Lecturio 3. Ectoderm Derivatives and Neurulation Flashcards
Which state is the embryo in during neurulation?
The Embryo is now in a trilaminar state.
Ectoderm folds to create ____
Endoderm folds to create ____
- ____ folds to create central nervous system and skin
- ____ differentiates into somites, intermediate mesoderm, and lateral plate mesoderm
- ____ folds to create the lining of the gut tube
- Ectoderm
- Mesoderm
- Endoderm
Formation of the Neural Tube
→ IDENTIFY
Formation of the Neural Tube
What are the three embryonic germ layers originated from the epiblast?
ectoderm, mesoderm, and endoderm
Formation of the Neural Tube
Mesoderm subdivided into ____ (3)
paraxial mesoderm, intermediate mesoderm, and lateral plate mesoderm
Formation of the Neural Tube
Mesoderm subdivided into paraxial mesoderm, intermediate mesoderm, and lateral plate mesoderm
→ lateral plate mesoderm develops into ___
- supporting tissues of GI tract
- Body wall
- Limbs
Formation of the Neural Tube
Mesoderm subdivided into paraxial mesoderm, intermediate mesoderm, and lateral plate mesoderm
→ intermediate mesoderm develops into ___
Urogenital system
Formation of the Neural Tube
Signals from ____ drive changes in the nearby tissues.
the notochord
Formation of the Neural Tube
Ectoderm overlying the notochord thickens
→ ____ develops on the midline
neural groove
Formation of the Neural Tube
Day 20: neural folds on either side of the neural groove (1)___ and (2)____ each other
- enlarge
- approach
Formation of the Neural Tube
Day 20: ____ on either side of the neural groove enlarge and approach each other
neural folds
Formation of the Neural Tube
→ IDENTIFY
Formation of the Neural Tube
How is the neural tube formed?
Both neural folds begin to fuse, create the neural tube
Formation of the Neural Tube
Day 21: Both folds begin to fuse, create the neural tube; will become _____
the central nervous system, composed of the brain, brainstem, and spinal cord
Formation of the Neural Tube
Development of the nervous system is linked to the development of _____
the musculoskeletal system, particularly the spinal cord
Neural Tube and Neural Crest Cells
___ closes above the neural tube, enclosing the tube within the mesoderm just dorsal to the notochord.
The surface ectoderm
Neural Tube and Neural Crest Cells
The surface ectoderm closes above ____, enclosing the tube within the mesoderm just dorsal to the notochord.
the neural tube
Neural Tube and Neural Crest Cells
The surface ectoderm closes above the neural tube, enclosing the tube within ____ just dorsal to the notochord.
the mesoderm
Neural Tube and Neural Crest Cells
The surface ectoderm closes above the neural tube, enclosing the tube within the mesoderm just dorsal to ___
the notochord.
Neural Tube and Neural Crest Cells
→ Identify
Neural Tube and Neural Crest Cells
→ identify
Neural Tube and Neural Crest Cells
How is the neural crest formed?
It is formed by a set of ectodermal cells that move into the mesoderm on either side of the neural tube
Neural Tube and Neural Crest Cells
→ IDENTIFY
Neural Tube and Neural Crest Cells
→ IDENTIFY
Cranial and Caudal Neuropores
Day 22: Neural folds begin “zipping” together near the middle of the embryo
→ neural tube closes ____ (positions of embryo)
cranially and caudally
Cranial and Caudal Neuropores
Day 22: Neural folds begin “zipping” together near ____
→ neural tube closes cranially and caudally
the middle of the embryo
Cranial and Caudal Neuropores
Day 22: ___ begin “zipping” together near the middle of the embryo
→ neural tube closes cranially and caudally
Neural folds
Cranial and Caudal Neuropores
→ Identify
Cranial and Caudal Neuropores
→ Identify
Cranial and Caudal Neuropores
Leaves (exit from) (1)____ and (2)___ that are open to the amnion; will also close and enclose neural tube
- cranial neuropore
- a caudal neuropore
Cranial and Caudal Neuropores
- Cranial portion of neural tube: enlarges to become ___
- Caudal portion of neural tube: remains tubular, becomes ____
- the brain
- the spinal cord
Cranial and Caudal Neuropores
→ identify
Cranial and Caudal Neuropores
→ identify
