The pudendal canal is formed by the obturator internus fascia.
It encloses the following:
These vessels and nerve cross the pelvic surface of the obturator internus.
OPENING IN THE DIAPHRAGM
A commonly used mnemonic to remember the level of the diaphragmatic apertures is this: Mnemonic
- Aortic hiatus = 12 letters = T12
- Oesophagus = 10 letters = T10
- Vena cava = 8 letters = T8
opening | level | structures |
caval opening | T8 | inferior vena cava, and some branches of the right phrenic nerve |
esophageal hiatus | T10 | esophagus, the anterior and posterior vagal trunks, and some small esophageal arteries |
aortic hiatus | T12 | the aorta, the azygos vein, and the thoracic duct |
Impressions
On the mediastinal surface, immediately above the hilum, is an arched furrow which accommodates the azygos vein; while running upward, and then arching lateralward some little distance below the apex, is a wide groove for the superior vena cava and right innominate vein; behind this, and nearer the apex, is a furrow for the innominate artery.
Behind the hilum and the attachment of the pulmonary ligament is a vertical groove for the esophagus; this groove becomes less distinct below, owing to the inclination of the lower part of the esophagus to the left of the middle line.
In front and to the right of the lower part of the esophageal groove is a deep concavity for the extrapericardiac portion of the thoracic part of the inferior vena cava.
Course
The radial artery arises from the bifurcation of the brachial artery in the cubital fossa. It runs distally on the anterior part of the forearm. There, it serves as a landmark for the division between the anterior and posterior compartments of the forearm, with the posterior compartment beginning just lateral to the artery. The artery winds laterally around the wrist, passing through the anatomical snuff box and between the heads of the first dorsal interosseous muscle. It passes anteriorly between the heads of the adductor pollicis, and becomes the deep palmar arch, which joins with the deep branch of the ulnar artery.
Along its course, it is accompanied by a similarly named vein, the radial vein.
Origin | short head: coracoid process of the scapula. long head:supraglenoid tubercle |
The hypoblast is a tissue type that forms from the inner cell mass.[1] It lies beneath the epiblast and consists of small cuboidal cells.[2]
Extraembryonic endoderm (including Yolk sac) is derived from hypoblast.
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