MUSCLE. 128 
THE MUSCULAR SYSTEM. 
MUSCLE. 
Name the varieties of inflammation found in muscle. 
Suppurative myositis, 
Acute parenchymatous myositis. 
Chronic interstitial myositis. 
Myositis ossificans, 
What are the changes in suppurative myositis ? 
“ The muscle is edematous and hyperemic. The interstitial tissue 
is infiltrated with leucocytes. The exudative products may be so 
abundant that abscesses are formed with the exudation. Degenerative 
changes take place in the muscle fibres, they may become granular or 
undergo fatty or waxy degeneration, 
Describe acute parenchymatous myositis. 
It is a lesion the course of which is unknown. The muscle becomes 
swollen, soft and mottled with yellowish patches and there may be small 
hemorrhages in it. The muscle fibres become degenerated, 
Give the microscopical changes in chronic interstitial myositis. 
It is a productive inflammation with a production of dense new con- 
nective tissue. The muscle fibres atrophy on account of pressure from 
the new tissue. 
What is myositis ossificans ? 
There is a new growth of bony tissue between the muscle fibres 
usually in the form of spicule. The growth may start from the 
periosteum of bone or from interstitial connective tissue. 
Name the degenerative changes common to muscle. 
Simple atrophy. 
Progressive muscular atrophy. 
Atrophia musculorum lipomatosa. 
Fatty degeneration. 
Hyaline degeneration. 
What are the changes in simple atrophy and progressive muscular 
atrophy ? 
In the former the muscle fibres grow narrower than normal as a result 
of pressure due to various causes, and there may be an increased amount 
of connective tissue between the muscle fibres. The datter form is a 
combination of simple atrophy and chronic interstitial myositis. The 
