44 



EXPERIMENTAL PHYSIOLOGY 



this tissue is supporting, the cells or the matrix? Draw a 

 section, under the high power, and label all parts. 



C. Bone, Note the ma- 



>iM 



trix of spongy bone arranged 

 in concentric rings (lamellce) 

 aroimd the central canals 



c. 



(Haversian canals). Be- 

 tween the lamellse note the 

 cap irregular cavities (lacunce) 

 ^ with their wavy branches or 

 canaliculi. Note how these 

 canalicuh connect the la- 

 y.,^^^^.,^.y,^,^^..::ui^^^. .....y. cunsB wlth one another and 



Fig. 17. — Hyaline Cartilage: cav, capsule; 



m, matrix formed by cells; c, cartilage with the HaVCrsian Canals. 



cell; n. nucleus. j^ook in the lacuH^ for the 



bone cells. (In ground sections of bone these will prob- 

 ably be wanting. They appear better in sections of de- 



^-M. 



Fig. 18. — Bone: a, canaliculi; 6, Haversian canal; c, lacuna, 



calcified bone.) Draw, under high power, a section loca- 

 ting all the above named parts. 



