Embryology

Vitelline duct: closure time

VItelline duct normally closes around week VI of intrauterine life.

Potter syndrome: features

POTTER

  • Pulmonary hypoplasia
  • Oligohydrominios
  • Twisted skin (wrinkly skin)
  • Twisted face (Potter facies)
  • Extremities defects
  • Renal agenesis (bilateral)

 

Placenta-crossing substances

WANT My Hot Dog”

  • Wastes
  • Antibodies
  • Nutrients
  • Teratogens
  • Microorganisms
  • Hormones/ HIV
  • Drugs

 

Cranial and spinal neural crest: major derivatives

GAMES

  • Glial cells (of peripheral ganglia)
  • Arachnoid (and pia)
  • Melanocytes
  • Enteric ganglia
  • Schwann cells

 

Mesoderm components

MESODERM

  • Mesothelium (peritoneal, pleural, pericardial)/ Muscle (striated, smooth, cardiac)
  • Embryologic Spleen/ Soft tissue/ Serous linings/ Sarcoma/ Somite
  • Osseous tissue/ Outer layer of suprarenal gland (cortex)/ Ovaries
  • Dura/ Ducts of genitalia
  • Endothelium
  • Renal Microglia
  • Mesenchyme/ Male gonad

 

Vasculogenesis vs. angiogenesis

“Vascu is new. Angi is pre“: Vasculogenesis is new vessels developing in situ from existing mesenchyme. Angiogenesis is vessels develop from sprouting off pre-existing arteries.

Weeks 2, 3, 4 of development: an event for each

  • Week Two: Bilaminar germ disc.
  • Week Three: Trilaminar germ disc.
  • Week Four: Four limbs appear.

 

Teratogenesis: when it occurs

TEratogenesis is most likely during organogenesis–between the: Third and  Eighth weeks of gestation.

 

Tetrology of Fallot

“Don’t DROP the baby”

  • Defect (VSD)
  • Right ventricular hypertrophy
  • Overriding aorta
  • Pulmonary stenosis

 

Lung development phases

Every Premature Child Takes Air”

  • Embryonic period
  • Pseudoglandular period
  • Canalicular peroid
  • Terminal sac period
  • Alveolar period

Branchial arch giving rise to aorta

Aor– from Four“: Aorta is from fourth arch.

 

Neuroectoderm derivatives

Neuroectoderm gives rise to:

  • Neurons
  • Neuroglia
  • Neurohypophysis
  • piNeurol (pineal) gland

 

Tetrology of Fallot

IHOP-International House of Pancakes”:

  • Interventricular septal defect
  • Hypotrophy of right ventricle
  • Overriding aorta
  • Pulmonary stenosis

 

Woffian duct (mesonephric duct) derivatives

Gardener’s SEED:

Female: Gartner’s duct, cyst

Male:

  • Seminal vesicles
  • Epididymis
  • Ejaculatory duct
  • Ductus deferens

 

Foregut derivatives

Little Embryo People Do Like Swallowing, Producing Gas”: Lungs Esophagus Pancreas Duodenum (proximal) Liver Stomach Pancreas Gall bladder

 

 You can suggest more mnemonics …

Warm regards,

Dr. Indrajit Rana

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