Order Embryology Discussion Assignmen

Order Embryology Discussion Assignment
Order Embryology Discussion Assignment
1. Which one of the following correctly
describes the order of embryological stages
of CNS development?
a. Blastogenesis, gastrulation, dorsal induction, ventral induction, neural proliferation,
neuronal migration, and axonal myelination
b. Dorsal induction, ventral induction, gastrulation, neural proliferation, neuronal
migration, and axonal myelination
c. Gastrulation ventral induction, dorsal
induction, neural proliferation, neuronal
migration, and axonal myelination
d. Neural proliferation, gastrulation dorsal
induction, ventral induction, neuronal
migration, and axonal myelination
e. Ventral induction, gastrulation, dorsal
induction, neural proliferation, axonal
myelination, and neuronal migration
2. Which one of the following statements
regarding gastrulation is most accurate?
a. It is the process by which the bilaminar
disc is converted into a trilaminar disc
b. It can result in lipomyelomeningocele if
disturbed
Order Embryology Discussion Assignment
c. It is not dependent on bone morphogenetic protein expression
d. It starts with closure of the cranial
neuropore
e. It occurs from embryonic days 10-12
3. Which one of the following statements about
primary neurulation is most accurate?
a. Anterior neuropore closure approximately occurs on D19
b. Disjunction results in formation of the spinal canal below the posterior neuropore
c. Fusion of the neural folds starts at the
anterior neuropore and proceeds caudally
in a zip-like fashion until it reaches the
posterior neuropore
d. Notochord induces the overlying ectoderm to differentiate into a flat area of
specialized neuroectoderm called the
neural plate
e. SHH/morphogen secretion on D14
causes the neural plate to form the median
hinge points and start invaginating along
its central axis to form a neural groove
(with neural folds on either side)
4. Which one of the following statements about
secondary neurulation and retrogressive differentiation is most accurate?
a. Important for the formation of the conus
medullary but not the filum terminale
b. Involves canalization of a caudal mesenchymal cell mass
c. Is completed by days 24-26 of embryonic
development
Order Embryology Discussion Assignment
d. Responsible for the formation of thoracic,
lumbar, sacral, and coccygeal neural tube
e. Retrogressive differentiation is a mitotic
process
5. Which one of the following statements about
Is ventral induction is most accurate?
a. It includes the development of the primary
brain fissure
b. It includes the development of the secondary
brain vesicles and brain flexures
c. It includes the formation of the neural plate
d. It includes the formation of the notochord
e. It includes primary neurulation
6. The diencephalon does not give rise to
which one of the following?
a. 3rd ventricle
b. Mamillary bodies
c. Optic vesicle
d. Posterior pituitary
e. Superior colliculus
7. Mesencephalon does NOT give rise to which
one of the following?
a. Cerebral aqueduct
b. Edinger-Westphal nucleus
c. Pineal body
d. Red nucleus
e. Substantia nigra
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