Development of the Great Vessels Flashcards Preview

Anatomy > Development of the Great Vessels > Flashcards

Flashcards in Development of the Great Vessels Deck (55):

what fetal veins form the commom cardinal v. ?

anterior cardinal v.
posterior cardinal v.


what fetal veins form/drain to the sinus venosus ?

-common cardinal v.
-umbilical v.
-vitelline v.


on what surface of the primordial atrium do the right and left horns of the sinus venosus enter ?

dorsal and inferior


what does the fetal vitelline v. carry

returns poorly oxygenated blood from the yolk sac (umbilical vesicle) to the primordial heart


what does the fetal umbilical v. carry

well-oxygenated blood from mother via chorionic sac to the embryo


what does the fetal common cardinal v carry

returns poorly oxygenated blood from the body of the embryo back to primordial heart


how does the left brachiocephalic v. form in adults

in 8th week R and L anterior cardinal vv. anastomize
-caudal part of the L ant. cardinal v degenerates and whats remaining is the left brachiocephalic v.


how is the superior vena cava formed (SVC)

right anterior cardinal v. + right common cardinal v.
**makes sense cuz all venous return by SVC is on R side of heart in adult****


the root of the Azygos is formed by ______ and drains to ______ ?

posterior cardinal v.
SVC on right side


how is the common iliac vv. formed

posterior cardinal v


what do the Left and Right umbilical veins become in the adult

-Right umbilical v degenerates
- Left umbilical v. forms the ductus venosus


in the fetal circulation what is the function of the ductus venosus

connects the umbilical v. to IVC and prevents liver overload


what forms the hepatic portal system ?

Left and Right Vitelline vv. CAUDAL to the liver
**makes sense cuz portal v. carries blood from GI tract back to heart***


The inferior vena cava (IVC) is composed of ______ segments that formed from ______ number of fetal vv. ?

4 segments formed from 4 vv.
(dont need to know specifics)


The vast majority of the azygos v. develops from ?

subcardinal v.


the hemizygous v. develops from ?

subcardinal v.


what is the only part of the azygous v. that does not developr from the subcardinal v ?

Root of the azygous
-formed from the posterior cardinal v.


what do the R and L sinus venosus horns become in the adult ?

-R sinus venosus horn becomes sinus venarum (smooth area) in post. wall of R atrium
-L sinus venosus horn becomes coronary sinus


the adult umbilical v. arises from what fetal v. ?

Left umbilical v.


the right brachiocephalic v. in adults comes from ?

Right anterior cardinal v.


what is the function of pulmonary veins in adults

bring oxygenated blood to the heart from the lungs


how do the pulmonary veins form in adults

as outgrowths from the posterior wall of the L atrium


truncal ridges arise from what fetal structure, and are derived from what type of cells

arise from truncus arteriosus
-derived from neural crest mesenchyme


where do bulbar ridges arise from , what is their cellular derivative

arise from bulbus cordis
-derived from neural crest mesenchyme


the further development of the truncal and bulbar ridges become ?

aorticopulmonary septum


what is the function of the aorticopulmonary septum

seperate the ascending aorta from the pulmonary trunk


how do the ventricles play a role in where the aorta and pulmonary trunk are positioned

after fusion of aorticopulmonary septum, streaming of blood from ventricles causes a 180 turn
-results in aorta being posterior and pulmonary trunk ant.


what can occur of the aorticopulmonary septum does not rotate fully ?

transposistion of great vessels
-cyanotic heart disesase (turn blue from lack of O2)


What is tetraology of Fallot ?

unequal division of the truncus arteriosus


where is the truncus arteriosus in reference to the bulbus cordis



what are the 4 signs/symptoms of tetralogy of Fallot

1 - pulmonary a. stenosis
2 - ventricular septal defect
3 - dextroposition of the aorta
4 - right ventricular hypertrophy


Adult coronary aa. are formed in 2 steps, what are they ?

1 - sprouts off sinus venosus and epicardium
2 - endothelial cells invade/ingrowth into the aorta


how many pharyngeal arches are there ? which of them has no adult derivative

6 total
-pharyngeal arch 5 degenerates in adults


what does the 1st pharyngeal arch a. become

-maxillary a.
-external carotid a (ECA)


what does the 2nd pharyngeal arch a. become in adults

stapedial a.


what does the 3rd pharyngeal arch a. become

-common carotid a. (CCA)
-proximal internal carotid a. (ICA)


what does the Left 4th pharyngeal arch a. become ?

part/arch of aorta thats b/w CCA and L subclavian


what does the right 4th pharyngeal arch a. become ?

proximal Right Subclavian


what forms the adult left subclavian a. ?

Left 7th intersegmental a.


what forms the distal part of the right subclavian a.

R dorsal aorta + R 7th intersegmental a.


the complete arch of the aorta is formed by 4 structures, what are they ?

1 - truncus arteriosus
2 - aortic sac
3 - 4th pharyngeal arch a.
4 - left dorsal aorta


what does the L 6th pharyngeal arch a become ?

Proximal L 6th = proximal L pulmonary a.
Distal L 6th = ductus arteriosus


what is the function of ductus arteriosus

connect L pulmonary a. to aorta to shunt blood away from lung in embryo (cuz get O2 from mother)


what does the R 6th pharyngeal arch a. become

Proximal R 6th = proximal right pulmonary a.
distal R 6th = jack shit (degenerates)


what is the difference b/w the R and L recurrent laryngeal nn. ? what causes this ?

L recurrent laryngeal loops much lower
-this is b/c on R side the distal of 6th pharyngeal arch a. degenerates whereas distal of L 6th pharyngeal arch a. becomes the ductus arteriosus


what forms the common iliac aa. in the adult

5th pair of intersegmental aa.


what forms the lateral sacral a. in adults

intersegmental aa. from the sacral region


fetal intersegmental aa. in the thoracic region become what in adults

intercostal aa.


what does the fetal vitelline aa persist as in the adults

1 - celiac trunk
2 - Superior mesenteric artery (SMA)
3 - Inferior mesenteric artery (IMA)


what does the proximal fetal umbilical a. become in adults

- internal iliac a.
-superior vesical a.


what is the function of foramen ovale in fetal circulation

connects R and L atrium to NOT allow blood flow into pulmoary circuit (dont need O2 from lungs yet)


the venous angle is b/w what 2 veins

IJV and subclavian vv


what is cisterna chyli

dilation of lymph that drains the intestinal and lumbar region


what forms the adult thoracic duct ?

caudal part R lymphatic duct + anastomosis of R and L cranial thoracic ducts


what forms the adult right lymphatic duct

cranial portion of R lymphatic duct