Embryo: Trilaminar Embryo - 3rd Week Flashcards Preview

DAA > Embryo: Trilaminar Embryo - 3rd Week > Flashcards

Flashcards in Embryo: Trilaminar Embryo - 3rd Week Deck (10)
Loading flashcards...
0
Q

What is the primitive streak?

A

A groove on the surface of the caudal end of the epiblast at about day 16

1
Q

What happens during Gastrulation?

A
  1. Formation of 3 germ layers: the ectoderm, mesoderm, and endoderm
  2. Cranial-caudal (longitudinal) axis; bilateral symmetry
2
Q

What is the buccopharyngeal membrane?

A

Thickened hypoblast at cephalic region

3
Q

What tissue does the buccopharyngeal membrane lack?

A

Mesoderm

4
Q

The cloacal membrane end becomes what?

A

Anus

5
Q

What is the depression on the node referred to as?

A

Primitive pit

6
Q

The notochord process (hollow tube) becomes what?

A

Notochordal plate then notochord

7
Q

What tissues form the notochord?

A

Mesoderm

8
Q

What is the notochord?

A
  1. Forms in cranial to caudal direction
  2. basis for axial skeleton
  3. induces neural plate formation in ectoderm - CNS
  4. powerful inducer of surrounding structures in mesoderm and endoderm
9
Q

Where is the notochord located?

A

Midline from the primitive pit to the buccopharyngeal membrane in the mesodermal layer