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As they enter the lungs these primary bronchi branch into secondary bronchi known as lobar bronchi which supply each lobe of the lung. These in turn give rise to tertiary bronchi (tertiary meaning "third"), known as segmental bronchi which supply each bronchopulmonary segment. [1]
The lower respiratory tract or lower airway is derived from the developing foregut and consists of the trachea, bronchi (primary, secondary and tertiary), bronchioles (including terminal and respiratory), and lungs (including alveoli). [7] It also sometimes includes the larynx.
The secondary bronchi divide further into tertiary bronchi, (also known as segmental bronchi), each of which supplies a bronchopulmonary segment. A bronchopulmonary segment is a division of a lung separated from the rest of the lung by a septum of connective tissue .
These enter the lungs where they branch into progressively narrower secondary and tertiary bronchi that branch into numerous smaller tubes, the bronchioles. In birds, the bronchioles are termed parabronchi. It is the bronchioles, or parabronchi that generally open into the microscopic alveoli in mammals and atria in birds.
A primary pulmonary lobule is the part of the lung distal to the respiratory bronchiole. [29] Thus, it includes the alveolar ducts, sacs, and alveoli but not the respiratory bronchioles. [30] The unit described as the secondary pulmonary lobule is the lobule most referred to as the pulmonary lobule or respiratory lobule.
Secondary gain can also be a component of any disease, but is an external motivator. If a patient's disease allows them to miss work, avoid military duty, obtain financial compensation, obtain drugs , avoid a jail sentence, etc., these would be examples of a secondary gain.
The former chief of staff to U.S. Rep. Alexandria Ocasio-Cortez, D-N.Y., announced Wednesday his intention to run against Rep. Nancy Pelosi, D-Calif., calling the Democratic Party "paralyzed and ...
The lung bud branches into two lateral outgrowths known as the bronchial buds, one on each side of the trachea. The right and left bronchial buds branch into main (primary), lobar (secondary), segmental (tertiary), and subsegmental bronchi and lead to the development of the lungs. [2]