Podcast
Questions and Answers
Which statement accurately describes spermatogenic cells?
Which statement accurately describes spermatogenic cells?
- Spermatids directly differentiate into spermatogonia.
- Type A spermatogonia undergo meiosis to form primary spermatocytes.
- Sertoli cells directly differentiate into spermatogonia.
- Type B spermatogonia undergo mitosis and give rise to primary spermatocytes. (correct)
From which structure do the umbilical arteries and veins derive?
From which structure do the umbilical arteries and veins derive?
- The allantois (correct)
- The yolk sac
- The chorion
- The amnion
Where is the primitive streak first visible in the embryo?
Where is the primitive streak first visible in the embryo?
- Caudal-dorsal region (correct)
- Lateral region
- Anterior region
- Cranial-ventral region
Which embryonic structure does NOT develop during the second week of embryonic development?
Which embryonic structure does NOT develop during the second week of embryonic development?
What factors are released by notochord cells to induce the neural plate?
What factors are released by notochord cells to induce the neural plate?
Which event occurs latest during human embryo development?
Which event occurs latest during human embryo development?
Which of these is NOT a derivative of neural crest cells?
Which of these is NOT a derivative of neural crest cells?
The most cranial migrating of ingressing Mesodermal cells from the?
The most cranial migrating of ingressing Mesodermal cells from the?
Which structures become modified to form the primary umbilical vesicle (yolk sac)?
Which structures become modified to form the primary umbilical vesicle (yolk sac)?
Which structure is NOT an extra embryonic structure that is formed during the second week of embryonic development?
Which structure is NOT an extra embryonic structure that is formed during the second week of embryonic development?
Extracellular vacuoles that appear in the syncytiotrophoblastic layer, and form:
Extracellular vacuoles that appear in the syncytiotrophoblastic layer, and form:
In which phase of the menstrual cycle does implantation typically occur?
In which phase of the menstrual cycle does implantation typically occur?
At which stage of embryonic development does implantation take place?
At which stage of embryonic development does implantation take place?
Considering these developmental events, which is the earliest that occurs? Digits separated, limbs move, or neuropores close?
Considering these developmental events, which is the earliest that occurs? Digits separated, limbs move, or neuropores close?
At what folliculogenesis stage do oocytes have 1N (23) chromosome number FIRST?
At what folliculogenesis stage do oocytes have 1N (23) chromosome number FIRST?
What is NOT typically observed in sperm cells during fertilization?
What is NOT typically observed in sperm cells during fertilization?
Which morphological sign confirms that normal fertilization has occurred in the ooplasm?
Which morphological sign confirms that normal fertilization has occurred in the ooplasm?
Which statement accurately describes oogenesis?
Which statement accurately describes oogenesis?
What is the state of an oocyte within a primordial follicle?
What is the state of an oocyte within a primordial follicle?
What is the visible sign that an oocyte has finished the first meiotic division (meiosis 1)?
What is the visible sign that an oocyte has finished the first meiotic division (meiosis 1)?
Flashcards
Spermatogenic Cells
Spermatogenic Cells
Type B spermatogonia divide by mitosis, producing primary spermatocytes.
Origin of Umbilical Arteries & Veins
Origin of Umbilical Arteries & Veins
These blood vessels originate from the allantois during embryonic development.
Primitive Streak Appearance
Primitive Streak Appearance
This structure first appears at the posterior end of the embryo.
Structure NOT in Week 2
Structure NOT in Week 2
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Notochord Induction Factors
Notochord Induction Factors
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Timing of Neck Development
Timing of Neck Development
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NOT Neural Crest Derivative
NOT Neural Crest Derivative
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Cranial Migration Source
Cranial Migration Source
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Primary Umbilical Vesicle Formation
Primary Umbilical Vesicle Formation
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NOT Formed in Week Two
NOT Formed in Week Two
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Lacunae Formation
Lacunae Formation
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Implantation Phase
Implantation Phase
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Implantation Stage
Implantation Stage
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Developmental Events Order
Developmental Events Order
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Oocyte with 1N Chromosomes
Oocyte with 1N Chromosomes
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NOT Seen In Fertilization
NOT Seen In Fertilization
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Normal Fertilization Sign
Normal Fertilization Sign
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Oogenesis Completion
Oogenesis Completion
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Primordial Follicle Oocyte
Primordial Follicle Oocyte
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Sign of Meiosis 1 Completion
Sign of Meiosis 1 Completion
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Does NOT Happen In Spermiogenesis
Does NOT Happen In Spermiogenesis
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Spermiogenesis Definition
Spermiogenesis Definition
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2nd Polar Body NOT Extruded Result
2nd Polar Body NOT Extruded Result
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HCG Production Site
HCG Production Site
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NOT a Result of Decidual Reaction
NOT a Result of Decidual Reaction
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Where Is the Primitive Streak?
Where Is the Primitive Streak?
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Study Notes
- Type B spermatogonia undergo mitosis, leading to the production of primary spermatocytes.
- Umbilical arteries and veins originate from the allantois.
- The primitive streak initially appears in the caudal-dorsal region of the embryo.
- The notochord does not develop during the second week of embryonic development.
- Cells of the notochord secrete factors, including chordin and nerve growth factor, that induce the overlying ectoderm to form the neural plate.
- The establishment of the neck region occurs latest among the developmental events of the human embryo listed.
- Somatomotor neurons of the PNS are not derived from neural crest cells.
- The most cranial migration of ingressing mesodermal cells originates from the cardiogenic mesoderm.
- The exocoelomic membrane and cavity are modified to form the primary umbilical vesicle (yolk sac).
- The epiblast is not an extra embryonic structure that is formed during the second week of embryonic development.
- Extracellular vacuoles in the syncytiotrophoblastic layer form the lacunae, which fill with maternal blood. These supply oxygen and nutrients to the implanted embryo.
- Implantation takes place during the secretory/progestational phase of the menstrual cycle.
- Implantation occurs at the blastocyst stage of embryonic development.
- The correct sequence of developmental events from earliest to latest is: both neuropores close, limbs and trunk start to show spontaneous movements, and the digits of the hands are separated.
- The correct sequence of developmental events from latest to earliest : First the digits of the hands are separated second limbs and trunk start to show spontaneous movements Third, both neuropores close.
- An oocyte first possesses a 1N (23) chromosome number at the secondary follicle stage.
- Zona reaction is not observed in sperm cells during fertilization.
- The presence of 2 pronuclei (PN) and 2 polar bodies (PB) is a morphological sign of normal fertilization in the ooplasm.
- Oogenesis will not conclude if fertilization does not occur.
- A primordial follicle contains a primary oocyte (2n) arrested in Prophase 1.
- The presence of the first polar body indicates that an oocyte has completed the first meiotic division (meiosis 1).
- Meiosis does not proceed during spermiogenesis, it happens during spermatogenesis.
- Spermiogenesis refers to the morphologic differentiation of spermatid cells.
- Failure to extrude the 2nd polar body may result in a zygote with 3N chromosome number.
- Syncytiotrophoblasts produce the pregnancy hormone HCG.
- Endometrium thickening is not a result of decidual reaction.
- The primitive streak is first visible in the caudal – dorsal region of the embryo.
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