Later Differentiation Of Mesoderm And Endoderm

Front 1

Skeletal Muscle Origination

Back 1

Arises from the myotome compartment of somites
Myoblasts migrate to the site of muscle formation. Single myoblast cells fuse into multinucleate myotubes. Myofibers containing contractile proteins then assemble.

Muscle of the face arises from cranial somitomeres

Front 2

Smooth Muscle Origination

Back 2

Cells do not fuse; remain Mononucleate
a. Smooth muscle of the visceral organs is derived from
the splanchnic mesoderm layer.
b. For most blood vessels, smooth muscle comes from the somatic mesoderm.
c. Smooth muscle of the iris, sweat glands and mammary glands comes from the ectoderm.
d. For the ascending aorta and carotid vessels, smooth
muscle is derived from migrating neural crest cells.

Front 3

Cardiac Muscle origination

Back 3

Arise from the splanchnic mesoderm in the cardiogenic region. This is sometimes called the cardiac crescent.

Front 4

Formation of Heart

Back 4

Front 5

Vasculogenesis

Back 5

Only occurs in mesodermal tissue
Only forms the major blood vessels

Front 6

Angiogenesis

Back 6

Blood vessel formation by branching from the primary blood vessels.
(Think VEGF)

Front 7

Liver formation

Back 7

Dependent on the heart for signals to induce formation

Front 8

Lateral Folding of embryo

Back 8

Front 9

Sagittal folding of embryo

Back 9

Front 10

Meckel's Diverticulum

Back 10

A bulge or pouch off the small intestine. Remnants of the yolk sac stalk.
Present in 1 in every 50 people.
Most people show no symptoms, although intestinal blockage or bleeding may sometimes result.