RESUMEN
The relation between molar attrition and age was studied in 208 skulls Chinese male of cadavers from the Liaoning province. The ages of these cadavers range from 15 to 61 years. The total number of teeth studied are: 658 first molars and 601 second molars. The degree of attrition was divided into six grades. Results may be summarized as follows:1. The degree of molar attrition increases with age.2. The second molar is less attrited thanthe first one in the same jaw be'cause it crupts later, and the age ratio (in years) between M_1 and M_2 is about 6:7.3. The degree of molar attrition on both sides and both jaws is symmetrical in 63?1.9％, but no general rule can be found.4. A regressive equation of molar attrition has been obtained.
RESUMEN
The origin, pattern, caliber, projection on the body surface and anastomoses of the cutaneous arteries within the lateral thoracic flap have been studied in 33 cases (sides): adults- 30 cases, children- 3 cases. The chief results are as follows:1. Four types of cutaneous arterial supply within this flap be divided according to the number of branches: one branched type(51.51%?8.70), two branched type(27.27%?7.75), three branched type(15.15%?6.24), four branched type(6.06%?4.15).2. Lateral thoracic cutaneous arteries may arise from one to four of the brachial, lateral thoracic, axillary, dorsal thoracic, subscapular or thoraco-acromial arteries. The caliber of their origin varies between 1.23～1.75mm. The thoracoepigastric vein which drains blood into the lateral thoracic vein may be regarded as the main cutaneous vein in the flap area. The caliber of its end is 3.35?0.42 mm. This vein provided with valves.3. There are plenty of cutaneous arterial anastomoses within the lateral thoracic flap. In the radiograph the networks of blood vessels may be seen among the branches of the cutaneous arteries. These networks are distributed over the whole flap.4. The blood vessels of the lateral thoracic flap and its application have been discussed and the position of skin incisions and landmark of the cutaneous arteries been proposed in the article.
RESUMEN
The cutaneous arteries of the forearm and their anastomoses in skin and subcutaneous tissue were invetigated on 35 upper limbs.1. The average length of the radial artery is 215.3 mm. This artery can be divided into a covered part and a exposed part. Their lengths are 117.7 mm. and 101.4 mm. respectively. The calibers of the upper end, the intermediate point, and the lower end of the radial artery are 2.7mm, 2.3 mm and 2.4 mm respectively.2. The exposed part of the radial artery sends out more cutaneous branches (9.6 branches) than the covered part (4.2 branches), While their muscular branches are nearly equal in number. The calibers of the cutaneous and muscular branches of the radial artery varies from 0.3～0.5 mm.The fine anastomoses of the cutaneous branches exist between the radial and ulnar arteries and between the radial and ulnar arteries and the dorsal interosseus artery and they form an arterial networks in the subcutaneous tissue of the whole forearm. For blood supply a skin flap may be cut from the whole forearm from the standpoint of morphology.4. The calibers of the radial and cephalic veins at the level of middle part of the forearm are 1.3 mm and 2.8 mm respectively. As the vasular pedicle both the veins should be anastomosed during transplant operation in order to increase the volume of the draining blood.5. The skin flap of forearm blongs to a type of blood supply of arterial trunk network, which have been distinguished with that of some other skin and myocutaneous flaps according to the anatomical characteristics of the radial artery.