The left and right lungs lie within their [[Pleural Cavity and Membranes - Anatomy & Physiology|pleural]] sac and are only attached by their roots, to the [[Mediastinum - Anatomy & Physiology|mediastinum]], so they are fairly free within the thoracic cavity. The right lung is always larger than the left, due to the positioning of the [[Heart - Anatomy & Physiology|heart]].
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The lungs are divided into lobes by the bronchial tree:
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* Left lung
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**Cranial and caudal lobes, the cranial lobe is '''not''' subdivided into cranial and caudal parts
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* Right Lung
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**Cranial, caudal and accessory loves. The middle lobe is absent.
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'''Left Lung''' - Cranial and Caudal lobes.
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Although lobulated, the lobes are not divided by deep fissures in the horse; making them appear the least lobulated of the common domestic species.