الفهرس 
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Abstract
EXperimental btudies were performed upon resection and anastomosis
of the cervical trachea on 81 clinicallJ healthJ dogs. In addition 20 dogs were used to studY the surgical anatoIDJof the dog’s trachea.
The animals were divided into four main groups according to the aim of operation performed.
First group (20 dogs), animals of this group were sacrificed to studY the surgical anatom;yof the trachea including, number of tracheal rings, length of the trachea, width of tracheal rings,
and transverse and dorso-ventral diameters.
Second group (36 dogs), animals were subjected to 5, 10, 15 and 18 or 19 tracheal rings resection with the use of silk No. 3/0 and sta,}’and interannular interrupted stitches in addition to the use of chromic catgut No. 3/0 for tracheal anastomosis after 5 and 10 tracheal rings resection. Some of these animals were subjected
to radiological eXamination.
Third group (18 dogs), in this group 3 different suture techniques nameIy , sta,y sutures ,interannular interrupted stitches and stay withinterannular interrupted were tested.
Fourth group (27 dogs), in this group chromic catgut No. 3/0, silk No. 3/0 and Merseline No. 3/0 were tested respectivelJ for tracheal anastomosis and the tissues reaction to these materials
were recorded. The obtained results can be summerised as fol1ows:-
1. The.average total number of the tracheal rings is 38 (22
cervicul and 16 thoracic).
2. The average length of the trachea is 17 em. (10 em. cervical
and 7cm. thoracic).
3. The average width of traoheal cartilage is 0.4 Cm.
4. The maximum number of tracheal rings resection varied between
18-19 tracheal rings with non significant post-operative complic
cations.
5. The stay sutures alone for small tracheal resections and its
combinations with interannular interrupted technique in massive resection are the most sutible suture pattern for tracheal anastomosis.
6. Flexion of the neck during massive tracheal resection is essent~
ialfor apprOXimation of the tracheal stumps.
7. Chromic catgut No~ 3/0 is the material of choice for small tracheal resections.
8. Bilk No. 3/0 is the suitable suture material for massive tracheal resection inspite of many disadvantages!.