Exam 3: Nervous System Development I Flashcards
What separates the mesencephalon from the rhombencephalon?
Cephalic flexure
What separates the rhombencephalon from the spinal cord?
Cervical flexure
What does the prosencephalon divide into?
Telencephalon & diencephalon
What does the telencephalon divide into?
Paleocortex, Corpus striatum, & neocortex
What does the diencephalon divide into?
Epithalamus, thalamus, hypothalamus, & infundibulum
What does the mesencephalon divide into?
Stays mesencephalon then into…
Tectum, tegmentum, & cerebral peduncles
What does the rhombencephalon divide into?
Metencephalon & myelencephalon
What does the metencephalon divide into?
Cerebellum & pons
What does the myelencephalon divide into?
Medulla
What is the epithelial progression from early to late neural tube wall formation?
Early neural epithelium: simple cuboidal
Neural plate: simple columnar
Early neural tube wall: pseudostratified
Late neural tube wall: stratified
What occurs at the lumenal wall and external limiting membrane of the neural tube?
Lumenal wall: mitosis occurs
External limiting membrane: DNA replication
What is the result of neural tube cells if the metaphase plate is perpendicular to the inner margin?
Daughter cells remain proliferative
What is the result of neural tube cells if the metaphase plate is parallel to the inner margin?
Daughter cells close to lumen remain proliferative.
Daughter cells further from lumen become postmitotic and migrate to external limiting membrane
What do postmitotic neuroblasts express?
Notch receptor
What demarcates the roof and basal plates of the neural tube, separating sensory and motor zones?
Sulcus limitans