10 - Renal Embryology Flashcards
This is located in the trunk and is immediately lateral to each somite. It segments into cylindrical structures.
Intermediate Mesoderm
This is what produces the urinary system and parts of the genital system. The urinary system develops first.
Intermediate Mesoderm
This is a longitudinal band of mesoderm that forms on each side of the dorsal aorta.
Urogenital Ridge
A portion of the urogenital ridge will form the…
Nephrogenic Cord
The Nephrogenic Cord gives rise to what nephric structures?
Pronephros
Mesonephros
Metanephros
What are the functions of the three nephric structures?
Proenphros = Rudimentary
Mesoenphros = Functions briefly during early fetal period
Metanephros = Permanent kidneys
Briefly explain the steps from the Urogenital Ridge to reach the permanent kidneys.
Urogenital Ridge --- Nephrogenic Cord --- Pronephros --- Mesonephros --- Metanephros (Permanent Kidneys)
These are bilateral, transitory structures that appear early in the 4th week. Located in cervical region.
Proenphros
Pronephric ducts run caudally and open into the ________.
Cloaca
The pronephros degenerate by ________ days, but the pronephric ducts persist and are used by _________.
24-25
Mesonephros
Pronephros are important because they initiate the cascade leading to formation of the definitive ________.
Kidney
These are bilateral, transient structures that appear late in the 4th week. They are caudal to pronephros.
Mesonephros
The Mesonephros includes the _________ _________ and _________ _________.
Mesonephric Ducts
Mesonephric Tubules
The Mesonephric Ducts develop first and induce the Mesonephric Tubules to form from surrounding…
Intermediate Mesoderm
Mesonephric Tubules will from ________ ________.
Renal Corpuscles
For the Mesonephric Tubules, the medial end of them is a cup-shaped ________ ________ that wraps around a ________ (knot of capillaries).
Glomerular Capsule
Glomerulus
These function as interim kidneys from 6-10 weeks, producing small amounts of urine.
Mesonephric Tubules
After 10 weeks, the Mesonephric Tubules stop functioning. They will regress in females and form ________ _______ in males. These degenerate by _______ weeks.
Efferent Ductules
12
This arises during the 5th week and is the caudal end of each Mesonephric Duct. It induces the Ureteric Bud.
Metanephros
What does the Metanephros form?
Ureteric Bud (Collecting Portion) = outgrowth of Mesonephric Duct
Metanephric Blastema (Excretory Portion) = from Nephrogenic Cord
The Metanephros forms the functional and definitive ________ by the 9th-10th week.
Kidney
Definitive kidneys have what two portions?
Excretory Portion
Collecting Portion