Human Development Mesoderm Lect 5

Front 1

Somitomere

Back 1

Metameric pattern in the preaxial mesoderm that precedes the development of a somite.
In the head region 7 somitomeres are formed, which do not go on to form somites.

Front 2

Somitogenesis

Back 2

The development of a somite.

Front 3

Somite

Back 3

Mesodermal segments, formed in pairs in the early embryonic paraxial mesoderm, along the
length of the trunk.

Front 4

Sclerotome

Back 4

A group of mesenchymal cells that emerge from the ventromedial part of a somite. These
cells migrate toward the notochord where they form the vertebrae.

Front 5

Rostral

Back 5

Toward the snout end of the organism.

Front 6

Prechordal

Back 6

Located rostral to the notochord.

Front 7

Mesoderm

Back 7

The middle of the 3 germ layers. It gives rise to all connective tissues (except in the head
and neck regions), all body musculature, blood, cardiovascular and lymphatic systems, most of the
urogenital system and the lining of pericardial, pleural and peritoneal cavities.

Front 8

Mesenchyme

Back 8

A primordial embryonic connective tissue, consisting of stellate cells and a loose, fluid
extracellular matrix. Can originate from the mesoderm or from neural crest.

Front 9

Epimere

Back 9

Segment of myotome that is dorsal to the body axis.

Front 10

Axial

Back 10

Medial/midline: site of the prechordal plate and notochord.

Front 11

Caudal

Back 11

Toward the tail end of the organism.

Front 12

Cephalic

Back 12

Relating to the head or toward the head.