Sinus Frontalis Superior Nasal ConchalInferior Nasal Concha Nasal CavitySinus Sphenoidalis Alveoli Larynx Nasopharynx
Oropharynx Laryngopharynx Frontal SinusSphenoid SinusEthmoid Sinus Maxillary SinusBronchus Vertebrate Trachea Bronchioles Capillary Beds
Alveolar Duct Alveolar Sacs Pulmonary VeinPulmonary Artery
TEXTURE OF LUNGS
The lungs are roughly conical organs that are soft, light and spongy occupying the pulmonary spaces in chest. The lungs are bright pink colored organs that are slippery on handling.
PARTS OF A LUNG
The lungs are further divided into different parts to understand them more easily. Following are the main parts of lungs:
Apex, the blunt and upper end of lungs
Base, the concave and lower surface of lungs
Lobes, the divided parts of lung by two or more fissures. Right lung has three lobes (upper, middle and lower) separated by two fissures (oblique fissure separating lower lobe from the middle lobe and horizontal fissure separates middle lobe from upper lobe). Left lung, on the other hand, has two lobes (upper and lower) separated by one fissure (oblique fissure).
HILUM OF LUNGS (DOORWAY TO LUNGS)
The wedge shaped small area facing the mediastinal surface medially is known as hilum through which the vessels and air ducts enter and leave the lungs. Hence it is a gateway to the lungs. This area is covered and protected by the pleural sheath, known as pleural sleeve.
Following structures are present in lungs’ hilum:
BLOOD AND NERVE SUPPLY
The lungs are supplied by a pulmonary artery that supplies blood to lungs and two pulmonary veins that drain blood out of lungs. Nerve supply is provided by pulmonary plexus.