23 Questions
What is the first sign of development of the respiratory system?
Formation of the lower respiratory diverticulum
Which structures are included in the upper respiratory system?
Nose, nasopharynx, oropharynx
When do the nasal placodes deepen considerably to form the nasal sacs?
Week 4
Where does the first sign of respiratory system development occur?
Ventral wall of the primitive foregut
Which structures are included in the lower respiratory system?
Larynx, trachea, bronchi
In which week does the formation of the lower respiratory diverticulum occur?
Week 4
What structures form the superior, middle, and inferior conchae in the nasal cavities?
Swelling in the lateral wall
What forms the thickened patch known as the olfactory epithelium in the roof of each nasal cavity?
Ectoderm of the nasal placode
What contributes to the skeletal elements and connective tissue of the head and neck region?
Neural crest cells
Which nerve supplies sensory branches to the overlying ectoderm, and endoderm of each pharyngeal arch?
Hind brain-derived nerve
What is the first sign of development in the lower respiratory system during week 4?
Formation of laryngotracheal diverticulum
Which structure separates the nasal sacs from the oral cavity before rupturing to create continuity with the oral cavity?
Oronasal membrane
What forms a cartilaginous skeletal element in each pharyngeal arch?
Mesodermal core
During which week does the formation of the lower respiratory diverticulum occur?
Week 4
What is the initial structure formed by the first sign of development in the lower respiratory system?
Lower respiratory diverticulum
What structures are included in the upper respiratory system?
Nose, nasopharynx, and oropharynx
What is the initial development that occurs in the nasal cavities?
Formation of nasal placodes
Which of the following structures separates the nasal sacs from the oral cavity before rupturing to create continuity with the oral cavity?
Oronasal membrane
What forms the superior, middle, and inferior conchae in the nasal cavities?
Swellings in the lateral wall of each nasal cavity
What contributes to the skeletal elements and connective tissue of the head and neck region?
Neural crest cells
What is the first sign of development in the lower respiratory system during week 4?
Formation of laryngotracheal diverticulum
What separates the nasal sacs from the oral cavity before rupturing to create continuity with the oral cavity?
Oronasal membrane
What forms a cartilaginous skeletal element in each pharyngeal arch?
Mesoderm of the arches
Study Notes
Development of Respiratory System
- The first sign of development of the respiratory system occurs in the fourth week of embryonic development.
- This development occurs in the ventral wall of the foregut, where the respiratory diverticulum forms.
Upper Respiratory System
- The upper respiratory system includes the nasal cavities, paranasal sinuses, and nasopharynx.
Lower Respiratory System
- The lower respiratory system includes the larynx, trachea, bronchi, and lungs.
- The formation of the lower respiratory diverticulum occurs during the fourth week of embryonic development.
Nasal Cavities
- The nasal placodes deepen considerably to form the nasal sacs during the fifth week of embryonic development.
- The olfactory epithelium, a thickened patch, forms in the roof of each nasal cavity.
- The superior, middle, and inferior conchae in the nasal cavities are formed by the cartilaginous skeletal elements.
Pharyngeal Arches
- The neural crest cells contribute to the skeletal elements and connective tissue of the head and neck region.
- The nerve that supplies sensory branches to the overlying ectoderm and endoderm of each pharyngeal arch is the trigeminal nerve.
- A cartilaginous skeletal element forms in each pharyngeal arch.
Test your knowledge of the development of the respiratory system with this quiz based on the lecture by Marwa. M. Hassan, a lecturer of anatomy from Helwan University. The quiz covers the development of the nose, pharyngeal arches, larynx, trachea, and bronchi from Langman's Medical Embryology and BRS Embryology.
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