1. In a tabular form, list the muscles of respiration and their nerve supply 2. Describe about...

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Medical Sciences

1. In a tabular form, list the muscles of respirationand their nerve supply

2. Describe about the venous drainage of the thoracic cavity

3. Write about the surface anatomy of the lungs andpleurae

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Ans 1 Muscles of inspiration Diaphram phrenic nerves from C3 to C5 External intercostal thoracic spinal nerve Expiration muscles Internal intercostal thoracic spinal nerves Forced expiration Rectus abdominus lower thoracic nerves T5 T 12 External and internal oblique lower intercostal nerves iliohypogastric nerve and ilioinguinal nerve 2 Venous drainage of thoracic cavity The inferior vena cava is the inferior of the two venae cavae the large veins that carry deoxygenated blood from the body into the right atrium of the heart The inferior vena cava carries blood from the lower half of the body whilst the superior vena cava carries blood from the upper half of the body It is formed by the joining of the right and the left common iliac veins usually at the level of the fifth lumbar vertebra The azygos vein is a vein running up the side of the thoracic vertebral column draining itself towards the superior vena cava It connects the systems of superior vena cava and inferior vena cava and can provide an alternative path for blood to the right atrium when either of the venae cavae is blocked The internal jugular vein is a See Answer

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