Very excellent explanation about skin. Marvelous.
4:19 what layer
Had to double check and yeah,it’s what you heard
Thank you biology jesus, you have taught me well.
Great teacher in youtube......
This video definitely helped me with my studying. Thanks.
One word, "Brilliant"!
This showed up on my TH-cam homepage as I’m learning about the integumentary system in my Anatomy & Physiology class….😳
Thank you professor Dave 😊
Thank you, Prof! 💖💖
oh prof, you are actually awesome.
WELL EXPLAINED. THANKS
Your explanations are perfect! Thank You
thank you professor dave
Very great detailed video
Thank u sir ...for this good explanation and notes👍
Excelente explicación ...muchas gracias
Thanks for the video it's really helpfull
thank you for simplifying science
Thank you so much for the video!!
the rest of lecture is awesome just this one part is confusing at 9:47 when you say this last section has an internal and external part ... can you plz elaborate a little bit more ?
Thanks Professor Dave!!
Thankssss, this was really helpful!
Hi! Why the other video are private? I always follow your lesson. you are the best and very helpful :D :(
i release one per week, don't worry you'll get them all!
Thank you professor Dave
Best video 👍👍👍. Thank you so much 😍
The video says in 2:50 that the stratum basale has tactile cells for sensation, but I thought that all tactile cells (along with blood vessels) were located in the dermis and ended there.
maybe there at different points in the skin to be able to distinguish between hard and soft touch?
Wow this video is amazing ♥️♥️♥️
Nice presentation sir 👍💜
Thank you professor!! You made it really easy to understand
Thank you so much for making this awesome video!
GREAT VIDEO!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
VERY GOOD VIDEO BRO 👏👏👏👏👍👍
I didn’t know this even existed! Thank you!
thank you so much, this was very helpful!
Hi Professor Dave, I'm studying laser tattoo removal which has an anatomy & physiology course within it. I'm struggling to understand where the hair bulb (that connects to the dermal papilla) actually lies - is it in the papillary layer or the reticular layer? thanks
Stratum lucidum is only found in thick skin, such as palms of hands and soles of feet.
Hey everybody 👑JESUS👑 loves you ✝️❤️🙌
You are not alone in this world❤️
Good luck on your studying and test 😃
HE surely does! Thank you: ) And you.
Romans 3:23
And this video is very well done!
Thanks ❤❤❤ I appreciate it🎉🎉🎉
Thank you for this!
Thanks Dave!
Where is the video where you go more in depth about melanin and the other pigment cells? I can't find it in the series.
ah haven't done that yet
Well Explained. Thanks
You are heaven sent.
Great video💪
"Thanks for watching guys" No professor... thank YOU
You are amazing ❣️
Sir, you are genius
Can someone please tell me what is the difference between integumentary system and exoskeleton.
Hair, feather, scales and horns are examples of exoskeleton or integumentary system.
The papillary system is a very important system
Informative video👍
Thank you very much
I like this video it shows a lot of what i want in the skin
thank u so much sir ,God bless u
You are a genius
the rest of lecture is awesome just this one part is confusing at @ when you say this last section has an internal and external part ... can you plz elaborate a little bit more ?
Wonderful sir
thanks a lot bro
thanks man ur a goat. im probaly still gonna fail but this shit fyee glooks
BIG THANK YOU
very very Good Sir..........
i watched this now i got a perfect score in my exam