Somite patterns

The video tutorial provides an in-depth look at the development of a 31-day-old embryo, focusing on the somites and their role in forming various structures. It explains the segmentation of somites into cervical, thoracic, lumbar, and sacral regions, and their transformation into dermatomes, myotomes, and sclerotomes. The tutorial details the innervation of dermatomes by spinal nerves, the formation of muscles from myotomes, and the development of vertebrae from sclerotomes. It emphasizes the repetitive pattern of these structures across different segmental levels.

What is the primary focus of the 31-day-old embryo in the lateral view?

• The development of the heart

• The growth of the brain

• The formation of the limbs

• The visibility of somites

In the cross-section of a somite, what will the neural tube eventually become?

• The spinal cord

• The liver

• The heart

• The brain

What is the role of dermatomal cells in embryonic development?

• They form the muscles of the limbs

• They develop into the neural tube

• They create the vertebrae

• They become the dermis of the back

How is the skin innervated according to the clinical definition of a dermatome?

• By multiple spinal nerve levels

• By the heart

• By a single spinal nerve level

• By the brain directly

What do the epaxial muscles develop into?

• The muscles of the limbs

• The facial muscles

• The erector spinae muscles

• The heart muscles

Which cells form the hypaxial muscles?

• Sclerotome cells

• Dermatomal cells

• Neural crest cells

• Hypomere cells

What is the function of the sclerotome in embryonic development?

• To form the skin of the back

• To develop into the spinal cord

• To create vertebrae and protect the spinal cord

• To become the muscles of the limbs