Lecturio 5. Endoderm Derivatives and the Gut Tube

Question 1

Endoderm Derivatives and the Gut Tube

The splanchnopleure, consisting of (1)____, will pinch together.

Answer 1

endoderm and the visceral layer of lateral plate mesoderm

Question 2

Endoderm Derivatives and the Gut Tube

___ will pinch together.

Answer 2

The splanchnopleure

(consisting of endoderm and the visceral layer of lateral plate mesoderm)

Question 3

Endoderm Derivatives and the Gut Tube

The splanchnopleure, consisting of endoderm and the visceral layer of lateral plate mesoderm, will pinch together.

Simultaneously, ____ are forming in the mesoderm alongside the notochord, just inferior to the somites.

Answer 3

large dorsal aortae

Question 4

Endoderm Derivatives and the Gut Tube

The splanchnopleure, consisting of endoderm and the visceral layer of lateral plate mesoderm, will pinch together.

Simultaneously, large dorsal aortae are forming in (1)____ alongside the notochord, just inferior to (2)____

Answer 4

1. the mesoderm
2. the somites.

Question 5

Endoderm Derivatives and the Gut Tube

→ IDENTIFY

Answer 5

endoderm and the visceral layer of lateral plate mesoderm

Question 6

Endoderm Derivatives and the Gut Tube

(1)___ migrates anteriorly, (2)____ meets on the midline

→ Part of the gut tube from the (now) second yolk sac

Answer 6

1. Somatopleure
2. the splanchnopleure

Question 7

Endoderm Derivatives and the Gut Tube

On day 25, ____ has differentiated into an early kidney and the dorsal aortae are fusing

Answer 7

the intermediate mesoderm

Question 8

Endoderm Derivatives and the Gut Tube

Somatopleure migrates anteriorly, the splanchnopleure meets on the midline

→ Part of the gut tube from_____

Answer 8

the (now) second yolk sac

Question 9

Endoderm Derivatives and the Gut Tube

On day 25, the intermediate mesoderm has differentiated into (1)____ and (2)___ are fusing

Answer 9

1. an early kidney
2. the dorsal aortae

Question 10

Endoderm Derivatives and the Gut Tube - DAY 25

→ Identify

Answer 10

Question 11

Endoderm Derivatives and the Gut Tube

Day 26:

• Gut tube is suspended by ____
• ____ exists briefly but disappears from everywhere except for the liver

Answer 11

• the dorsal mesentery, a remnant of the visceral layer of lateral plate mesoderm
• Ventral mesentery

Question 12

Endoderm Derivatives and the Gut Tube

Day 26:

• Gut tube is suspended by the dorsal mesentery, a remnant of ____
• Ventral mesentery exists briefly but disappears from everywhere except for ___

Answer 12

• the visceral layer of lateral plate mesoderm
• the liver

Question 13

Endoderm Derivatives and the Gut Tube

Day 26:

• ____ is suspended by the dorsal mesentery, a remnant of the visceral layer of lateral plate mesoderm
• Ventral mesentery exists briefly but disappears from everywhere except for the liver

Answer 13

GUT TUBE

Question 14

Endoderm Derivatives and the Gut Tube

Day 26:

→ IDENTIFY

Answer 14

Question 15

Endoderm Derivatives and the Gut Tube

Day 26:

• ____ fuse to create the anterior body wall and seal in the gut tube
• The secondary yolk sac is now located ____, connect to a small portion of the gut tube by a duct

Answer 15

• Right and left somatopleure
• outside the body

Question 16

Endoderm Derivatives and the Gut Tube

Day 26:

• Right and left somatopleure fuse to create ____ and seal in ____
• ____ is now located outside the body, connect to a small portion of the gut tube by a duct

Answer 16

• the anterior body wall; the gut tube
• The secondary yolk sac

Question 17

Endoderm Derivatives and the Gut Tube

Day 26:

• Right and left somatopleure fuse to create the anterior body wall and seal in the gut tube
• The secondary yolk sac is now located outside the body, connect to ____ by a duct

Answer 17

a small portion of the gut tube

Question 18

Endoderm Derivatives and the Gut Tube

Heart develops from (1)____ in the (2)___ layer of lateral plate mesoderm

→ hollow endocardial tubes on each side are brought together as the splanchnopleure folds and the gut tube forms

Answer 18

1. a cardiogenic area
2. visceral

Question 19

Endoderm Derivatives and the Gut Tube

Heart develops from a cardiogenic area in the visceral layer of (1)____

→ (2)____ on each side are brought together as the splanchnopleure folds and the gut tube forms

Answer 19

1. lateral plate mesoderm
2. hollow endocardial tubes

Question 20

Endoderm Derivatives and the Gut Tube

Heart develops from a cardiogenic area in the visceral layer of lateral plate mesoderm

→ hollow endocardial tubes on each side are brought together as (1)___ folds and (2)____ forms

Answer 20

1. the splanchnopleure
2. the gut tube

Question 21

Endoderm Derivatives and the Gut Tube

→ identify

Answer 21

Question 22

Endoderm Derivatives and the Gut Tube

(1)____ connects with blood vessels and the aorta that are forming elsewhere in the embryo

→ heart tube begins beating about (2)___

Answer 22

1. Fused endocardial tube
2. day 22

Question 23

Endoderm Derivatives and the Gut Tube

Fused endocardial tube connects with (1)____ that are forming elsewhere in the embryo

→ heart tube begins (2)___ about day 22

Answer 23

1. blood vessels and the aorta
2. beating

Question 24

Endoderm Derivatives and the Gut Tube

→ IDENTIFY

Answer 24

Question 25

**Endoderm Derivatives and the Gut Tube** **→ What is in the red circle**

Answer 25

The developing heart