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21-1 Lecture 19 Circulatory System II. 21-2 Capillary Network Capillary network made of arterial and venous capillaries Venules drain network Blood flows.

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Presentation on theme: "21-1 Lecture 19 Circulatory System II. 21-2 Capillary Network Capillary network made of arterial and venous capillaries Venules drain network Blood flows."— Presentation transcript:

1 21-1 Lecture 19 Circulatory System II

2 21-2 Capillary Network Capillary network made of arterial and venous capillaries Venules drain network Blood flows into small veins, medium and large veins Valves –Allow blood to flow toward heart but not in opposite direction Fig. 23.5

3 21-3 Systemic Circulation: Veins Return blood from body to right atrium Major veins –Coronary sinus (heart) –Superior vena cava (head, neck, thorax, upper limbs) –Inferior vena cava (abdomen, pelvis, lower limbs) Types of veins –Superficial, deep, sinuses

4 21-4 How Do the Three Types of Veins Differ? Superficial veins –Closer to the surface of the body Deep veins –Typically found deeper in the body and usually next to major arteries –Typically share names with arteries (e.g. femoral vein next to femoral artery) Sinuses –A modified, slightly expanded vein that lacks smooth muscle –Incapable of changing diameter

5 21-5 Veins Draining the Heart Cardiac veins (Great and Small) –Drain the left and right sides of the heart Venous blood collects in coronary sinus –Empties into right atrium Fig. 22.9

6 21-6 Venous Sinuses of the Cranium Fig Dural venous sinuses receive blood that has circulated through the brain and orbit Blood from these sinuses empties into internal jugular vein Internal jugular vein exits skull through the jugular foramen between temporal and occipital bones Internal jugular vein Dural venous sinuses

7 21-7 Veins of Head and Neck Vertebral veins –Travel with vertebral artery through transverse foramina of cervicals –Drain cervicals, spinal cord, deep neck muscles Vertebral vein External jugular vein Internal jugular vein Subclavian vein Right brachiocephalic vein Fig

8 21-8 Review Question Fusion of the brachiocephalic veins will form the (a)Subclavian vein (b)Inferior vena cava (c)External jugular vein (d)Superior vena cava (e)Axillary vein

9 21-9 Veins of Shoulder and Upper Limb Fig Deep veins –Radial and ulnar veins (paired) –Brachial vein that connects with axillary vein Superficial veins –Basilic vein (becomes axillary vein) –Cephalic vein Axillary vein becomes subclavian vein beneath clavicle Superficial veins Deep veins Ulnar veins Radial veins Brachial veins Basilic vein Cephalic vein Axillary vein Subclavian vein

10 21-10 Veins of Abdomen and Pelvis Fig Right renal vein Left femoral vein Left internal iliac vein Left external iliac vein Left common iliac vein Inferior vena cava Left renal vein Diaphragm

11 21-11 Hepatic Portal System Portal system –Begins and ends in capillaries –Heart not part of system Hepatic portal system –Begins with viscera of abdomen –Ends with liver Fig Superior mesenteric vein Ascending colon Duodenum Pancreas (cut) Hepatic portal vein Liver Inferior vena cava Diaphragm Stomach Gastric veins Spleen Splenic vein Inferior mesenteric vein Small intestine Descending colon

12 21-12 Veins of Pelvis and Lower Limb Deep veins –Anterior and posterior tibial veins –Popliteal vein –Femoral vein Superficial veins –Great saphenous vein External iliac vein Internal iliac vein Superficial veins Deep veins Posterior viewAnterior view Great saphenous vein Femoral vein Popliteal vein Anterior tibial veins Posterior tibial veins Great saphenous vein Internal iliac vein External iliac vein Common iliac vein Fig

13 21-13 Valves in Veins -Found in medium size veins -Allow a one-way direction of blood back to the heart Varicose Veins -Found in superficial veins because there isn’t skeletal muscles around the vein. -Hemorroids

14 21-14 Points to Remember 1.Three major types of veins: superficial, deep and sinuses 2.Venous blood carried to heart by coronary sinus, superior vena cava and inferior vena cava 3.Hepatic portal system - not connected directly to heart

15 21-15 Questions?


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