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Portal Circulation
Portal System
A system wherein the venous blood starts from the capillary bed and conveys the blood to another capillary system instead of to the heart
Venous blood from abdominal digestive organs, the spleen and pancreas are drained into the liver.
Passing through another capillary bed (hepatic sinisoids) blood enters the inferior vena cava through the hepatic veins thence into the heart
Thus blood with high concentraion  of nutrient materials absorbed from the stomach and intestines goes to the liver first for metabolism.

Portal vein
Superior mesenteric vein unites with the the splenic vein and forms the portal vein
The following veins return venous blood through the portal vein : -
Splenic vein
(Inferior mesenteric vein - indirectly through splenic vein)
Superior mesenteric vein
gastric veins
cystic vein

The splenic vein drains - blood from the spleen, the pancreas and part of the stomach.
The superior mesenteric vein - blood from small intestine and the proximal colon - caecum, ascending and transverse colon.
The inferior mesenteric vein - blood from rectum, pelvic and descending colon. It joins the splenic vein
The gastric veins - glood from the stomach and the distal end of the oesophagus, then joins the portal vein.
The cystic vein - from gall bladder - joins the portal vein directly
Hepatic vein
very short veins - blood from liver into the IVC














Topic index : Anatomy - Cardiovascular system                                      Nursing       Anatomy   Question bank        Axillary artery    Vertebral artery        Arch of aorta    Spinal cord - Blood supply    Brain - Blood supply   right atrium  . Interior of the Heart  median cubital vein    Conduction system of heart   Portalvein     Veins of the  lowerlimb
Topic -  Index - Anatomy - Gastrointestinal System
                                       Medical Surgical Nursing      Nursing     The tongue    duodenum    Vermiform appendix   posterior relations of stomach  parotid gland    Pancreas                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                .                                                                                                                              
Topic    -    Index    Anatomy  -  Special Senses     special senses    middle ear    ciliary body   intrinsic and extrinsic muscles of the eye refractiveerrors
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Topic -  Index - Anatomy - Nervous System
                                     Medical Surgical Nursing      Nursing     The tongue        Vermiform appendix         Pancreas            Blood supply to brain   Blood supply to the spinal cord  pyramidal tract   brain stem      Circle of Willis    Meninges   Cerebellum structure and functions    composition and functions of CSF  Basal nuclei   circulation of CSF   Cranialnerves                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          .                                                                                                                              
Topic -  Index - Anatomy - Osteology
                                 Osteology    skull    axial skeleton    appendicular skeleton    bones and joints of the upper limb           bones of the skeleton        carpal bones   tarsal bones   joints of the lower limb    synovial joint        cranium    long bone    physiologyofbonehealing                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                .                                                                                                                              
                          Topic -  Index - Anatomy - Reproductive System          Reproductive system  Osteology    spermatic cord &  testis   uterus    uterus and its relationsuterine or Fallopian tubes     maleurethra      questionbank                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               .                                                                                                                              
Topic    -    Index    Anatomy  -  Special anatomical regions - hernia    cubital fossa    popliteal fossa       carpal tunnel    triangles of neck    
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Topic Index   - Anatomy -  Respiratory system -  lungs  trachea
Topic    -    Index   Anatomy  -  Cytolog and Histology -  cartilage    epithelium
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                                      System Index : Anatomy
Medical Surgical Nursing         Anatomy   question bank   short notes  cardiovascular system   nervous system   special senses   endocrine system   respiratory system  urinary sytem    myology,     git  special anatomical regions or mis        body homeostasis cytology & histology blood     reticuloendothelial system        nutrition   blood   reproductive system  osteology          powerpoints for teaching staff




Topic    -    Index   Anatomy  - Reticuloendothelial system       structure and function of the spleen    Lymph node
                          Topic -  Index - Anatomy - Urinary System       urinary bladder    ureter     kidney and other urinary organs      acute renal failure     male urethra      female urethra      prostate gland                 urinary stones
Embryology
fetal membranes      amnion   graafian follicle  chorion       i












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