What does the Dermomyotome form?

The central region of the dorsal layer of the dermamyotome is called the dermatome, and it generates the mesenchymal connective tissue of the back skin: the dermis. (The dermis of other areas of the body forms from other mesenchymal cells, not from the somites.)

Where does the Dermomyotome come from?

It is formed when a dermamyotome (the remaining part of the somite left when the sclerotome migrates), splits to form the dermatome and the myotome. The dermatomes contribute to the skin, fat and connective tissue of the neck and of the trunk, though most of the skin is derived from lateral plate mesoderm.

What is derived from the paraxial mesoderm?

The paraxial mesoderm gives rise to the axial skeleton. The lateral plate mesoderm gives rise to the appendicular skeleton.

What tissues are derived from somitogenesis?

Somitogenesis is the process by which somites form. Somites are bilaterally paired blocks of paraxial mesoderm that form along the anterior-posterior axis of the developing embryo in segmented animals. In vertebrates, somites give rise to skeletal muscle, cartilage, tendons, endothelium, and dermis.

What are the structure of somites?

Somites are segmental axial structures of vertebrate embryos that give rise to vertebral column, ribs, skeletal muscles, and subcutaneous tissues. A bilateral pair of somites forms periodically at the anterior ends of the presomitic mesoderm (PSM), located at the caudal part of embryos (Fig.

How many somites are there?

In the chick embryo, a pair of somite forms every 90 min at 37 °C and a total of 52 somites pairs are formed during the somitogenesis process which lasts from day 1 to day 5 of development. Somitogenesis can be subdivided into three major phases.

Where is paraxial mesoderm found?

The presomitic paraxial mesoderm is located adjacent to the notochord and neural tube and constitutes a longitudinal column of cells on either side of the notochord.

What is Prechordal mesoderm?

In the development of vertebrate animals, the prechordal plate is a “uniquely thickened portion” of the endoderm that is in contact with ectoderm immediately rostral to the cephalic tip of the notochord. It is the most likely origin of the rostral cranial mesoderm.

What does archenteron mean?

Medical Definition of archenteron : the cavity of the gastrula of an embryo forming a primitive gut. — called also gastrocoel.