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Table 1 Interspecies comparison of Lung lobes

From: A left lung with four lobes: a new discovery during the thoracotomy for recurrent primary spontaneous pneumothorax

  Number of right lung lobes Description of right lung lobes Number of left lung lobes Description of left lung lobes
Human (1, 2) 3 2
Dog (2, 3) 4 Cranial, middle, caudal, and accessory lobes 2 or 3 Apical, middle, and diaphragmatic lobes, left apical and middle lobes are partially fused, being separated only by an incomplete (cranial) fissure
Cat (2, 4) 4 Cranial, middle, caudal and accessory lobes 2 or 3 Apical (cranial), middle (cardiac), and diaphragmatic (caudal) lobes (3 lobes theory) versus apical (cranial) and diaphragmatic (caudal) lobes (2 lobes theory)
Bovine (5) 4 Cranial, middle, caudal and accessory lobes 2 Cranial and caudal lobes
Horse (2, 6) 1 Cranial, middle, caudal and accessory lobular divisions are united to form 1 lobe 1 Cranial, middle, caudal and accessory lobular divisions are united to form 1 lobe
Raccoon (2) 4 3
Equine (7) 3 cranial, caudal and accessory lobes 2 Cranial and caudal lobes
Mouse (2, 9, 10) 4 Cranial, middle, caudal, and accessory lobes 1 No division
Rat (2, 10, 11) 4 Upper, middle, accessory and lower lobes 1 The upper and accessory lobes are lost. The middle and lower lobes are united to form one lobe
Hamster (11) 5 cranial, middle, caudal, intermediate, accessory 1 Single lobe