Anal Canal - Simplified Anatomy

After watching this video you will be able to:
Define and describe the internal features of the anal canal: pectinate line, anal columns, valves and sinuses.
Describe the anal sphincters (internal and external) and provide a comparison between them in relation to the type of muscle fibers, extent, innervation and relation to puborectalis.
Describe the venous drainage of the anal canal and demonstrate the presence of a portocaval anastomosis.
Identify the position of the anal cushions.
Discuss the significance of internal rectal venous plexus and arteriovenous anastomosis.
Compare the upper and lower part of the anal canal in relation to embryological origin, lining epithelium, arterial blood supply, venous drainage, lymphatic drainage, nerve supply and internal features.
Discuss the applied anatomy of internal and external hemorrhoids in relation to their location, formation, predisposing factors, pain sensation, and susceptibility to bleeding.
Identify the location of the anal fissure and provide the anatomical explanation for the associated pain and spasm.

0:00 Extent of the anal canal
0:22 Internal features of the anal anal
1:49 Embryology
2:58 Histology
3:16 Sphincters
4:50 Arterial blood supply
5:58 lymphatics and tumor metastasis
6:47 Nerve supply and the pain of an anal fissure
8:07 Venous drainage, portal caval anastomosis and hemorrhoids

Presented and edited by Dr. Akram Jaffar, Ph.D. February 2013

Related accounts

[dimabelane]

thanku dr. the sound was like listening in radio during world war 2 :). really helpful lecture thanku

[hadizajibril]

Someone please give Dr. Akram a medal. Thank you so much sir!

[SaraMcGrey]

You simplified in a way that made me understand it 100 times more than what I've just read in the book!! Thank you, sir. You indeed are a great doctor.

[sarahmutairi]

thank you doctor you have helped me a lot since i was in my first year of medical college now I'm in 4th year and if i want a quick review of anatomy the first thing I do I see your videos so thank Allah for finding you in my study life.

[vrachosamah]

والله شرح اكثر من رائع شكرًا دكتور وافتخر بيك كونك عراقي :)

[mashaelalzanbagi]

Dr. Akram, you're one of the best anatomy instructors out there. I truly appreciate all the effort you put into making these videos. Your videos have helped me in understanding Anatomy and throughout medicine school.

[shubhamkhunger]

Simply Amazing. Saved me at least an hour of textbook study. Thanks a Lot!!

[binishasebby]

Was tired of thinking to study this topic from textbook... simply searched.... and i found out this.... amazing... no words to thank you so much sir... 😍😍😍

[SanaYousif]

This is awesome! Thank you doctor. Your informative explanation is making me understand the basics of surgery.

[MrAvatarcito]

EXCELLENT ! The basic point, as I see it, is understanding that there are 2 different embriological origins of the structures in this region. The rest comes then almost logically. Thank you very much for your video! It has made the anatomy of this region easier to understand, for me.

[shivanisharma]

Best explanation in whole YouTube. To the point and precise.thank you for your amazing work

[tarynhallam]

Amazing explanation of a topic that is often very poorly taught. Thank you so much. You have an excellent ability to simplify a complex topic.

[MultiSamsoma]

I teach anatomy, I always use your videos as a revision tool. thanks for your excellent effort

[girijasharma]

Salute to you Sir, i am a teacher and use your videos to help my surgical residents.
lord bless for your contribution

[Lajjalu]

This is simply amazing. Brief yet Complete and points out the important stuff. From anatomy to blood supply, innervation, lymphatics and even discussed some about hemorrhoids. You're awesome! It helped me a lot. Thanks!

[saranshmittal]

Well gotta say you are outstanding dr Akram.. Your tutorials are best..

[ahmedrocks]

You are a very good instructor and illustrator, dr. Thank you very much

[milkshake]

If I being anatomy instructor in one day its gonna be because of you and I'll take ur tutorials as reference for my lectures, , from the deepest point of my heart I appreciated the minutes you spent to made such a gorgeous, outstanding tutorial and guess what ts freee

[PINK]

Thank you very much ! I can't thank you enough. you made it much easier for me.
I'm a 4th year medical student and I'm having my surgery rotation these two months.
Thank you alot 

[olanajah]

شكرا دكتور على قناتتك الرائعه نفتخر بيك انت قدوتنا
منوره الاكسنت العراقيه كلش حلوه وان شائ الله المزيد من التقدم والموفقيه :)