Embryology Flashcards
The neuro tube develops into what?
The spinal cord and the brain, ie. CNS
What forms the Peripheral Nervous System?
The neural crest cells that are “left behind”
Neural Crest cells “Left Behind” are responsible for the formation of what 5 components?
- PNS
- Dorsal root ganglia cells (cell bodies for all the sensory side of the PNS)
- Schwann cells
- Ganglia of the autonomic nervous system (sensory and postganglionic motor cells)
- Melanocytes in Statrum Basale of the epidermis
What are Schwann Cells?
Myelinating cells of the PNS. They are both sensory and motor.
What are the 4 plates that the developing Nuerotube is divided into
- roof
- floor
- alar
- basal
The Alar plate is located _____ to the sulcus limitans
Dorsal
The Basal plate is located _____ to the sulcus limitans
Anterior
The Alar plate forms which to parts of the developing neural tube?
- Sensory
- Assoication
The Basal plate forms which part of the developing neural tube?
- Forms the Motor part
- –including alpha and game motor neurons
What is the Sulcus Limitans?
A groove in the wall of the neural tube (oriented in the coronal plane) that separates Alar and Basal Plates
Where is the Sulcus Limitans located?
The dividing line is present in the developing spinal cord and into the brainstem, only as far as the developing midbrain
The Neural tube expands at which end into how many primary vesicles?
Rostral End into 3 primary vesicles
What are the 3 primary vesicles the developing neural tube expands into?
- ) Rhombencephalon
- ) Mesencephalon
- ) Prosencephalon
Which primary vesicles form the neurotube develop secondary vesicles?
- ) Rhombencephalon
3. ) Prosencephalon
What are the secondary vesicles developing from the Rhombencephalon?
Myelencephalon
—-medulla oblongata
Metencephalon
—-pons and cerebellum
