Wolffian ducts

Examples of Wolffian ducts in the following topics:

• Embryological and Fetal Events

  • The reproductive organs are developed from the Wolffian ducts in males and the Mullerian ducts in females.
  • These embryonic structures are the Wolffian and Müllerian ducts, also known as mesonephric and paramesonephric ducts, respectively.
  • The Wolffian duct remains as the duct in males, and the Müllerian as that of the female.
  • In the female the Wolffian bodies and ducts atrophy.
  • Shortly after the formation of the Wolffian ducts a second pair of ducts is developed; these are the Müllerian ducts.

• Development of the Urinary System

  • The mesonephros is functional for only a short period of time and remains as the mesonephric (Wolffian) duct.
  • It develops from the uteric bud, an outgrowth of the mesonephric duct, and the metanephric mesoderm, derived from the caudal part of the nephrogenic ridge.
  • The lower ends of the metanephric ducts are incorporated into the wall of the urogenital sinus and form the trigone of the bladder.

• Lymph Trunks and Ducts

  • Lymphatic trunks then drain lymph fluid into the lymph ducts, the final part of the lymphatic system.
  • Two lymph ducts receive lymph from the lymph trunks.
  • The thoracic duct drains into to the left subclavian vein while the right duct drains into the right subclavian vein, both at the junction between the respective vein and the jugular vein.
  • The lymph ducts each have internal valves at their junction with the subclavian vein.
  • These function similarly to other lymphatic valves and prevent venous blood from flowing into the lymph duct.

• Associated Organs

  • These eventually drain into the right and left hepatic ducts, which in turn merge to form the common hepatic duct.
  • The cystic duct, from the gallbladder, joins with the common hepatic duct to form the common bile duct.
  • The common bile duct and the pancreatic duct enter the duodenum together.
  • The gallbladder is connected to the main bile duct through the cystic duct, which in turn connects to the duodenum.
  • The liver and gallbladder are connected via the cystic duct, the liver and pancreas are connected via the pancreatic duct, and all three enter the duodenum at the common bile duct,

• Testes Ducts

  • Testes ducts, which include the seminiferous tubules and vas deferens, are involved in the creation or transportation of sperm.
  • The efferent ducts connect the rete testis with the initial section of the epididymis.
  • In humans and other large mammals, there are approximately 15-20 efferent ducts which occupy nearly one-third of the head of the epididymis.
  • Two ducts connect the left and right epididymis to the ejaculatory ducts in order to move sperm.
  • A modern procedure that does not include cutting the ducts involves injecting an obstructive material into the ductus to block the flow of sperm.

• Mammary Glands

  • These alveoli join to form groups known as lobules, and each lobule has a lactiferous duct that drains into openings in the nipple.
  • They exist in both sexes during the embryonic stage, forming only a rudimentary duct tree at birth.
  • A mature duct tree reaching the limit of the fat pad of the mammary gland is formed by bifurcation of duct terminal end buds, secondary branches sprouting from primary ducts and proper duct lumen formation.
  • However, a functional lactiferous duct tree can be reformed when a female is pregnant again.
  • Milk duct 7.

• Pancreatic Juice

  • Pancreatic secretion consists of an aqueous bicarbonate component from the duct cells and an enzymatic component from the acinar cells.
  • A variety of factors cause a high pressure within pancreatic ducts.
  • Pancreatic duct rupture and pancreatic juice leakage cause pancreatic self-digestion.
  • A schematic diagram that shows pancreatic acini and the ducts where fluid is created and released.

• Anatomy of the Gallbladder

  • The neck tapers and connects to the biliary tree via the cystic duct, which then joins the common hepatic duct to become the common bile duct.
  • The muscularis is a layer of smooth muscular tissue that helps the gallbladder contract and squirt its bile into the bile duct.

• Nephron: The Functional Unit of the Kidney

  • This last part of the nephron connects with and empties its filtrate into collecting ducts that line the medullary pyramids.
  • The collecting ducts amass contents from multiple nephrons, fusing together as they enter the papillae of the renal medulla.
  • As urine travels down the collecting duct system, it passes by the medullary interstitium, which has a high sodium concentration as a result of the loop of Henle's countercurrent multiplier system.
  • Urine leaves the medullary collecting ducts through the renal papillae, emptying into the renal calyces, the renal pelvis, and finally into the bladder via the ureter.
  • The glomerulus and convoluted tubules of the nephron are located in the cortex of the kidney, while the collecting ducts are located in the pyramids of the kidney's medulla.

• Development of Hearing and Balance

  • The utricular division of the auditory vesicle also responds to angular acceleration, as do the endolymphatic sac and duct that connect the saccule and utricle.
  • The vestibular wall will separate the cochlear duct from the perilymphatic scala vestibuli, a cavity inside the cochlea.
  • The basilar membrane separates the cochlear duct from the scala tympani, a cavity within the cochlear labyrinth.
  • The lateral wall of the cochlear duct is formed by the spiral ligament and the stria vascularis, which produces the endolymph.
  • The hair cells develop from the lateral and medial ridges of the cochlear duct, which together with the tectorial membrane make up the organ of Corti.