Embryo/Anatomy Flashcards
Extrusion of abdominal contents through abdominal folds, not covered by peritoneum
Gastroschisis
Persistence of herniation of abdominal contents into umbilical cord, sealed by peritoneum
Omphalocele
Failure of Rostral fold closure
Sternal Defects
Failure of Lateral fold closure
Omphalocele, Gastroschisis
Failure of Caudal fold closure
Bladder Exstrophy
Failure to recanalize
duodenal atresia (assoc with Downs)
Apple Peel atresia due to vascular accident
Jejunal, ileal, colonic atresia
When midgut herniates through umbilical ring
6th week
when midgut returns to abdominal cavity and rotates around SMA
10th weeks
Most common traceoesophageal anomalies
esophageal atresia with tracheoesophageal fistula
Drooling, choking, and vomiting with first feeding
Tracheoesophageal Anomalies
Pure Tracheoesophageal fistula
H-type Tracheoesophageal Anomalies
Gasless Abdomen on CXR
Pure esophageal atresia
Palpable olive mass is epigastric region
Congenital pyloric stenosis
Nonbilious projectile vomiting at 2-6wks
Congenital Pyloric Stenosis
Ventral Pancreatic buds
Pancreatic head and main pancreatic duct, Uncinate process
Dorsal Pancreatic Bud
Body, tail, isthmus, and accessory pancreatic duct
Annular pancreas
ventral pancreatic bud abnormally encircles 2nd part of duodenum; causes duodenal narrowing
Pancreas divisum
ventral and dorsal pancreas fail to fuse at 8weeks
Failure of vitelline duct to involute
Meckel Diverticulum
Hepatoduodenal Ligament
Portal Triad: proper hepatic artery, portal vein, common bile duct
Pringle Maneuver
Compression of the hepatoduodenal ligament to control bleeding
Connects liver to the anterior abdominal wall
Falciform ligament
Fetal umbilical vein
Falciform ligament
Ligamentum teres hepatis
Within Falciform ligament
Liver to lesser curvature of stomach
Gastrohepatic ligament, contains gastric arteries
Gastrocolic ligament
contaiins gastroepiploic arteries, from greater curvature to TV colon
Contains left gastroepiploic vessels, separates greater and lesser sacs on the left
Gastrosplenic ligament
Spleen to posterior abdominal wall
Splenorenal ligament, contains the splenic artery and vein, tail of pancreas
Layer of gut wall with Myenteric (Auerbach) nerve plexus
Muscularis externa
Layer of gut wall with Meissner plexus
Submucosa
Basal electrical rhythm in Stomach, Duodenum and Ileum
Stomach - 3waves/min
Duodenum - 12 waves/min
Ileum - 8-9waves/min
Nonkeratinized stratified squamous epithelium
Esophagus
Brunner’s glands
Duodenum
Plicae Circulares
jejunum and prox ileum
Peyers Patches
Ileum
Largest # of Goblet cells in small intestin
Ileum
3rd part of duodenum is entrapped
SMA syndrome
Celiac artery
vagus, level T12/L1, pharynx to prox duodenum, liver, GB, pancreas, spleen
SMA
Vagus, level L1, distal duodenum to prox 2/3 TV colon
IMA
Pelvic, level L3, Distal 1/3 TV colon to upper rectum
Branches of Celiac Trunk
Common hepatic, splenic, left gastric
Superior epigastric (internal thoracic/mammary) anastamoses with
Inferior epigastric (external iliac)
Superior Pancreaticoduodenal (celiac trunk) anastamoses with
Inferior Pancreaticoduodenal (SMA)
Middle Colic (SMA) anastamoses with
Left Colic (IMA)
Superior Rectal (IMA) anastamoses with
Inferior Rectal (internal iliac)
Left gastric vein(portal) anastamoses with
esophageal vein (systemic)
Paraumbilical vein (portal) anastamoses with
small epigastric veins of anterior abdomonial wall (systemic)
Superior rectal vein (portal) anastamoses with
middle and inferior rectal veins (systemic)
Transjugular intrahepatic portosystemic shunt (TIPS)
between portal vein and hepatic vein percutaneously relieve portal HTN by shunting blood to the systemic circulation
Pectinate Line
When endoderm (hind gut) meets ectoderm
Internal hemorrhoids
Above pectinate line, not painful
superior rectal artery (IMA)
superior rectal vein (portal)
Lymph drainage above pectinate line
Deep Nodes
External Hemorrhoids
Below pectinate line, painful
inferior rectal artery (int. pudendal artery)
inferior rectal vein (drains to int pudendal v then internal iliac vein and IVC)
Lymphatic drainage below pectinate line
Superficial inguinal nodes
Innervation for external hemorrhoids
inferior rectal branch of pudendal nerve, thus painful
Affected 1st by Viral Hepatitis
Zone 1, periportal zone
Affected 1st by ingested toxins
Zone 1, periportal zone
Affected 1st by ischemia
Zone 3, pericentral vein or centrilobular zone
Contains cytochrome P450 system
Zone 3, pericentral vein or centrilobular zone
Most sensitive to metabolic toxins
Zone 3, pericentral vein or centrilobular zone
Site of Alcoholic Hepatitis
Zone 3, pericentral vein or centrilobular zone
Space of Disse
lymphatic drainage for liver
Blood Flow in liver
Zone 1 to Zone 3 (central vein)
Bile Flow in liver
Zone 3 to Zone 1 (bile ductule)
Gallstone in ampulla of Vater
block both bile duct and pancreatic ducts
Tumors in head of pancreas
Can obstruct common bile duct
Femoral triangle
Lateral to Medial NAVeL
femoral nerve, artery, vein, lymph
Femoral Sheath
3-4cm below inguinal ligament
femoral vein, artery and deep inguinal LN
Site of protrusion of indirect hernia
Internal inguinal ring
Site of protrusion of direct hernia
Abdominal Wall
Lateral to medial umbilical ligament and medial to inferior epigastric vessels
Where internal spermatic fascia is from
transversalis fascia
where cremasteria muscle/fascia is from
internal oblique
where external spermatic fascia is from
external oblique
Hourglass stomach
Sliding hiatal hernia
fundus protrudes into thorax, Lung hypoplasia in young
Paraesophageal Hernia
Defective development of pleuroperitoneal membrane
Diaphragmatic hernia
Hernia through internal (deep) inguinal ring
Indirect hernia (in spermatic cord)
Hernia in infants
Indirect hernia
Failure of processes vaginalis to close
indirect hernia or hydrocele
Medial to inferior epigastric artery
Direct hernia
Protrudes through Hesselbach triangle
Direct Hernia
Hernia in Older men
Direct Hernia
Protrudes below inguinal ligament
Femoral Hernia (more common in females)
Leading cause of Bowel incarceration
Femoral Hernia
Hesselbach Triangle
inferior epigastric, lateral border of rectus abdominus, inguinal ligament
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