52 TISSUES 



articular surfaces of bones, which line joint-cavities; 

 in costal cartilages as found between the ribs and 

 breast bone or sternum; in cartilages surrounding the 

 trachea (windpipe); and in most of the laryngeal 

 cartilages. It may ossify in old age. 



The white fibrocartilage is not very plentiful and acts 

 as a structure to deepen joint-cavities, as interarticular 

 fibrocartilages and intervertebral disks. 



Yellow fibrocartilage is found wherever elasticity is 

 required, as in the epiglottis, Eustachian tube, ear, and 

 smaller laryngeal cartilages. It never ossifies. 



Cartilages are very poorly nourished, as they do not 

 contain many bloodvessels, except in the perichon- 

 drium; and except when the cartilage is developing. 

 No lymph channels are present. 



NOTE. Muscle, osseous, and nerve tissues are de- 

 scribed under the chapters on Muscles, Bones, and 

 Nerves respectively. 



QUESTIONS 



1. What do you understand by the term maturation? Fertiliza- 

 tion? 



2. What three layers of cells are developed from the ovum after 

 maturation and fertilization are completed? 



3. What are the tissues of the body divided into? 



4. Name the functions of epithelial tissue. 



5. In what cavities of the body are epithelial cells found? 



6. Give the classification of epithelial cells. 



7. How do ciliated cells differ from other cells? 



8. What is characteristic of stratified cells? 



9. In which direction do the motion possessed by ciliated cells 

 point? 



10. What layers of tissues enter into the formation of a normal 

 mucous membrane? 



11. Which layer contains bloodvessels, lymphatic spaces, nerves, 

 glands, and lymphoid tissue in certain organs? 



12. Which layer contains involuntary non-striated muscle tissue? 



13. Give the subdivisions of glands. 



14. What are the three varieties of secretions from glands? 



15. How do serous membranes differ from mucous membranes? 



16. What name is given to the type of cells covering the serous 

 membranes? 



17. Where are serous membranes found throughout the body? 



