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'''Lumpy jaw''' is a chronic infectious condition which affects cattle. It is caused by the anaerobic filamentous bacteria [[Actinomyces bovis|''Actinomyces bovis'']]
'''Lumpy jaw''' is a chronic infectious condition which affects cattle. It is caused by the anaerobic filamentous bacteria [[Actinomyces bovis|''Actinomyces bovis'']]
Actinomyces is a normal commensal of the oral cavity, upper respiratory tract and digestive tract of cattle, it gains entry to underlying soft tissue when the mucosa is damaged by trauma or eruption of teeth.
Actinomyces is a normal commensal of the oral cavity, upper respiratory tract and digestive tract of cattle, it gains entry to underlying soft tissue when the mucosa is damaged by trauma or eruption of teeth. It causes an inflammatory reaction, the connective tissue proliferates and is followed by infiltration of leukocytes which results in a walled off granuloma. The granuloma invades the bones of the head, in particular the mandible, and continues to grow in size.
Lesions are charcterised by gross swelling, abscesses and draining fistulae overlying granulation of the madible and maxila. In some cases the [[Oesophagus - Anatomy & Physiology|oesophagus]] and [[Oesophageal groove|oesophageal groove]] may become involoved but the lymph nodes not affected.
Lesions are charcterised by gross swelling, abscesses and draining fistulae overlying granulation of the madible and maxila. In some cases the [[Oesophagus - Anatomy & Physiology|oesophagus]] and [[Oesophageal groove|oesophageal groove]] may become involoved but the lymph nodes not affected.
===Pathology===
===Pathology===
Osteomyelitis of the bones of the head with surrounding granulomatous tissue and fistulae draining pus containing small yellow granules.
==Treatment==
==Treatment==