The medical title of `` Lobar Ventilation In Man '' by Drs. C. J. Martin and A. C. Young, covers a brief paper which is one part of a much larger effort to apply electronics to the study of the respiratory process.

* Lobar holoprosencephaly, in which there is considerable evidence of separate brain hemispheres, is the least severe form.

The classification of Primary Progressive Aphasias, has a clinical and pathological overlap of Frontotemporal Lobar Degeneration ( FTLD ) spectrum of disorders and Alzheimer pathology.

* Lobar ducts ( right and left hepatic ducts )-stratified columnar epithelium.

Mainstem bronchus < BR > 3.

Segmental bronchus < BR > 5.

Schematic drawing of an avian syrinx1: last free cartilaginous tracheal ring, 2: tympanum, 3: first group of syringeal rings, 4: pessulus, 5: membrana tympaniformis lateralis, 6: membrana tympaniformis medialis, 7: second group of syringeal rings, 8: main bronchus, 9: bronchial cartilage

The bronchus and pulmonary artery in this lung type maintain a close relationship throughout.

Distally the bronchus is situated between a pulmonary artery on one side and a pulmonary vein on the other, as in type 1 ( ( fig. 24 ).

Here the pulmonary vein, as in type 2,, is noted to draw away from the bronchus, and to follow a more direct, independent course to the hilum ( figs. 23, 24 ).

In type 1 the pulmonary vein closely follows the course of the bronchus and the pulmonary artery from the periphery to the hilum.

The lung of most reptiles has a single bronchus running down the centre, from which numerous branches reach out to individual pockets throughout the lungs.

The right vagus then crosses anteriorly to the right subclavian artery and runs posterior to the superior vena cava and descends posterior to the right main bronchus and contributes to cardiac, pulmonary, and esophageal plexuses.

The blockage may be caused by something inside the bronchus, such as a plug of mucus, a tumour, or an inhaled foreign object such as a coin, piece of food, or a toy.

It is possible for something outside of the bronchus to cause the blockage.

* Lymph nodes of the lungs: The lymph is drained from the lung tissue through subsegmental, segmental, lobar and interlobar lymph nodes to the hilar lymph nodes, which are located around the hilum ( the pedicle, which attaches the lung to the mediastinal structures, containing the pulmonary artery, the pulmonary veins, the main bronchus for each side, some vegetative nerves and the lymphatics ) of each lung.

They incorporate an endotracheal lumen which terminates in the trachea and an endobronchial lumen, the distal tip of which is positioned 1 – 2 cm into the right or left mainstem bronchus.

Even though the cross-sectional area of each bronchus or bronchiole is smaller, because there are so many, the total surface area is larger.

A bronchus ( plural bronchi, adjective bronchial ) is a passage of airway in the respiratory tract that conducts air into the lungs.

The bronchus branches into smaller tubes, which in turn become bronchioles.

The right main bronchus is wider, shorter, and more vertical than the left main bronchus.

The right main bronchus subdivides into three lobar bronchi, while the left main bronchus divides into two.

While the left mainstem bronchus departs from the trachea at an angle, the right mainstem bronchus is almost a vertical continuation of the trachea.

* If food, liquids, or foreign bodies are aspirated, they often will lodge in the right mainstem bronchus.

* If the endotracheal tube used for intubation is inserted too far, it usually lodges in the right mainstem bronchus.

Image: Tertiary bronchus. JPG | Cross sectional cut of primary bronchiole

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