Heart Development Flashcards

1
Q

1st sign of a heart, solid horseshoe shaped cluster of cells

A

Primary heart field

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2
Q

Islands will unite and form a horseshoe shaped endothelial lined tube surrounded by myoblasts within the cardiogenic region called…

A

endocardial tubes

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3
Q

Lateral folding creates…

A

primordial heart tube

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4
Q

This repositions the developing heart

A

Cranial-Caudal folding

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5
Q

Attaches the heart tube to the dorsal side of pericardial cavity

A

dorsal mesocardium

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6
Q

Formed when the middle section of dorsal mesocardium disappears

A

Transverse Pericardial sinus

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7
Q

Different sections of developing heart from in–>out (inferior to superior in picture)

A

Spike A Volley Ball

  1. Sinus Venosus
  2. Primordial Atrium
  3. Promordial Ventricle
  4. Bulbus Cordis
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8
Q

2 parts that make up the Bulbus Cordis

A

Truncus Arteriosus and Conus Cordis

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9
Q

What does TRUNCUS ARTERIOSUS become?

A

Pulmonary trunk and aorta

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10
Q

What des CONUS CORDIS become?

A

Outflow tract of ventricles; caudal portion forms Right Ventricle

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11
Q

What does PRIMORDIAL VENTRICLE become?

A

Left ventricle

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12
Q

What does PRIMORDIAL ATRIUM become?

A

Right and left auricles and portions of the atria

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13
Q

What does SINUS VENOSUS become?

A

Coronary sinus and sinus venarum

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14
Q

Does the heart look to the right or left?

A

Right

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15
Q

Circulation through the primordial heart (day 30)

A

Sinus Venosus–Primordial atrium–av canal–left ventricle–IV foramen–Right ventricle–Conus cordis–Truncus arteriosus–aortic sac–pharyngeal arch aa–dorsal aortae

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16
Q

Sinus venosus receives venous blood from what 3 paired veins? (Medial to lateral)

A
  1. Vitelline vv
  2. Umbilical vv
  3. Common Cardinal vv
17
Q

what horn of the sinus venosus becomes larger and why?

A

Right Horn

Blood flow tot he heart shifts to the right side due to the remodeling of the 3 veins.

18
Q

Left sinus horn becomes what two structures?

A
  1. Oblique veins of the left atrium

2. Coronary Sinus

19
Q

What happens to the right sinus horn?

A

Becomes incorporated intot the right atrium to form the smooth wall portion

20
Q

What is the name of the entrance formed by the right sinus horn merging with the right atrium?

A

Sinus Venarum

21
Q

2 ways to form septa of the heart

A
  1. Endocardial cushions (Atria)

2. Merging two expanding portions of the wall (ventricles)

22
Q

Around the end of week 4, a crest of tissue grows from the roof of the common atrium, this structure is called?

A

Septum Primum

23
Q

Perforations in septum primum form…

A

ostium secundum

24
Q

Grows just to the right of septum primum and creates what opening?

A

Septum secundum grows inferior and creates foramen ovale

25
how does foramen ovale close and what does it form?
A change in pressure causes septum primum to adhere to septum secundum creating the FOSSA OVALIS
26
Complete closure of the interventricular foramen is done by what and forms what?
Done by outgrowth of inferior endocardial cushion and forms the membranous part of the interventricular septum
27
* Most common congenital heart defect | * Failure of IV septum to completely form
Ventricular Septal Defect (VSD)