LANDERS-DEV OF NS Flashcards
this is the term for development where we see fertilization, cleavage,morula and blastocyst take place?
embryogenesis taking 8 days
what is the bilaminar embryonic disk comprised of? what is this suspended between?
superior epiblast
inferior hypoblast
superior amniotic cavity
inferior yolk sac
what does the placenta form from?
trophoblast
what week does the primitive streak form? what is it?
week 3
inner cell mass is converted to the trilaminar disk
what is released in the body and used to detect early fetal life?
human chorionic gonadotropin (HCG) produced by the placenta
this is the anterior of the embryo?
prochordal plate
this is the posterior of the embryo?
cloacal membrane
how many days does it take before we see the notochord?
18 days
this development triggers the rapid proliferation of the surface ectoderm to invaginate and begin to form the embryonic nervous system?
the notochordal development
this is the development where we see the rapid proliferation of the neuroectoderm leading to the invagination of the NS forming an open tube structure from front to back?
neuralation
this substance is released into the CSF and leaks out into the amniotic cavity. This appears in the serum of the mother?
alpha fetoprotein
this vesicle, primary or secondary, results from the closing of both ends of the neural tube forming a growing tubular nervous system?
primary vesicle
what are the four parts of the primary vesicle?
prosencephalon (forebrain)
mesencephalon (midbrain)
rhomboencephalon (hindbrain)
spinal cord
this vesicle, primary or secondary, results from further growth and differentiation of the primary vesicle by the process of transverse segmentation? what are the parts?
secondary
prosencephalon (forebrain) -telencephalon -diencephalon mesencephalon (midbrain) rhomboencephalon (hindbrain) -metencephalon -myelencephalon spinal cord
what is the process of evagination occur?
it occurs as the cortical hemispheres, cerebellum, and special sensory capsule develop
