This article mainly discusses the psychological characteristics of old patients having tooth pulled out on the view of medical ethics and tries to acquire its corresponding countermeasures.Through strenghtening the ethical education on oral and maxillofacial surgeons and giving right guidance to patients,it's helpful to lighten patients' burden and achieve good relationship and cooperation between doctors and patients to complete treatment successfully.

Objective To study the prelymphatic pathway in intestine. Methods Sudan black B was used to label fat which was fed to rats, then the pathway by which fat got into lacteals was observed under light and electron microscope. Results Under light microscope, we saw the blue\|greenish fat in epithelia, between epithelia, in lacteals and in the interstitial space around the lacteals. Under electron microscope, the pellets existed in epithelia, interstitial space and lacteals. Conclusion Fat might get into lacteals through the epithelia and the interstitial space which might be regarded as prelymphatic pathway. [