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Abdomen Development, Peritoneal Folds Passageway for vessels, n…

- - - - Cranial limb: superior part of loop
        inferior duo, jejunum, iluem
        
        Wk 6-8 90 degrees counterclockwise rotation about the
        superior mesenteric a
        Cranial limb: now on right side
        Caudal limb now left side
        
        Retraction of Midgut
        8-11 wk: midgut retracts into abdomen + 180 degree
        counterclockwise rotatin about SMA
        Cranial limb gets pullled in first & moves to L of abdomen
        Caudal limn: pulled in next & moves R of abdomen
        
        **Elongation
        Wk 11 Ascending colon elongates
        Cecum moves to lower R quadrant w/. appendix
        Some organs lose mesentery and become 2 retro
      - Caudal limb: inferior part of loop
        Part of ileum, large intesting-1/2 transverse colon
  - - - Urorectal spetum: wedge of mesenchyme divides cloaca into dorsal and ventral parts
        
        Cloacal Division
        Urorectal septum forms partiition dividing cloaca --> rectum (dorsally)
        & uriniary parts (ventrally)
        
        Anal Canal Development
        
        Superior anal canal 2/3 from hindgut (endoderm)
        
        Inferior anal canal 1/3 from anal pit (ectoderm)
        Somatic Innervation
        
        Tip of septum fuses with cloacal membrane
        --> future pernieum
        
        Anterior urogenital
        
        Breakdown week 8
        
        Posterior anal membrane
  - - - TRACHESOPHAGEAL SEPTUM
        Recanalize (reopen tube) 8th wk
        Striated skeletal muscle in 1/3--> chose to swallow
        Smooth muscle in 1/3 -->splanchnic mesenchyme
    - - 4th wk: appears as fusiform (spindle-shaped) dilation of foregut
        
        5 wk: Dorsal wall of stomach grows faster than ventral walls
        Greater and Lesser Curvutrure
        
        STOMACH ROTATION-Vertical-horizontal
        7 wk: 90 degrees clockwise on longitudinal axis
        
        L side is now anterior (left vagus)
        
        R side is now posterior (Right vagus)
        LARP
    - - Duodenum rotates R -->grows C-shaped
        Most is secondarily retroperitoneal
        Recanalized Lumen
      - Accessory Organs
        
        3 wk: liver bud (hepatic diverticulum appears)
        All accessory organs
        
        Liver
        
        bile duct
        Week 4-6 connection to foregut narrows
        
        Gallbladder and cystic duct
        Outgrowth (cystic diverticulum forms) on bile duct
        
        Pancreas
        Wk 4-6 develops from two endodermal buds
        
        Dorsal Pancreatic bud: most of pancreas
        (neck, body, tail)
        
        Wk 6 ventral bud rotates clockwise behind developing duodenum
        
        Ventral pancreatic bud : Inferior part of head and
        Uncinate process
        
        Fuse with dorsal bud
        
        Spleen
        Develops from mesoderm/mesenchyme
        
        Gerows with dorsal mesentery & swings to left with rotation of stomach
        
        Vascular and lymphatic organ:
        HEMATOPOIETIC centerl until late fetal stage
- - - - Dorsal Mesentery
        From greater curvature of stomach to PAW
        
        Gastrosplenic omentum
        
        Lienorenal ligamewnt
        
        Spleen
        
        Greater omentum (gastrophrenic ligament)
        Stomach pulls this anterior/inferior
        4 layers
        
        gastrosplenic ligament
        
        Cura of Espohagus
    - - 2 pericardioperitoneal canals
        LATERAL to foregut
      - Periotoneal cavity
      - Pericardial
      - Two Linings
        (create double layer of peritoneum)
        
        Parietal layer
        (SOMATIC mesoderm)
        
        Visceral layer
        (Splanchnic mesoderm)
        
        Disappears except @ Caudal foregut
      - Membranes
        
        Pleuropericardial membranes
        Diaphragm only not forgut
        
        Pleuropertioneal membranes
        6th week: ventromedially fuse dorsal mesentery &
        Septum Transversum
        
        Separate pleural and peritoneaal
        Closure of opening assisted by migratory myoblasts
        Primordial muscle cells)
        
        Create Diaphragm (4 structures)
        
        Septum transversum CT CENTRAL TENDON: Cervical somite's 3-5: PHRENIC
        
        2 Pleuropertioneal folds/membranes: cardinal veins
        
        Dorsal mesentery of esophagus: Crura & hiatuses for IVC, Aorta, Esophagus
        
        Lateral body walls: muscular ingrowth (myoblasts)
    - - Ventral Mesentery
        From lesser curvature to ST & anterior abd wall
        
        Coronary ligament
        
        Falciform ligament
        
        Lesser omentum
        stomach to liver (2 layers)
        
        Hepatogastric ligament
        [R/L gastric a]
        
        Hepatoduodenal ligament
        [portal triad]
        
        B/L Triangular ligaments
      - Visceral (not stripped, autonomic,
        visceral vessels)
        Splanchnopleuric layer of lateral plate mesoderm