Ectoderm/ Nervous System Flashcards
What name is used to describe the lateral edges of the neural plate?
Neural folds
On what day of human development does the cranial neuropore close?
24 days
In the developing neural tube what name is given to an immature neuron?
Neuroblast (or primitive nerve cell)
In the developing neural tube where would you find neuronal progenitors?
Ventricular Zone
In the developing neural tube where would you find radial glial cells?
Ventricular Zone
Neurogenic phase progenitor cells divide asymmetrically. What do they form?
One dividing cell and one immature neuron or glia
Late phase progenitor cells divide assymetrically. What do they form?
One immature neuron and one immature glia.
Which cells wrap axons of the central nervous system in a myelin sheath?
Oligodendrocytes
What is the main function of the myelin sheath that surrounds many axons?
To increase the conduction velocity of axons.
In developing spinal cord, what neurons are formed by the alar plates?
Sensory Interneurons
In the spinal cord, where would you find the nuclei of sensory neurons?
Dorsal Root Ganglia
Which of these animals does not possess a neural crest during embryogenesis?
Select one:
Amphioxus lanceolatum (Lancelot)
Xenopus laevis (frog)
Danio rerio (zebrafish)
Gallus gallus (chicken)
Mus musculus (mouse)
Amphioxus lanceolatum (Lancelot)
What hormone is secreted by Chromaffin cells?
Adrenalin
Which part of the neural tube do most enteric neurons derive?
Rhombencephalon
Which of the three CNS meningeal layers are formed by the neural crest?
Arachnoid, Pia Mater
