Block 4 Embryology Md 1 Cvs Part C

Front 1

Slide 34
Development of the Atrial Septum
Formation: composed of =

Back 1

septum primum
septum secundum
foramen primum
foramen secundum

Hint 1

Front 2

The crescent-shaped ______ _____ forms in the roof of the primitive atrium and grows toward the atrioventricular (AV) cushions in the AV canal.

Back 2

septum primum

Front 3

The foramen secundum forms in the center of the =

Back 3

septum primum

The crescent-shaped septum secundum forms to the

Hint 3

right of the septum primum.

Front 4

The______ -______ is the opening between the upper and lower limbs of the _______ ______

Back 4

foramen ovale

septum secundum.

Hint 4

Front 5

Back 5

Hint 5

Front 6

Before birth the foramen ovale allows blood to pass from the

Back 6

right atrium into the left atrium


Reflux of blood is prevented by the valve

Front 7

After birth the foramen ovale normally closes by fusion of the ____ ______ and the ______ _______

Back 7

septum primum

septum secundum.

Front 8

DEVELOPMENT OF RIGHT ATRIUM

Develops from:

Back 8

right horn of the sinus venosus
primitive atrium.

Front 9

right horn of the sinus venosus
& the
primitive atrium Develops the =

Back 9

RIGHT ATRIUM

Front 10

DEVELOPMENT OF RIGHT ATRIUM

sinus venosus develops a left horn which becomes the ____ _____ and a right horn which will be incorporated into the_____ ______

Back 10

coronary sinus

right atrium.

Front 11

_____ _____ develops a left horn which becomes the coronary sinus and a ____ ____ which will be incorporated into the right atrium.

Back 11

sinus venosus

right horn

Front 12

DEVELOPMENT OF RIGHT ATRIUM

The smooth part of the right atrium, the sinus venarum, is derived from the =

Back 12

sinus venosus

whereas the muscular part, the auricle, is derived from the =

Hint 12

primitive atrium.

Front 13

DEVELOPMENT OF RIGHT ATRIUM

The smooth part of the right atrium, the____ _______ , is derived from the sinus venosus whereas the____ _____ of the auricle, is derived from the primitive atrium.

Back 13

sinus venarum

muscular part,

The 2 portions are separated internally by the =
and externally by the =

Hint 13

crista terminalis

sulcus terminalis.

Front 14

DEVELOPMENT OF LEFT ATRIUM

Development of the left atrium occurs concurrently with that of the

Back 14

right atrium.

L atrium develops from:
2ct

Hint 14

pulmonary veins
Primordial atrium

Front 15

DEVELOPMENT OF LEFT ATRIUM
pulmonary veins
Primordial atrium
develope what =

Back 15

L atrium develops from:

Front 16

DEVELOPMENT OF LEFT ATRIUM
L atrium develops from:
2ct

Back 16

pulmonary veins
Primordial atrium

Front 17

DEVELOPMENT OF LEFT ATRIUM

During the early part of the _____ week an outgrowth of the pulmonary veins appear from the left atrium.

Back 17

4th wk

As the atrium expands, the primordial pulmonary vein and its main branches are gradually incorporated into the wall of the____ ____

Hint 17

left atrium.

Front 18

As a result 4 pulmonary veins are formed. Molecular studies have confirmed that atrial myoblasts migrate into the walls of the pulmonary veins.

The small left auricle is derived from the primordial atrium. Its internal surface has a rough trabeculated appearance

Back 18

.During ___ week an outgrowth of the pulmonary veins appear

Hint 18

4th

Front 19

Back 19

Hint 19

Front 20

The Interventricular (IV) Septum

Formation: has 3 parts:


Back 20

muscular part
membranous part
IV foramen

Front 21

The Interventricular (IV) Septum

***The muscular ___ _____
develops in the midline on the floor of the primitive ventricle and grows toward the fused AV cushions.

Back 21

IV septum

Front 22

IV foramen

This foramen is closed by the membranous IV septum, which forms by the proliferation and fusion of tissue from three sources: the

Back 22

***right bulbar ridge,
***left bulbar ridge,
AV cushions.

Front 23

Formation of the Aorticopulmonary (AP) Septum

Neural crest cells migrate from the =

Back 23

hindbrain region
through
pharyngeal arches 3, 4, 6

and invade both the truncal ridges and bulbar ridges.

Front 24

The_______ & ____ ridges grow and twist around each other in a _____ fashion and eventually fuse to form the
_____ ___________

Back 24

truncal and bulbar

spiral

AP septum.

Front 25

Formation of the Aorticopulmonary (AP) Septum

The AP septum divides the___________ __________ into the aorta and pulmonary trunk.

Back 25

truncus arteriosus and bulbus cordis

Hint 25

Front 26

Formation of the Aorticopulmonary (AP) Septum

The AP septum divides the truncus arteriosus and bulbus cordis into the ________ _________

Back 26

aorta and pulmonary trunk.