PNS development and Neurocristopathies Flashcards
Central Nervous System
Consists of the brain and spinal cord and is protected by the cranium and verterbal column
Peripheral nervous system
Consists of all components of the nervous system outside the CNS. This includes cranial nerves and ganglie, spinal nerves and ganglie, autonomic nerves and ganglia, and the enteric nervous system (only exists in the gut).
What is the autonomic nervous system? How many neurons connect the pathway from spinal cord to target structues?
What are its two divisions?
Peripheral nervous system development arises from what? (2 main things)
What are the two groups of cells outside the neural tube that the PNS develops from? Which is the primary contributor?
The PNS develops in an ___ system, essentially in a ___ to ____ sequence
integrated; cranial; caudal
Neurlation is an inductive event that occurs where? and results in the formation of what? (which gives rise to what?). This can be subvidided into primary (which is what) and secondary (which is what?)
Primary neuralation occurs when? Continues through when?
3rd week, immediately following gastrulation. Primary neuraltion continues through the 4th week
In the region of the 4th - 6th pairs of somites, the ___plate, and ___groove develop on the posterior aspect of the trilaminar embryo. From the the process continues both ___ and ____
What induces the overlying ectoderm to differentiate into the neural plate? (2 things)
Unfused potion at the cranial and caudal ends are referred to as what?
Anterior neurospores close at what?
Posterior neurospores close at what?
Anterior = 24-25 days
Posterior close at 26-27 days
What markes the end of primary neurulation?
Closure of the neurospores
