**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.
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
**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
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.
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!
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 😂😂🙌
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.
taught me more than my own professor who ive paid to teach me....
😂😂😂😂😂😂
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 …
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
You explain my 100 plus pages in less than an hour
God bless you ❤️
Always get topnotch lecturers from your teachings. Excellent!
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.
I'm just a nursing student trying to start the semeser off right !!!!!
Thank you for sharing your knowledge about these things, Professor. I could say you're my best virtual science teacher. THANK YOU SO MUCH!
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.
Thank you 🙏🏼 aesthetician student here 🙋🏻♀️
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!!!
Thank you so much professor dave 💜💜💜🫶🏻
Thank you so much you really saved me today God bless you
My most inspired Professor ❤❤
So thankful for your channel. Now to watch this video over and over till my brain remembers it! 🤣
Thank you sir for making excellent video on this chapter.....
Excelente explicación ...muchas gracias
Your videos are the best!! You go straight to the point!
Extraordinary! thank you for your generosity of sharing so much knowledge!
Cosmetology Student, Thank you👩🎓💙
So helpful
Teaches better than my professor
thumb up for the good works Professor Dave
what an easy explanation woooooow I become a fan... Thank you so much
Great animation and explanation! Love your series!
You really make everything seem too simple. thank you very much
Got a 100 on my epi dermis quiz thank you!!!!
Very excellent explanation about skin. Marvelous.
We'll be having a reporting tomorrow and this surely helps a lot .thanks!
Thank you very much, there are a lot of new information I got from your kind lecture.
WELL EXPLAINED. THANKS
Really helpful professor Dave . Please keep doing this
thats was an amazing channel i ever watch
thank you professor dave
Stratum lucidum is only found in thick skin, such as palms of hands and soles of feet.
Thank you biology jesus, you have taught me well.
thank you for simplifying science
Great teacher in youtube......
This video definitely helped me with my studying. Thanks.
Very great detailed video
Your explanations are perfect! Thank You
Congrats on advance fr 1 M subscribers love from Pakistan
oh prof, you are actually awesome.
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 😊
Thanks for the video it's really helpfull
Thank you professor Dave
Bangin' playlist, stud!
Thank u sir ...for this good explanation and notes👍
One word, "Brilliant"!
thanks a lot bro
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
Thank you, Prof! 💖💖
GREAT VIDEO!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Thanks Professor Dave!!
This showed up on my TH-cam homepage as I’m learning about the integumentary system in my Anatomy & Physiology class….😳
The papillary system is a very important system
4:19 what layer
Had to double check and yeah,it’s what you heard
Thank you so much for the video!!
You are a genius
Nice presentation sir 👍💜
Thankssss, this was really helpful!
You are heaven sent.
hope you got my question waiting for ur reply sir
Thank you professor!! You made it really easy to understand
Thanks Dave!
Thank you very much
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 i use your video for my class?
I didn’t know this even existed! Thank you!
Best video 👍👍👍. Thank you so much 😍
Sir, you are genius
You missed to explain Hypodermis
Thank you for this!
Wonderful sir
BIG THANK YOU
thank you so much, this was very helpful!
Thank you
thank u so much sir ,God bless u
very very Good Sir..........
Well Explained. Thanks
Please also provide PDF of lecture which help much
Excellent thank you
Wow this video is amazing ♥️♥️♥️
Thank you so much for making this awesome video!
really helpful thanks
Goos bumbs is like a short heat rash
VERY GOOD VIDEO BRO 👏👏👏👏👍👍
Thanks bro
Thanks ❤❤❤ I appreciate it🎉🎉🎉
Excellent!!!
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Incredible!