Diaphragm: Anatomy and Embryology and Openings - USMLE Forums
USMLE Forums Logo
USMLE Forums         Your Reliable USMLE Online Community     Members     Posts
USMLE Articles
Go Back   USMLE Forums > USMLE Step 1 Forum > USMLE Step 1 High Yield > USMLE Step 1 Bits & Pieces

USMLE Step 1 Bits & Pieces High yield short focused points, monographs, charts, illustrations, tables, and other stuff related to the USMLE Step 1 Exam.

Thread Tools Search this Thread Display Modes
Old 11-01-2009
Ex-USMLE Forums Staff
Steps History: 1+CK+CS+3
Posts: 753
Threads: 106
Thanked 2,196 Times in 465 Posts
Reputation: 2244
Anatomy Diaphragm: Anatomy and Embryology and Openings

There's no better than this original Gray's Anatomy illustration to study the diaphragm anatomy and embryology for the USMLE Step 1 exam.

Click on the thumbnail to enlarge it
Diaphragm: Anatomy and Embryology and Openings-ddd1.jpg
Image from Wikimedia public domain

T8 Level: Caval hiatus (Label 2) transmitting the inferior vena cava.

T9 Level: Foramen of Morgagni (Label 1) also called sternocostal hiatus two on each side of the xiphoid process. Transmitting the superior epigastric vessels.

T10 Level: Esophageal hiatus (Label 6) transmitting the esophagus and the vagus branches. Note how it's formed by the right cruse of the diaphragm.

T12 Level: Aortic haitus (Label 7) transmitting the aorta, the azygous vein, and the thoracic duct.

Label 3: this is an opening for the splanchnic nerves, there are several unnamed openings that are not asked in USMLE such as this one and others for the hemizygous vein and phrenic nerves.

Labels 4, 5: Note how the right crus is originating from L1-L2-L3 while the left crus is originating from L1-L2. To remember this, just remember that the right lung has three lobes and the left lung has two lobes

Medial Arcuate Ligament (Label 7) covering the psoas major and the Lateral Arcuate Ligament (Label 8) covering the quadratous lumorum.

The central tendinous portions are derived from the pleuroperitoneal folds and the septum transversum (both names looking like tendinous). While the crura are derived from the dorsal esophageal mesentry (that's why the right crus is wrapping (just like mesentry) the esophagus. The peripheral muscular portions of the diaphragm are derived from the body wall as it's obvious in the illustration above.
Reply With Quote Quick reply to this message
The above post was thanked by:
..sharma (05-09-2012), anoop_1198 (10-20-2010), aungawa (01-14-2013), dr.digant (08-11-2011), dr.muhamad (11-22-2011), dr.taifur43 (05-08-2012), drali (01-27-2011), drortho (11-28-2011), drsue (12-29-2010), ehtisham (09-15-2013), erickven (04-30-2016), im99 (04-06-2011), mayankkaushal (01-11-2014), muhammad haris (06-11-2015), Ngozi (10-20-2010), Pixie (11-03-2010), slime66 (08-16-2014), studyhard (11-09-2010), Taiwan_Guy (05-19-2011), tmsid (12-29-2010), wahaha007 (01-10-2010), wimzie (12-30-2010), Zehra. (05-28-2010)

Old 05-08-2012
USMLE Forums Newbie
Steps History: Not yet
Posts: 1
Threads: 0
Thanked 0 Times in 0 Posts
Reputation: 10

thank you very much......
Reply With Quote Quick reply to this message
Old 04-06-2015
USMLE Forums Newbie
Steps History: Step 1 Only
Posts: 2
Threads: 0
Thanked 0 Times in 0 Posts
Reputation: 10

I remember like this!!
VENA CAVA = 8 letters =T8
ARCH OF AORTA(of course it not AOA which is passing, but just to remember)= THORACIC DUCT=12 letters = T 12
Reply With Quote Quick reply to this message


Anatomy-, Embryology-, Figures-, Gastrointestinal-Tract-, Musculoskeletal-

Quick Reply

Register Now

In order to be able to post messages on the USMLE Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Medical School
Choose "---" if you don't want to tell. AMG for US & Canadian medical schools. IMG for all other medical schools.
USMLE Steps History
What steps finished! Example: 1+CK+CS+3 = Passed Step 1, Step 2 CK, Step 2 CS, and Step 3.

Choose "---" if you don't want to tell.

Favorite USMLE Books
What USMLE books you really think are useful. Leave blank if you don't want to tell.
Where you live. Leave blank if you don't want to tell.


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Similar Threads
Thread Thread Starter Forum Replies Last Post
Best Embryology Book for USMLE Step 1 StepTaker USMLE Step 1 Recommended Threads 13 04-11-2017 04:58 AM
Embryology Crammer PDF Sujay88 USMLE Step 1 Forum 7 06-08-2016 10:27 AM
A bump while putting the diaphragm IrvineMom USMLE Step 2 CK Forum 1 06-30-2010 02:50 PM
Gut Embryology / Anatomy Yallah USMLE Step 1 Forum 4 03-24-2010 01:00 PM
High yield embryology baigalaa USMLE Step 1 Forum 2 10-23-2009 04:52 AM

RSS Feed
Find Us on Facebook
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.

USMLE® & other trade marks belong to their respective owners, read full disclaimer
USMLE Forums created under Creative Commons 3.0 License. (2009-2014)