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Medical ArticlesResume Of After-care Of A Tracheotomic Case1. Always bear in mind that tracheotomy is not an ultimate ... Strychnine Emetic; keep quiet and darken the room. Chloral or bromide of ... Mechanical Problems Of Bronchoscopic Foreign Body Extraction* * For more extensive consideration of mechanical problems... Rose See Erysipelas. ... Itch See Rash. ... Human Dust WHEN we face the matter squarely and give it careful ... You Have No Idea How I Am Rushed A WOMAN can feel rushed when she is sitting perfectly... Children In Fever Fevered children, whether in any actual fever, as scarlet, typ... Earache - Otalgia This may arise from various causes, but a common one is sudde... Chloroform See Child-bearing. ... Ears Singing In The Partial deafness is often accompanied by noises in the ear, wh... Fever Typhoid Treat as under Fever, Gastric, and Fever. In addition, great c... Trismus Lockjaw For traumatic trismus, use the B D current, of vigorous force... Punctures Case Vii Mr. Parr, aged 30, of delicate habit, trod upon a needle whic... Mind Training IT will be plainly seen that this training of the bod... The Freedom Of Life I AM so tired I must give up work," said a young woma... Ulcers Case Xxi Mrs. Butcher, aged 52, has two ulcers a little above the oute... Giddiness And Trembling This comes very often as the result of loss of nerve power in ... Prognosis Janeway [Footnote: Janeway, T. C.: A Clinical Study of Hypert... Training For Motion "IN every new movement, in every unknown attitude nee... |
Dimensions Of The Trachea And BronchiCategory: ANATOMY OF LARYNX, TRACHEA, BRONCHI AND ESOPHAGUS, ENDOSCOPICALLY CONSIDERED Source: A Manual Of Peroral Endoscopy And Laryngeal Surgery It will be noted that the bronchi divide monopodially, not dichotomously. While the lumina of the individual bronchi diminish as the bronchi divide, the sum of the areas shows a progressive increase in total tubular area of cross-section. Thus, the sum of the areas of cross-section of the two main bronchi, right and left, is greater than the area of cross section of the trachea. This follows the well known dynamic law. The relative increase in surface as the tubes branch and diminish in size increases the friction of the passing air, so that an actual increase in area of cross section is necessary, to avoid increasing resistance to the passage of air. The cadaveric dimensions of the tracheobronchial tree may be epitomized approximately as follows: Adult Male Female Child Infant Diameter trachea, 14 X 20 12 X 16 8 X 10 6 X 7 Length trachea, cm. 12.0 10.0 6.0 4.0 Length right bronchus 2.5 2.5 2.0 1.5 Length left bronchus 5.0 5.0 3.0 2.5 Length upper teeth to trachea 15.0 23.0 10.0 9.0 Length total to secondary bronchus 32.0 28.0 19.0 15.0 In considering the foregoing table it is to be remembered that in life muscle tonus varies the lumen and on the whole renders it smaller. In the selection of tubes it must be remembered that the full diameter of the trachea is not available on account of the glottic aperture which in the adult is a triangle measuring approximately 12 X 22 X 22 mm. and permitting the passage of a tube not over 10 mm. in diameter without risk of injury. Furthermore a tube which filled the trachea would be too large to enter either main bronchus. The normal movements of the trachea and bronchi are respiratory, pulsatory, bechic, and deglutitory. The two former are rhythmic while the two latter are intermittently noted during bronchoscopy. It is readily observed that the bronchi elongate and expand during inspiration while during expiration they shorten and contract. The bronchoscopist must learn to work in spite of the fact that the bronchi dilate, contract, elongate, shorten, kink, and are dinged and pushed this way and that. It is this resiliency and movability that make bronchoscopy possible. The inspiratory enlargement of lumen opens up the forceps spaces, and the facile bronchoscopist avails himself of the opportunity to seize the foreign body. Next: The Esophagus Previous: Anatomy Of Larynx Trachea Bronchi And Esophagus Endoscopically Considered
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