Embryology Quiz: Mesoderm Development

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Questions and Answers

What component is formed from the sclerotome of each somite?

Dermis of the back

Tendon, cartilage, and bone (correct)

Nerve fibers

Muscle tissue

Which process allows the lateral plate mesoderm to contribute to the dermis and skeletal structure?

Transdifferentiation

Lateral body wall folding (correct)

Cephalocaudal folding

Neurulation

Which part of the embryo does the visceral layer of lateral plate mesoderm contribute to?

Forming dermal layers

Skeletal muscle formation

Wall of the gut tube (correct)

Formation of the diaphragm

What is the primary derivative of the endodermal germ layer in the embryo?

Gastrointestinal tract Signup and view all the answers

Which layer of the lateral plate mesoderm is involved in forming the ventral body wall?

Somatic or parietal layer Signup and view all the answers

What is the main function of the intermediate mesoderm during embryonic development?

Differentiates into urogenital structures Signup and view all the answers

At what developmental stage do somites begin to form segmented structures from somitomeres?

Beginning of the third week Signup and view all the answers

How many pairs of somites are typically present by the end of the fifth week of development?

42 to 44 pairs Signup and view all the answers

Which of the following is NOT a division of the somite?

Endoderm Signup and view all the answers

What event marks the appearance of the first pair of somites in the embryo?

20th day of development Signup and view all the answers

What is the primary role of the myotome in somite development?

To provide segmental innervation to the laterally developed muscles Signup and view all the answers

Which statement is true regarding the layers of the lateral plate mesoderm?

The parietal layer forms the dermis of the limbs and the bones of the skeletal system Signup and view all the answers

What differentiates the gut tube into foregut, midgut, and hindgut?

Cephalocaudal folding of the endodermal germ layer Signup and view all the answers

Which component of somites primarily contributes to the skeletal structure?

Sclerotome Signup and view all the answers

What is an accurate description of the role of the visceral layer of the lateral plate mesoderm?

It surrounds the organs and helps in gut tube formation Signup and view all the answers

How does each myotome and dermatome maintain its identification throughout development?

By retaining its innervation from its original segment, regardless of cellular migration Signup and view all the answers

What effect does the lateral plate mesoderm have on the embryo?

It contributes to the formation of pericardial, pleural, and peritoneal cavities Signup and view all the answers

What role does the paraxial mesoderm play during embryonic development?

Development of the vertebral column Signup and view all the answers

Which of the following accurately describes the connection between the different mesoderm layers?

Intermediate mesoderm temporarily connects paraxial and lateral plate mesoderm. Signup and view all the answers

What are the primary components derived from somites?

Vertebrae, dermis, and striated muscles Signup and view all the answers

Which structure is primarily responsible for the development of urogenital structures?

Intermediate mesoderm Signup and view all the answers

How is the overall age of an embryo estimated during the early stages of development?

By counting the number of somites present Signup and view all the answers

What is the main function of the myotome component of a somite?

To form striated skeletal muscles Signup and view all the answers

Which pair of structures is derived from the lateral plate mesoderm?

Heart and parietal pleura Signup and view all the answers

What describes the differentiation of somite into its three parts?

The differentiation is a sequential process that forms distinct functional structures Signup and view all the answers

Study Notes

Mesoderm Germ Layer Derivatives

Paraxial Mesoderm: Forms along the midline and differentiates into segmented structures called somites.
Intermediate Mesoderm: Connects paraxial and lateral plate mesoderm, forming the urogenital structures.
Lateral Plate Mesoderm: Divides into two layers:
- Somatic Mesoderm: Forms dermis of the body wall, limb bones, and connective tissue.
- Splanchnic Mesoderm: Forms the gut tube wall and serous membranes surrounding organs.

Somite Differentiation

Sclerotome: Migrates around the neural tube to form the vertebral column and ribs.
Dermatome: Forms the dermis of the skin.
Myotome: Forms striated muscles, including body wall and limb muscles.

Endoderm Germ Layer Derivatives

Gastrointestinal Tract: Formed from the endoderm, which covers the ventral surface of the embryo and forms the roof of the yolk sac.
- Foregut: Develops into the pharynx, esophagus, stomach, and duodenum.
- Midgut: Develops into the small intestine, cecum, and appendix.
- Hindgut: Develops into the large intestine, rectum, and anal canal.

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Description

Test your knowledge on the mesoderm development in embryology. This quiz covers key concepts including the contributions of the sclerotome, lateral plate mesoderm, and endodermal germ layer. Perfect for students studying developmental biology or embryology.