FREE BOOKS

Author's List




PREV.   NEXT  
|<   120   121   122   123   124   125   126   127   128   129   130   131   132   133   134   135   136   137   138   139   140   141   142   143   144  
145   146   147   148   149   >>  
focated with house-hold gas. It should be killed immediately before use, as otherwise the gastric juice attacks the wall of the stomach, and the dissection is, in consequence, rendered extremely disagreeable. A very young rabbit is unsatisfactory as regards the genitalia, but otherwise there is no objection to a little one, and it has this advantage-- that it may be immersed more conveniently under water, in a large pie dish, for purposes of fine dissection. The external features of the animal should be examined: eyelids, whiskers and teeth, toes, anus, perineal space on either side of the same, urogenital opening, and position of the ribs, vertebral column, and limb girdles beneath the skin should be made out. Then the animal should be pinned out through the legs, the ventral surface uppermost, the skin opened up along the middle line from pelvic girdle to symphyses of jaw; separated from the body wall below by means of the handle of a scalpel, and turned back; and then the abdominal wall should be cut into and two flaps pinned back to expose its contents. Note the xiphisternum. The caecum and colon will be recognised (Section 16); the stomach, the right and left central, and left lateral lobes of the liver will probably be apparent; and the urinary bladder (especially if distended) in the middle line behind. Without any further dissection, but simply by turning the parts over, all the structures of the abdomen in Figure 1, Sheet 1, will be identified. Seek especially for and note particularly, the gall bladder, bile duct, and portal vein, pancreatic duct, sacculus rotundus, vermiform appendix, ureters (by pulling urinary bladder forward), genital ducts (looping over ureters), spleen, kidneys, and adrenals. The vena cava inferior is seen dorsally. The genital duct guides the student to the genital gland; if the subject is a male, the testes may be exposed by dissection, or by pulling the vas deferens gently the scrotal sac will be turned inside out, and the testes brought into view. The ovary lies exposed without dissection posterior to the kidney. Examine all this carefully, and make small sketches of points of interest-- the duodenal loop and the pyloric end of the stomach, for instance; the meeting of colon, caecum, and sacculus rotundus again; or the urinary bladder and adjacent parts. Note the dorsal aorta and vena cava and their connexions behind. (Compare figure of circulation.) Cut through pelvic girdle, and rem
PREV.   NEXT  
|<   120   121   122   123   124   125   126   127   128   129   130   131   132   133   134   135   136   137   138   139   140   141   142   143   144  
145   146   147   148   149   >>  



Top keywords:

dissection

 

bladder

 

stomach

 

urinary

 

genital

 

turned

 

testes

 

girdle

 
pelvic
 

exposed


middle
 

animal

 

pinned

 
rotundus
 

ureters

 
sacculus
 
pulling
 

caecum

 

immediately

 

killed


appendix

 

vermiform

 
guides
 

dorsally

 
forward
 

kidneys

 

adrenals

 

spleen

 
looping
 

inferior


portal

 

turning

 

attacks

 

gastric

 

simply

 

consequence

 

Without

 

structures

 
abdomen
 
Figure

identified

 

pancreatic

 

pyloric

 

instance

 

meeting

 

duodenal

 

sketches

 

points

 

interest

 

adjacent