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 bronchus now passes below the artery, and is known as the hyparterial branch ; it divides into two branches for the middle and lower lobes.

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.

If it is inserted too far into the trachea ( beyond the carina ), the tip of the tracheal tube is likely to be within the right main bronchus — a situation often referred to as a " right mainstem intubation ".

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

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

The BVM directs the gas inside it via a one-way valve when compressed by a rescuer ; the gas is then delivered through a mask and into the patient's trachea, bronchus and into the lungs.

The new section of trachea was then transplanted into the left main bronchus of the patient.

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

* 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.

Outside of this context, atelectasis implies some blockage of a bronchiole or bronchus, which can be within the airway ( foreign body, mucus plug ), from the wall ( tumor, usually squamous cell carcinoma ) or compressing from the outside ( tumor, lymph node, tubercle ).

Nasal mucus is produced by the nasal mucosa, and mucal tissues lining the airways ( trachea, bronchus, bronchioles ) is produced by specialized airway epithelial cells ( goblet cells ) and submucosal glands.

They are found inside the trachea, bronchus, and larger bronchioles in respiratory tract, small intestines, the colon, and conjunctiva in the upper eyelid.

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 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.

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

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

Mainstem bronchus < BR > 3.

Lobar bronchus < BR > 4.

Segmental bronchus < BR > 5.

In 1825, the Boston house carpenters' strike for a ten-hour day was denounced by the organized employers, who declared: `` It is considered that all combinations by any classes of citizens intended to effect the value of labor tend to convert all its branches into monopolies ''.

In the United States, anthropology is traditionally divided into five sub-fields, each with additional branches: biological or physical anthropology, social anthropology or cultural anthropology, archaeology and anthropological linguistics.

Anthropology ( like some fields of history ) does not fit easily into one of these categories, and different branches of anthropology draw on one or more of these domains.

The axons of some neurons branch to form axon collaterals, that can be divided into a number of smaller branches called telodendria.

Ancient Pueblo culture has been divided into three main areas or branches, based on geographical location:

His influence spilled over into many other branches of mathematics, for example the contemporary theory of D-modules.

The federal government exercises control over the central government and is divided into three independent branches: executive, legislative and judicial.

The Armed Forces of Brazil are divided into 3 branches:

These ancient breeds then migrated South ( founding the Tazi / Saluki branch ) and West ( founding the Stepnaya, Krimskaya and Hortaya branches ) to develop into breeds adapted to those regions.

The family later separated into two branches: Buonaparte-Sarzana, Nobili di Sarzana had been compelled to leave Florence due to the defeat of the Ghibellines and later when Francesco Buonaparte came to Corsica in 16th century and the island was in Genoese possession.

By 1000 BC ancient civilizations were using technologies that formed the basis of the various branches of chemistry such as ; extracting metal from their ores, making pottery and glazes, fermenting beer and wine, making pigments for cosmetics and painting, extracting chemicals from plants for medicine and perfume, making cheese, dying cloth, tanning leather, rendering fat into soap, making glass, and making alloys like bronze.

The Army is going to be called the Cape Verdean National Guard, and it will be divided into three semi-autonomous branches:

Mehmed had his people pave a path from oiled tree branches in order to bring eighty ships overland, and placed them into the gulf behind the enemy ships.

In most modern nation states, power is divided and vested into three branches of government: The Executive, the Legislature and the Judiciary.

The local branches are grouped into 16 regional branches across the UK, such as the West Midlands or Wessex.

The Capetian Dynasty has been broken many times into ( sometimes rival ) cadet branches.

The city is along the Nile River, immediately south of the point where the river leaves its desert-bound valley and branches into the low-lying Nile Delta region.

At the 14th Party Congress ( 18 – 31 December 1925 ) Kamenev and Zinoviev were forced into the same position that Trotsky had been forced into previously ; they proclaimed that the center was usurping power from the regional branches, and that Stalin was a danger to inner-party democracy.

Another Lapith hero, Caeneus, who was invulnerable to weapons, was beaten into the earth by Centaurs wielding rocks and the branches of trees.

A number of respected monthly publications, including the popular science magazine " Наука и жизнь " (" Science and Life "), featured special columns, dedicated to optimization techniques for calculator programmers and updates on undocumented features for hackers, which grew into a whole esoteric science with many branches, known as " yeggogology " (" еггогология ").

They consist of erect cylinder-shaped stems, which may or may not branch, without a very clear division into trunk and branches.

This family is divided into a number of branches, including Romance, Germanic, Baltic, Slavic, Albanian and Greek.

The endoplasmic reticulum ( ER ) is a synthesis and transport organelle that branches into the cytoplasm in plant and animal cells.