QuestionSBA
QuestionChoice
The coronary sinus is formed from the left horn of the sinus venosus. It drains the great, middle, small and oblique coronary veins directly into the right atrium.
10001056
a
The coronary sinus
QuestionChoice
The aortic arch is formed from the bridging of the 4th left aortic arch between the ventral and left dorsal aorta. Up to 6 paired aortic arches initially form between the ventral aorta and paired dorsal aorta. Most of these atrophy but those remaining form the great vessels and their branches.
10001059
d
The adult aortic arch
QuestionChoice
The smooth right atrium is the adult structure formed from the right horn of the sinus venosus. It is separated from the right atrial appendage by the sulcus terminalis externally and crista terminalis internally and does not contain pectinate muscles.
10001057
b
The smooth right atrium
QuestionChoice
The right atrial appendage is the remnant of the primitive atrium on the cranial side of the sinus venosus. It is separated from the smooth right atrium by the sulcus terminalis externally and crista terminalis internally and contains pectinate muscles.

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10001060
e
The right atrial appendage
QuestionChoice
The aorticopulmonary (spiral) septum is formed from the septation of the truncus arteriosus by endocardial cushions and is aided by the infiltration of neural crest cells. Defects in this process can cause tetralogy of Fallot, a cyanotic congenital heart disease characterised by pulmonary stenosis, an over-riding aorta, a ventricular septal defect and right ventricular hypertrophy.
10001058
c
The aorticopulmonary septum
Concept
Chapter
2693
3875
Formation of heart chambers
Topic
171
Embryology
12758
Which structure is formed from the left horn of the embryonic sinus venosus?
a