Embryo HW Questions Flashcards
What are the paraxial mesodermal structures that form alongside the neural tube?
somites
Match the primordial gray matter to the cells it contains and the structure it becomes in the mature cord.
-ventral horn
-dorsal horn
-sensory neurons
-motor neurons
-interneurons
> alar plate
basal plate
neither
ventral horn= basal plate
dorsal horn = alar plate
sensory neurons = neither
motor neurons= basal plate
interneurons= alar plate
Which statement lists the three components of a somite?
A) epiblast, dermablast, myoblast
B) sclerotome, myotome, dermatome
C) ectoderm, mesoderm, endoderm
D) scleroderm, myoderm, epiderm
B) sclerotome, myotome, dermatome
A remnant of the notochord forms the _______________
nucleus pulposus
Primordial motor and sensory axons form ventral and dorsal nerve roots that join together ______________ the intervertebral foramen to form a spinal nerve.
proximal to
What type of structure forms in between the space created by re-segmentation?
Intervertebral disc
Which event causes the sclerotome to separate and the caudle portion to fuse with rostral portion?
A) resegmentation
B) Migration of the segmental arteries through the scleratome
C) Closure of the caudal neuropores
D) aggregation of neural crest cells
A) resegmentation
What do sclerotome cells eventually form that surround the neural tube?
Neural arch
Arrange the correct order of gray matter development in the embryonic spinal cord.
-ectoderm
-neuroepithelial cells
-neuroectoderm
-neuroblast cells
-neuron cell bodies
-ectoderm
-neuroectoderm
-neuroepithelial cells
-neuroblast cells
-neuron cell bodies
Where do sensory neurons initially appear?
Dorsal root ganglia
Which germ layer does the epiblast layer become in the trilaminar disc?
ectoderm
The following describe characteristics of the notochord EXCEPT:
A) Is the first primordial axial support of the embryo
B) Becomes the nucleus pulposus
C) Formed by aggregation of mesoderm cells beneath the primitive streak
D) Provides the structure around which the vertebral arches to form
D) Provides the structure around which the vertebral arches to form
What happens during invagination?
A) Formation of primitive streak
B) Aggregation of mesoderm under primitive streak
C) Epiblast cells migrate through the primitive streak
D) Formation of the primitive node
C) Epiblast cells migrate through the primitive streak
What is the main goal of gastrulation?
formation of the three primary germ layers
Which germ layer gives rise to the brain and spinal cord?
ectoderm
Which germ layer gives rise to neural crest cells?
ectoderm
Which germ layer gives rise to the notochord?
mesoderm
Which germ layer gives rise to somites?
mesoderm
Which germ layer gives rise to epithelial linings?
endoderm
What type of cell gives rise to all three primary germ layers?
epiblast
These statements correctly describe the primitive streak EXCEPT:
A) Appears at the caudal end of the bilaminar disc
B) Initiates gastrulation
C) Establishes the major body axises of the embryo
D) Gives rise to the notochord
D) Gives rise to the notochord
What are the primary germ layers?
ectoderm, mesoderm, and endoderm
Fusion of the neural tube begins in the ________ region
cervical
Which region of the embryonic disc does the neural tube initially close?
Cervical
What event initiates the neurulation phase in embryonic development?
A) Fusion of neural folds
B) Development of somites
C) Migration of neural crest cells
D) Chemicals released by notochord
D) Chemicals released by notochord
The following describes the neural plate EXCEPT:
A) Arises from ectoderm
B) Differentiates into neuroectoderm
C) Thickened area around the primitive streak
D) Forms the brain and spinal cord
C) Thickened area around the primitive streak
These statements are correct about neural crest cells EXCEPT?
A) Form dorsal root ganglia
B) Differentiate into paraxial somites
C) Develop at lateral margin of neural plate
D) Arise from ectoderm
B) Differentiate into paraxial somites
What is the goal of neurulation?
Formation of the embryonic brain and spinal cord
What event forms the neural tube?
A) Opening of neuropores
B) Fusing of neural folds
C) Formation primary brain vesicles
B) Fusing of neural folds
The rostral neuropores close around day 25 and the caudate neuropores close around day ____
28
These are the primary brain vesicles formed by neurulation EXCEPT:
A) Diencephalon
B) Mesencephalon
C) Proencephalon
D) Rhombencephalon
A) Diencephalon
