embryo- great vessels Flashcards
during week 4, what Pairs of veins drain into the Sinus Venosus?
1) Anterior cardinal vein
2) posterior cardinal vein
3) umbilical vein
4) Vitelline vein
the Sinus venosus drains into what?
sinoatrial canal
T/F: only deoxygenated blood enters the sinoatrial canal
false- ALL blood enters through the sinoatrial canal during early development
which veins drain deoxygenated blood? oxygenated?
Deoxygenated blood- from The cardinal veins and vitelline
oxygenated- from umbilical vein
Left anterior cardinal vein becomes what after it is remodeled?
Caudal portion degenerates
Cranial portion becomes L. brachiocephalic v.
the Right anterior cardinal vein becomes which structures after remodeling?
Becomes:
1) R. brachiocephalic vein
2) superior vena cava
T/F: Posterior cardinal veins on both sides degenerate during development
true
what are the remnants of the posterior cardinal veins?
Root of azygos vein
common iliac veins
which umbilical vein degenerates entirely?
right umbilical vein
Left umbilical vein forms the _______ _______
ductus venosus
what is the Ductus venosus?
- venous shunt between the left umbilical vein and the IVC
- takes the oxygenated blood right to the heart, bypassing the sinusoidal capillaries of the liver
which horn of the sinus venosus becomes larger?
right horn
the left horn of the sinus venosus forms the _____ _____. what does this structure do?
forms the coronary sinus- it drains into the right atrium.
the distal portion of the dorsal aorta fuses to form what?
the descending part of the aorta.
how many pairs of pharyngeal arteries arise from the aortic sac?
5
1st pharyngeal arch arteries:
Largely Degenerate
Remaining Portions Become Maxillary arteries
2nd pharyngeal arch arteries:
Largely Degenerate
Remaining Portions Become Stapedial arteries (middle ear)
3rd pharyngeal arch arteries
Form the common carotid arteries
the proximal portions form the internal carotid arteries
what do the 4th pharyngeal arch arteries form?
hint: there are left and right side derivatives
right side- proximal right subclavian artery
left side- Forms aortic arch segment
goes from left common carotid to left subclavian arteries
T/F: the 5th pharyngeal arch arteries rarely form, and will completely degenerate if formed
true
what are the derivatives of the RIGHT SIDE 6th pharyngeal arch arteries?
Proximal portion forms proximal right pulmonary artery
distal degenerates
what are the derivatives of the LEFT SIDE 6th pharyngeal arch arteries?
Proximal portion forms proximal left pulmonary artery
distal portion forms the ductus arteriosus
the ductus arteriosus closes after birth and remains as the ____________________
closes after birth as ligamentum arteriosum
the recurrent laryngeal nerve hooks under the _________ arteries
6th pharyngeal arch
these nerves are dragged caudally during development
after development, the Left recurrent laryngeal n. hooks under ________ ________
ligamentum arteriosum (the remnant of the left 6th pharyngeal arch artery)
T/F: the right recurrent laryngeal nerve will hook under the right subclavian artery
true
the aortic sac will form the proximal portion of which 2 structures?
aortic arch and the brachiocephalic trunk
the pulmonary trunk & ascending aorta are both derived from the:
Truncus arteriosis
the left side of the dorsal aorta will eventually form what?
the rest of aortic arch distal to left subclavian artery
what are the adult derivatives of the vitelline arterial plexus?
Celiac trunk, SMA, IMA
which vessel carries deoxygenated blood from the fetus to the placenta?
umbilical artery
remember- arteries go away from the heart
Each umbilical artery arises from the caudal ______ ______
dorsal aorta
after birth, what will the proximal end of the umbilical arteries form?
- Internal iliac arteries
- internal vesical arteries
at birth, the Foramen ovale closes off as the _____ ______ and the ductus arteriosis closes off as the ______ ______
fossa ovalis
ligamentum arteriosum
what structure will the left umbilical vein become after birth?
ligamentum Teres hepatis- round ligament of liver
the ____________ will close off at birth to form the medial umbilical ligaments
distal umbilical arteries
what vein will ultimately form the hepatic portion of the inferior vena cava?
right vitelline vein
Right and left vitelline veins caudal to liver will form what?
the hepatic portal system
the left vitelline vein will do what?
degenerates between heart and liver
