Lecture 6- Development of the Heart

Question 1

Sinus venosus recieves blood from 3 paired veins

Answer 1

1. vitelline vv
2. umbilical vv.
3. common cardinal vv.

Question 2

Left sinus horn becomes:

Answer 2

oblique vv. of the left atrium

coronary sinus

Question 3

Right sinus horn is large and becomes incorporated into the…. to form…
It’s entrance is…. which is flanked by R. and L. venous valves

Answer 3

• R. atrium
• smooth walled part
• sinuatrial

Question 4

When right sinus horn is incorporated into wall it becomes

Answer 4

sinus vernarum

Question 5

Around end of week 4, a crest of tissue grows from the roof of the common atrium called the…

Answer 5

septum primum

Question 6

opening below the septum primum and the endocardial cushions is the…

Answer 6

ostium primum

Question 7

The ostium primum closes and the cell death produces perforations in septum primum which coalesce to form…

Answer 7

ostium secundum

Question 8

As holes in the septum primum coalesce to form the ostium secundum, a thicker…. develops from the roof of the primordial atrium, slightly to the right of…

Answer 8

septum secundum

septum primum

Question 9

Septum secundum grows inferiorly and develops opening:

Answer 9

foramen ovale

Question 10

After birth, the pressure in the…. increases as the blood returns from the lungs.
The septum primum is pressed against the septum secundum and adheres to it, permanently closing the…. and forming the…

Answer 10

• left atrium
• foramen ovale
• fossa ovalis

Question 11

during looping at 23-28 days, the primitive ventricles move…. and to the…

Answer 11

ventrally and to the right

Question 12

during looping at 23-28 days, atrial region moves … and to the….

Answer 12

dorsally and to the left

Question 13

The truncus arteriosus becomes the… and…

Answer 13

pulmonary trunk and aorta

Question 14

the conus cordis becomes the….

Answer 14

outflow of ventricles, caudal portion becomes RV

Question 15

The bulbus cordis is made up of the… and…

Answer 15

truncus arteriosus

conus cordis

Question 16

the primordial ventricle becomes the

Answer 16

LV

Question 17

the primordial atrium becomes the….

Answer 17

R/L auricles and portion of atria

Question 18

The sinus venosus becomes

Answer 18

coronary sinus and sinus vernarum

Question 19

The AV sulcus is between

Answer 19

primordial ventricle and primordial atrium

Question 20

The bulboventricular sulcus is btn the

Answer 20

conus cordis (of the bulbus cordis) and the primordial ventricle

Question 21

sinus venosus receives blood from 3 paired veins

Answer 21

1. vitelline
2. umbilical
3. common cardinal

Question 22

left sinus horn becomes

Answer 22

oblique veins of the left atrium

coronary sinus

Question 23

Right horn of sinus venosus becomes…. as a result of remodeling of the vitellline, umbilical and cardinal vv

Answer 23

larger

Question 24

septum secundum develops slightly to…. of septum primum and develops this opening:

Answer 24

right

foramen ovale