Questions and Answers
How many days does it take for a zygote with zona pellucida to reach the uterine cavity?
At what stage in spermatogenesis does independent assortment of chromosomes occur?
From which embryonic structure are tongue muscles derived?
What is the remnant of the distal umbilical artery?
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During which stage of spermatogenesis are diploid (2n) cells present?
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Which embryonic arch contributes to the development of the posterior one-third of the tongue?
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Study Notes
Zygote Development
- A zygote with zona pellucida reaches the uterine cavity in 4 days.
Spermatogenesis
- Independent assortment of paternal and maternal chromosomes occurs during meiosis I, primarily from primary to secondary spermatocyte.
- The transition from primary spermatocyte (2n) results in two secondary spermatocytes (n).
Tongue Muscle Development
- Tongue muscles originate from the occipital myotome.
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Epithelium Development:
- Anterior 2/3: Formed by lingual swellings of the first arch and tuberculum impar.
- Posterior 1/3: Derived from the large dorsal part of the hypobranchial eminence (3rd arch).
- Most posterior part: Small dorsal part from the hypobranchial eminence (4th arch).
- The muscle palatoglossus is an exception, derived from the 6th arch.
Remnants of the Distal Umbilical Artery
- The remnant of the distal umbilical artery is known as the medial umbilical ligament.
- Other options include:
- Ligamentum Teres: Not a remnant of the distal umbilical artery, but from the obliterated umbilical vein.
- Superior vesical artery: Supplies blood to the bladder.
- Ligamentum arteriosum: A remnant of the ductus arteriosus.
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Description
Test your knowledge on zygote development, spermatogenesis, and the origins of tongue muscles. This quiz covers key concepts related to meiosis and muscle development in embryology. Perfect for students learning about human development and anatomy.
