The Venous System (part01)
All the systemic veins return blood to the right atrium of the heart through superior vena cava and inferior vena cava Superior vena cava is formed by two brachiocephalic veins that bring the blood from head neck upper extremities and some part of the thorax
The blood from deeper part of face brain and neck is brought by right and left internal jugular vein whereas from salivary glands facial muscles scalp and that from other superficial structures is brought by right and left external jugular veins these jugular vein unite with subclavian vein and the union of these form respective brachiocephalic veins
Subclavian veins bring the blood from the respective upper limbs this vein is axillary vein in axilla in the upper arm there are brachial cephalic and basilic veins that join to from axillary vein in the fore arm there are radial and ulnar veins that join with the veins of upper arm Radial vein receives blood from metacarpals and ulnar form the fingers through various veins joining to form palmar arch
Inferior vena cava is formed by the union of two common iliac veins that drain the blood from lower extremities and abdomen Inferior vena cava extends upwards through abdomen and thorax to open in the right atrium
In the thorax inferior vena cava receives azygos and hemiazygos veins that bring the blood from the thorax region In the abdominal region inferior vena receives renal veins (from kidneys) gonadal veins (from testes or ovaries) suprarenal veins (from adrenal glands) hepatic vein (from liver) lumbar veins (from abdominal wall) and hypogastric or internal iliac veins (from gluteal muscles medial side of the thigh urinary bladder prostate gland vas-deferens uterus and vagina )
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