:subclavian artery 5th Aortic arches: regress 6th Aortic arches: l

(1)

(2)

(3)

(4)

(5)

(6)

Ritorno venoso del sistema coronario:

SENO CORONARIO (v. cardiaca anteriore,

v. cardiaca piccola, v. cardiaca media e posteriore del v.s.

Ed obliqua dell’atrio destro)

VENE CARDIACHE ANTERIORI VENE CARDIACHE MINIME

(7)

(8)

(9)

(10)

(11)

(12)

(13)

(14)

(15)

(16)

(17)

(18)

(19)

(20)

(21)

(22)

(23)

(24)

(25)

(26)

(27)

(28)

(29)

(30)

(31)

(32)

(33)

(34)

(35)

(36)

(37)

(38)

1st Aortic arches: maxillary arteries 2nd Aortci arches: stapediae arteries 3rd Aortic arches: carotids

4° Aortic arches: l. aortic arch

r. :subclavian artery 5th Aortic arches: regress

6th Aortic arches: l. Left pulm. Artery, ductus arteriosus.

r. right pulm. Artery

(39)

Sistema venoso embrionale

Vene ombelicali Vene vitelline Vene cardinali

(40)

(41)

Vene ombelicali ( placenta, connessione con il fegato o.s.) Vene vitelline

(sacco vitellino: vena porta e tratto post- epatico della cava inferiore)

(42)

Vene cardinali (corpo embrionale: anteriori e posteriori)

(43)

•The cardinal system initially consists of symmetric, paired anterior and posterior cardinal veins draining into the sinus horns via short common cardinal veins; the anterior cardinals draining the head and neck and the posterior cardinals draining the body wall.

•The posterior cardinals mostly degenerate after being superseded by 2 pairs of longitudinal veins:

System superseding posterior

cardinal veins Function

Subcardinal system Drains medial dorsal body wall, especially kidneys and gonads Supracardinal system Drains thoracic body wall

•The right subcardinal vein forms the next most caudal part of the IVC after the right vitelline vein, into which the left cardinal vein will then drain

•The supracardinal system, has 2 portions:

Supracardinal system portion Function

Abdominal Left abdominal supracardinal degenerates; right abdominal supracardinal forms the IVC between the

renal and iliac veins

Thoracic left and right supracardinals form the hemiazygos and azygos veins, respectively

(44)

•The anterior cardinal system drains the head, neck and upper limbs, and forms the SVC.

Anterior cardinal vein portions Function

Distal Form internal jugular veins

Proximal Right anterior cardinal becomes SVC; Left anterior cardinal degenerates, so left brachiocephalic vein

forms to drain left anterior cardinal system into SVC

The coronary circulation

•The coronary arteries develop from blood islands deep to the epicardium, receiving their blood from coronary arteries that sprout from the ascending aorta, and draining via coronary veins into the

coronary sinus.

(45)

•The inferior vena cava (IVC), The superior vena cava (SVC):

•from cranial to caudal, is composed of: 1. proximal anterior cardinal right 1.The right vitelline vein vein

2.The right subcardinal vein Coronary sinus:

3.The posterior cardinal veins 1.left anterior cardinal vein and left side of sinus venosus

(46)

(47)

Tronchi arteriosi

(48)

(49)

(50)

(51)

(52)

(53)

(54)

(55)

(56)

(57)

(58)

(59)

(60)

(61)

(62)

(63)

(64)

(65)

Modificazioni circolatorie alla nascita