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Embryonic development week three overview
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1
Question
What is the time period for the third week of embryonic development?
Page 1
Answer
Days 15 to 21 post-fertilization
2
Question
What major process begins in the third week of embryonic development?
Page 1
Answer
Gastrulation
3
Question
What is established during the third week of embryonic development?
Page 1
Answer
Basic body plan
4
Question
What are neural crest cells?
Page 2
Answer
Cells that form at the edges of neural folds and migrate to form various structures
5
Question
When do neural crest cells begin to migrate?
Page 2
Answer
After closure of the neural tube
6
Question
What structures do neural crest cells contribute to?
Page 2
Answer
Dorsal root ganglia, sympathetic ganglia, adrenal medulla, enteric ganglia
7
Question
What is the dorsal root ganglion derived from?
Page 2
Answer
Neural crest cells
8
Question
What is the sympathetic ganglion formed by?
Page 2
Answer
Neural crest cells
9
Question
What contributes to the developing adrenal gland?
Page 2
Answer
Neural crest cells
10
Question
What is the urogenital crest associated with?
Page 2
Answer
Neural crest cell migration
11
Question
What are preaortic ganglia derived from?
Page 2
Answer
Neural crest cells
12
Question
What are enteric ganglia formed by?
Page 2
Answer
Neural crest cells
13
Question
What gastrulation achieve in terms of embryonic layers?
Page 3
Answer
Transforms bilaminar disk into trilaminar
14
Question
What structures appear during gastrulation?
Page 3
Answer
Primitive streak, primitive node, notochord
15
Question
What is visible in a 16-day embryo?
Page 3
Answer
Primitive streak and primitive node
16
Question
What is the appearance of an 18-day embryo?
Page 3
Answer
Pear-shaped with wider cephalic region
17
Question
What extends ventrally from the primitive node?
Page 3
Answer
Notochord
18
Question
What is the length of an 18-day human embryo?
Page 3
Answer
1.25 mm
19
Question
What forms at 19 days in the embryo?
Page 4
Answer
Neural folds and neural groove
20
Question
What are somites visible as at 20 days?
Page 4
Answer
Paired blocks along the axis
21
Question
What is the primitive streak's role at 19-20 days?
Page 4
Answer
Site of cell migration for gastrulation
22
Question
What biological objective is met by forming three germ layers?
Page 5
Answer
Establishment of ectoderm, mesoderm, endoderm
23
Question
What body axes are established in the third week?
Page 5
Answer
Cranio-caudal, dorso-ventral, right-left
24
Question
What processes start in the third week besides gastrulation?
Page 5
Answer
Neurulation and somitogenesis
25
Question
When does the primitive streak appear?
Page 6
Answer
Around day 15 in the epiblast
26
Question
What does the primitive streak mark?
Page 6
Answer
The principal body axis
27
Question
How do epiblast cells contribute during primitive streak formation?
Page 6
Answer
Migrate inward by invagination
28
Question
What is the primitive node also known as?
Page 7
Answer
Hensen's node
29
Question
What is the primitive pit?
Page 7
Answer
Central depression in the primitive node for cell ingress
30
Question
What role does the primitive node play?
Page 7
Answer
Organizer of the embryonic axis