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Development of the tissues and organs

On the 4-th week The germ disc becomes like a convex structure. The endodermic layer transforms into the primitive gut, which is communicates with the yolk sac by viteline duct

Histogenesis:

The mesodermal cells form somites on both sides of notochord. There are 43-44 pairs of somites.

The dorsal part of somites is divided into 3 groups of cells:

-medial part forms sclerotome (1)

-middle part forms myotom (2)

-lateral part forms dermatome (3)

The ventral part of somites forms:

-splanchnopleura (4)

-somatopleura (5)

-coelomic cavity between them (6)

The skeleton, it’s function and parts. Bone as an organ. Classification of bones, their structure. The development of bones during an ontogenesis. The role of labour, sport, social and biological factors in the structure of bones. Types of the ostegenesis. X ray anatomy of bones. Places of the palpation of prominent parts of the skeleton, having the practical importance, in the living.

Science which studies bones- osteology. Bones form skeleton of the body. The skeleton is the complex of compact structures, which are developed from the mesenchyme.

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