What does the intermediate mesoderm form?
What does the intermediate mesoderm form?
The intermediate mesoderm generates the urogenital system—the kidneys, the gonads, and their respective duct systems. Saving the gonads for our discussion of sex determination in Chapter 17, we will concentrate here on the development of the mammalian kidney.
What does the dorsal aorta give rise to?
The dorsal aortae give off seven cervical intersegmental arteries bilaterally. The upper six contribute to the development of the vertebral, superior intercostal, and deep cervical arteries. The seventh intersegmental arteries contribute to the formation of the subclavian arteries bilaterally.
What does paraxial mesoderm give rise to?
The paraxial mesoderm gives rise to the axial skeleton. The lateral plate mesoderm gives rise to the appendicular skeleton.
What is the paraxial mesoderm?
Paraxial mesoderm, also known as presomitic or somitic mesoderm is the area of mesoderm in the neurulating embryo that flanks and forms simultaneously with the neural tube.
What becomes of the intermediate mesoderm?
The intermediate mesoderm develops into the urogenital system, which includes the kidneys and gonads, and their respective duct systems, as well as the adrenal cortex. The intermediate mesoderm forms paired elevations called urogenital ridges.
What is the function of intermediate mesoderm?
The intermediate mesoderm develops into vital parts of the urogenital system (kidneys, gonads and respective tracts), as well as the reproductive system.
How is the dorsal aorta formed?
The dorsal aorta forms from the direct aggregation of endothelial precursor cells derived from the lateral plate mesoderm. These cells form a vessel directly by a vasculogenesis mechanism.
Where does the dorsal aorta receive blood from?
Rostrally the dorsal aorta branches into the internal carotid arteries that supply oxygenated blood the head.
Where does paraxial mesoderm come from?
The paraxial mesoderm arises from the primitive streak. The first noncompartmentalized epithelial somite undergoes several morphological changes and differentiates into a ventral mesenchymal part consisting of the sclerotome and a dorsal epithelial compartment, the dermomyotome.
How paraxial mesoderm is formed?
Paraxial mesoderm is formed bilaterally adjacent to the neural tube in the mouse embryo and becomes progressively segmented along the rostral-to-caudal axis to generate the somites.
What do you mean by paraxial rays?
A paraxial ray is a ray which makes a small angle (θ) to the optical axis of the system, and lies close to the axis throughout the system.
Where is the intermediate mesoderm?
kidney
The intermediate mesoderm is located between the lateral mesoderm and the paraxial mesoderm. It develops into the kidney and gonads.
How are the cells of the dorsal aorta formed?
The dorsal aorta forms from the direct aggregation of endothelial precursor cells derived from the lateral plate mesoderm. These cells form a vessel directly by a vasculogenesis mechanism.
Where are the segmental arteries located in the dorsal aorta?
A pair of segmental arteries arise from the dorsal aorta shortly after the union of the lateral aortas and anterior to the anastomosis of the epibranchial arteries with the dorsal aorta (not shown in Figure 1 ).
Where does the paraxial and intermediate mesoderm form?
1. You should understand that the mesoderm forms all of the organs between the ectodermal wall and the endodermal tissues. 2. You should understand that the paraxial mesoderm forms structures at the back of the embryo surrounding the spinal cord, including the somites and their derivative cartilage, bone, muscle and dermis. 3.
Which is part of the aorta supplies the limbs?
The two dorsal aortae unite posterior to the heart (Plate 90) to form a single median vessel which gives rise to: The arteries supplying the limbs. The segmental (intersegmental) arteries (Text-Figure 40; Plates 43, 155Plate 43Plate 155), which are branches of the dorsal aorta and extend out between the somites.
