Development of Integumentary System
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Questions and Answers

Which layer of the skin is derived from surface ectoderm?

  • Dermis
  • Epidermis (correct)
  • Mesoderm
  • Hypodermis

    • At what week of embryonic development do simple cuboidal epithelial cells start to proliferate and form two layers of squamous epithelium?

  • 7 Weeks (correct)
  • 3 Weeks
  • 9 Weeks
  • 5 Weeks

    • What is the process by which the periderm undergoes keratinization and desquamation?

  • Melanization
  • Exfoliation
  • Cornification
  • Keratinization (correct)

    • What is the name of the layer that replaces the periderm and forms the future stratum germinativum?

    <p>Basal layer</p> Signup and view all the answers

    What are the two layers of squamous epithelium formed at 7 weeks of embryonic development?

    <p>Periderm and Basal layer</p> Signup and view all the answers

    What is the name of the substance formed by the complete exfoliation of peridermal cells?

    <p>Vernix caseosa</p> Signup and view all the answers

    Which of the following is NOT a layer of the skin?

    <p>Mesoderm</p> Signup and view all the answers

    At what week of embryonic development does the surface ectoderm of the skin form the primordium of the epidermis?

    <p>4 Weeks</p> Signup and view all the answers

    What is the significance of the lateral edges in embryonic development?

    <p>It connects the intraembryonic and extraembryonic cavities</p> Signup and view all the answers

    What is the role of the extraembryonic mesoderm?

    <p>It provides direct communication between the intraembryonic and extraembryonic coelom</p> Signup and view all the answers

    What is the relationship between the intraembryonic and extraembryonic coelom?

    <p>They communicate with each other through the chorion</p> Signup and view all the answers

    What is the significance of the head region in embryonic development?

    <p>It is crucial for the formation of the intraembryonic coelom</p> Signup and view all the answers

    What is formed from the fusion of the intraembryonic and extraembryonic coelom?

    <p>The chorion</p> Signup and view all the answers

    What is the function of the amniotic folds?

    <p>They separate the intraembryonic and extraembryonic coelom</p> Signup and view all the answers

    What is the significance of the cranial region in embryonic development?

    <p>It is crucial for the formation of the intraembryonic coelom</p> Signup and view all the answers

    What is the primary function of the dorsal mesentery?

    <p>To provide a pathway for blood vessels, nerves, and lymphatics to reach the gut tube</p> Signup and view all the answers

    At 5 weeks, what is the attachment site of the umbilical cord?

    <p>The midgut</p> Signup and view all the answers

    What is the relationship between the intraembryonic coelom and the yolk sac?

    <p>The intraembryonic coelom communicates with the yolk sac</p> Signup and view all the answers

    What is the name of the artery that supplies the hindgut?

    <p>Inferior mesenteric artery</p> Signup and view all the answers

    What is the term for the dorsal mesentery when it is associated with the heart?

    <p>Dorsal mesocardium</p> Signup and view all the answers

    What is the purpose of the ventral mesentery?

    <p>To attach the liver to the ventral wall</p> Signup and view all the answers

    Which of the following arteries supplies the foregut?

    <p>Celiac arterial trunk</p> Signup and view all the answers

    At 5 weeks, what is the attachment site of the liver?

    <p>The ventral wall</p> Signup and view all the answers

    Which of the following structures is still part of the embryonic body wall?

    <p>The liver</p> Signup and view all the answers

    What is the result of cranial folding in the embryo?

    <p>The pericardial cavity moves to the ventral side of the foregut.</p> Signup and view all the answers

    What is the purpose of the pericardioperitoneal canals?

    <p>To connect the pericardial and peritoneal cavities.</p> Signup and view all the answers

    What is the location of the gut tube in relation to the pericardial and peritoneal cavities?

    <p>It is between the pericardial and peritoneal cavities.</p> Signup and view all the answers

    What happens to the peritoneum in the embryo?

    <p>It has not demarcated the pericardial cavity.</p> Signup and view all the answers

    What type of fluid movement occurs between the pericardial and peritoneal cavities?

    <p>Convection</p> Signup and view all the answers

    What is the relationship between the pericardial and peritoneal cavities?

    <p>They are connected by canals.</p> Signup and view all the answers

    What is the result of the pleuropericardial folds fusing?

    <p>Isolation of the pericardial cavity</p> Signup and view all the answers

    At what week of development do the pleural cavities expand into the body wall?

    <p>6 weeks</p> Signup and view all the answers

    What happens to the pericardial cavity at 5 weeks of development?

    <p>It becomes continuous with the pericardio-peritoneal canals</p> Signup and view all the answers

    What happens to the somatic mesoderm at 6 weeks of development?

    <p>It is split by the expanding lung</p> Signup and view all the answers

    What is the result of the lung growing and expanding into the body wall?

    <p>The splitting of the somatic mesoderm</p> Signup and view all the answers

    What is the location of the pleuropericardial folds at 7 weeks of development?

    <p>Medially, ventral to the esophagus</p> Signup and view all the answers

    Study Notes

    Development of the Integumentary System

    • The integumentary system consists of skin and its appendages that protect the body.
    • It develops from two germ layers: surface ectoderm and mesoderm.

    Development of the Skin

    • The skin has two layers: epidermis (superficial epithelial tissue) and dermis (deeper layer of connective tissue).
    • Epidermis is derived from surface ectoderm, while dermis is derived from mesoderm.

    Development of the Epidermis

    • At 4 weeks, the surface ectoderm of the skin (primordium of the epidermis) forms as simple cuboidal epithelium.
    • At 7 weeks, the simple cuboidal epithelial cells proliferate and form two layers of squamous epithelium: periderm and basal layer.
    • The periderm undergoes keratinization, desquamation, and eventually exfoliation, forming vernix caseosa by week 20.
    • The basal layer replaces the periderm and forms the "future stratum germinativum".

    Formation of the Pericardial Cavity and Embryonic Cavities

    • The pericardial cavity forms and is connected to the intraembryonic and extraembryonic cavities through the pericardioperitoneal canals.
    • The cranial folding brings the pericardial cavity to the ventral side of the foregut.
    • The dorsal mesentery is the pathway for blood vessels, nerves, and lymphatics to reach the gut tube.
    • The pericardioperitoneal canals fuse to form the fibrous pericardium, isolating the pericardial cavity.
    • The lung grows and the pleural cavities expand into the body wall, splitting the somatic mesoderm.
    • The pleuropericardial folds fuse medially, ventral to the esophagus, and the pleural cavities expand ventrally around the heart.

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    Description

    Learn about the development of the integumentary system, including skin and its appendages that protect the body. Understand the role of surface etoderm and mesoderm.

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