Embryology Flashcards by wajiha siddiqi

derivatives for foregut

esophagus
stomach
liver
gallbladder
proximal duodenum

How well did you know this?

Not at all

Perfectly

artery of foregut

celiac trunk

How well did you know this?

Not at all

Perfectly

derivatives of midgut

dustal duodenum
jejenum
ileum
cecum\appendix
ascending colon
proximal transverse colon

How well did you know this?

Not at all

Perfectly

artery of mid gut

Superior mesentric

How well did you know this?

Not at all

Perfectly

Derivatives of hindgut

distal transverse colon
descending colon
sigmoid colon
rectum
proximal anus

How well did you know this?

Not at all

Perfectly

arery of hindgut

Inferior mesentric

How well did you know this?

Not at all

Perfectly

Spleen develops from

mesoderm

How well did you know this?

Not at all

Perfectly

Lung bud appears at

4th week

How well did you know this?

Not at all

Perfectly

esophagus reaches its final length in

7th week

How well did you know this?

Not at all

Perfectly

Epthelium and glands of esophagus develop from

Endoderm

How well did you know this?

Not at all

Perfectly

Recanalization of esophagus occurs by

8th week

How well did you know this?

Not at all

Perfectly

Striated muscle of esophagus is derived from

Mesenchyme of pharyngeal arches

How well did you know this?

Not at all

Perfectly

Smooth muscle of esophagus is dervied from

Splanchnic mesenchyme

How well did you know this?

Not at all

Perfectly

Esophageal atersia occurs from

Deviation of the tracheoesophageal spetum posteriorly or from failure of recanalization
results in polyhyrdoamnios

How well did you know this?

Not at all

Perfectly

Esophageal stenosis occurs in the

distal 3rd due incomplete recanalization or failkure of blood vessels to develop

How well did you know this?

Not at all

Perfectly

Congintal hiatal hernia is due to

short esophagus, leadsa to stomach herniating into thorax

How well did you know this?

Not at all

Perfectly

Slight dilation of stomach occurs in

middle 4th week

How well did you know this?

Not at all

Perfectly

Which border of stomach develops faster

Doral border -greater curvature

How well did you know this?

Not at all

Perfectly

Rotation of stomach

90 degrees clockwise longt axis

How well did you know this?

Not at all

Perfectly

Omental bursa if formed by

Dorsal mesogastrium

How well did you know this?

Not at all

Perfectly

Hypertrophic pyloric stenosis

Marked muscular thickening of the pylorus (mostly circular muscle)
leads to projectile vomiting

How well did you know this?

Not at all

Perfectly

Duodenum develops in

4th week

How well did you know this?

Not at all

Perfectly

Lumen of duodenum is obliteraed in

5th and 6th weeks

How well did you know this?

Not at all

Perfectly

Duodenal stenosis involves

horizontal (3rd)
ascending (4th) parts
bile containing vomit happens

How well did you know this?

Not at all

Perfectly

Duodenal atrersia occurs at

hepatopancreatic ampulla | AR inheritience

Double bubble

Duodenal atresia

Liver and bilary organs develope in

4th week

Mass of splanchnic mesoderm between developing heart and midgut

Spetum transversum

Cranial part of hepatic diverticulum forms

Liver

Hpeatic cords and epithelial linig of bilary apparatus develops from

endoderm

Hempatopoeituc tissue and kuppferr cells derived from

septum trasversum

Liver enlarges during

5th-10th week

Hematopoesis in liver begins in

6th week

Liver forms 10% weight of fetus in

9th week

Bile formation begins in

12th week

Caudal part of hepatic diverticulat forms

gallbladder

stalk od diverticulum forms

cystic duct

Bile duct is formed from

Stalk connecting hepatic and cystic ducts to the duodenum

Ventral mesentry forms

lesser omentum falciform ligament visceral peritoneum of liver

Most common form of extrahepatic bilary atersia is

Obliteration of bile ducts at or superior to prota hepatis | Jaundice occurs with clay coloured stools

Dorsal pancreatic bud forms

Part of head neck body

Ventral pancreatic duct forms

Uncinate process | inferior part of head

Main pancreatic duct is formed by

fusion of DISTAL doral duct and ventral duct

assecory pancreatic duct is formed by

proximal part of dorsal duct

Parenchyma of pancreas develops from

endoderm of pancreatic buds which form network of tubules

Pancreatic acini develop from

cell clusters around the dns of primordial pancreatic ducts

Pancreatic islets develop from

groups of cells that seperate tubules

Insulin secretion begins in

10th weeks

Glucagon is released at

15th weeks

connective tissue and speta of pancreas develop from

splanchnic mesenchyme

Annular pancreas

due to growth of bifid ventral pancreatic bud

Spleen is derived from

Mass of mesenchymal cells between layers od dorsal mesogastrium

Spleen begins to develop in

5th week

spleen acquires its shape in

fetal period

Notches in the superior border of spleen are remnants of

Grooves seperating fetal lobules

Capsule, CT amd parencyma of spleen are derived from

mesenchymal cells of splenic primordium

Hematopeosis in spleen occurs in

8th week-birth

Accesory spleens occur where

Hilum iof spleen tail of pancreas gastrosplenic ligament

Physiological umblical herniation occuers in

6th week

Lopp communicates with the yolk stalk until

10th week

Roation od mid gut in umblical cord

90 degrees counter clockwise around axis of superior mesentric

Intestines return to abdomen in

10th week

Large intestine rotation while returning

180 degrees counterclockwise

Cecal bud appears in

6th week

Omphalocele

non return of midcut in the abdomen | causes pulmonary and thoracic hypoplasia

Omphalocele is covered by

epithelium of umblical cord

Umblical hernia

greater omentum and part of small intestine herniate through an imperfectly closed umblicus normal until 3-2 years

Umblical hernia is covered by

Subcutaneous tissue and skin

Gastroschisis

Extrusion of viscera without involving the umblical cord due to split in ant abdomimal wall into the amniotic cavity

Nonrotation of midgut

Cecum lies below pylorus and causes duodenal obstruction

Midgut volvulis

Twisting of the the midgut due to improperly positioned intestines may cause obstruction of superior mesentric artery leading to infarction and gagrene of intestine present with bile vomit

Reversaed rotation

Midgut rotates clockwise duodenum lies anterior to superior mesentric instead of transverse colon small intestine lies on the left

Subhepatic cecum and appendix

Cecum adheres tominferior surface of liver when it returns to the abdomen causes problems while appendicitis

Mobile Cecum

May herniate into the right inguinal canal Is due to incomplete fixation of ascending colon may cause volvulus

Internal hernia

Small intestine passed into the mesentry of midgut during return of the intestines no symptoms

Stenosis/atresia of small intestine

Most often in ileum and duodenum incomplete recanalization or infarction most often occurs during 10th week

Ileal Diverticulum (Meckels)

Most common anomaly may cause symptoms mimicking appendicitis

Cloaca

Endoerm lined chamber in contact with surface ectoderm at cloacal membrane endoderm of cloaca ectoderm of proctoderm or anal pit

Dorsal Part of cloaca forms

Rectum and anal canal (7th week)

Vnetral part of cloaca forms

Urogenital sinus

Megacolon (Hirshsprung idsease)

Aganglionosis in the distal bowek | failure of neural crest cells to migrate into wall of colon during 5th-7th weeks

Imperforate anus

Incomplete seperation of of cloaca

Anal membrane perforates in

8th week

most common anorectal anomaly

Anorectal agenensis | causes [assage of muconium in urine

Embryology Flashcards

(84 cards)