GLOSSARY 379 



Gly'co-gen (Gr. glukus, sweet, and -gen, producing) : a substance 

 belonging to the carbohydrates, found in animal tissues, and 

 especially in the liver. It is believed to be deposited as a reserve 

 material in the liver, and is converted into sugar as required. It 

 is sometimes called " animal starch." 



Goi'ter (Fr., from Lat. guitur, throat): a disease which causes an 

 enlargement of the thyroid gland. 



Hair f ol'li-cle (Lat. folliculus, a small bag) : a little pit or depression 

 in the skin, from the bottom of which a hair grows. 



Ha-ver'sian canals (named from Havers, a London anatomist) : small 

 channels in the bones through which the blood vessels ramify. 



He'li-um (Gr. helios, the sun) : a gaseous element identified in the 

 sun's corona (hence the name) long ago, and now proved to exist 

 in the earth's atmosphere, and in certain minerals of our planet. 



Hem-o-glo'bin (Gr. haima, blood, and Lat. globus, a ball) : the coloring 

 matter of the red corpuscles of the blood. 



He-pat'ic (Gr. hepatikos, of the liver) : pertaining in any way to the 

 liver, as the hepatic artery. 



His-to-log'ic-al (Gr. histos, a web, and logia, speech) : pertaining to 

 histology, which is that branch of anatomy concerned with the 

 minute, especially the microscopic, structure of the tissues. 



Hu'me-rus (Lat., the shoulder) : the bone of the upper arm. 



Hy'a-line (Gr. hualos, glass) : resembling glass ; transparent, as hya- 

 line cartilage. 



Hy'dro-gen (Gr. hudor, water, and -gen, producing) : one of the chemi- 

 cal elements ; a very light gas. It unites with oxygen to form 

 water. 



Hy'gi-ene (Gr. hugieia, health) : that department of knowledge which 

 concerns the preservation of health. 



Hy'oid bone (Gr. Y, the letter upsilon, and eidos, form ; from the shape 

 of the bone) : the bone at the root of the tongue. 



Hy-po-gas'tric plexus (Gr. hupogastrion, the lower part of the abdo- 

 men) : a nervous network lying on each side of the rectum. 



Hy-po-glos'sal (Gr. hupo, under, and glossa, tongue) : the twelfth pair 

 of cranial nerves. 



Il-e-o-cae'cal valve (from ileum and ccecum) : the valve at the junction 

 of the small intestine with the large intestine. It prevents the 

 contents of the latter from flowing into the former. 



