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Questions and Answers
Which layer of the skin is derived from surface ectoderm?
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?
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?
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?
What is the name of the layer that replaces the periderm and forms the future stratum germinativum?
What are the two layers of squamous epithelium formed at 7 weeks of embryonic development?
What are the two layers of squamous epithelium formed at 7 weeks of embryonic development?
What is the name of the substance formed by the complete exfoliation of peridermal cells?
What is the name of the substance formed by the complete exfoliation of peridermal cells?
Which of the following is NOT a layer of the skin?
Which of the following is NOT a layer of the skin?
At what week of embryonic development does the surface ectoderm of the skin form the primordium of the epidermis?
At what week of embryonic development does the surface ectoderm of the skin form the primordium of the epidermis?
What is the significance of the lateral edges in embryonic development?
What is the significance of the lateral edges in embryonic development?
What is the role of the extraembryonic mesoderm?
What is the role of the extraembryonic mesoderm?
What is the relationship between the intraembryonic and extraembryonic coelom?
What is the relationship between the intraembryonic and extraembryonic coelom?
What is the significance of the head region in embryonic development?
What is the significance of the head region in embryonic development?
What is formed from the fusion of the intraembryonic and extraembryonic coelom?
What is formed from the fusion of the intraembryonic and extraembryonic coelom?
What is the function of the amniotic folds?
What is the function of the amniotic folds?
What is the significance of the cranial region in embryonic development?
What is the significance of the cranial region in embryonic development?
What is the primary function of the dorsal mesentery?
What is the primary function of the dorsal mesentery?
At 5 weeks, what is the attachment site of the umbilical cord?
At 5 weeks, what is the attachment site of the umbilical cord?
What is the relationship between the intraembryonic coelom and the yolk sac?
What is the relationship between the intraembryonic coelom and the yolk sac?
What is the name of the artery that supplies the hindgut?
What is the name of the artery that supplies the hindgut?
What is the term for the dorsal mesentery when it is associated with the heart?
What is the term for the dorsal mesentery when it is associated with the heart?
What is the purpose of the ventral mesentery?
What is the purpose of the ventral mesentery?
Which of the following arteries supplies the foregut?
Which of the following arteries supplies the foregut?
At 5 weeks, what is the attachment site of the liver?
At 5 weeks, what is the attachment site of the liver?
Which of the following structures is still part of the embryonic body wall?
Which of the following structures is still part of the embryonic body wall?
What is the result of cranial folding in the embryo?
What is the result of cranial folding in the embryo?
What is the purpose of the pericardioperitoneal canals?
What is the purpose of the pericardioperitoneal canals?
What is the location of the gut tube in relation to the pericardial and peritoneal cavities?
What is the location of the gut tube in relation to the pericardial and peritoneal cavities?
What happens to the peritoneum in the embryo?
What happens to the peritoneum in the embryo?
What type of fluid movement occurs between the pericardial and peritoneal cavities?
What type of fluid movement occurs between the pericardial and peritoneal cavities?
What is the relationship between the pericardial and peritoneal cavities?
What is the relationship between the pericardial and peritoneal cavities?
What is the result of the pleuropericardial folds fusing?
What is the result of the pleuropericardial folds fusing?
At what week of development do the pleural cavities expand into the body wall?
At what week of development do the pleural cavities expand into the body wall?
What happens to the pericardial cavity at 5 weeks of development?
What happens to the pericardial cavity at 5 weeks of development?
What happens to the somatic mesoderm at 6 weeks of development?
What happens to the somatic mesoderm at 6 weeks of development?
What is the result of the lung growing and expanding into the body wall?
What is the result of the lung growing and expanding into the body wall?
What is the location of the pleuropericardial folds at 7 weeks of development?
What is the location of the pleuropericardial folds at 7 weeks of development?
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.
