Jaw abnormality sagittally divides the face into five equal parts: It is insufficient to derive at a diagnosis of jaw deformity solely based on the clinical examination. Hence, additional information is gathered from diagnostic tests, which may include dental model analyses and radiographic imaging studies. Mandibular micrognathia is the condition when lower jaw is smaller than normal. Failure of the ramus to develop will give rise to micrognathia.<ref name="Elsevier/Churchill Livingstone"></ref> Micrognathia can be classified as either congenital or acquired. Clinical appearance of some patients with congenital type of mandibular micrognathia can have a severe retrusion of the chin but by actual measurements,
HMCS Moose Jaw took place between December 1943 and March 1944 at Liverpool, Nova Scotia. During this refit, her fo'c'sle was extended. After arriving at Halifax, she was assigned to Newfoundland Command in August 1941. On the 5 September 1941, she sailed with on exercises. En route, they were ordered to reinforce the escort group protecting convoy SC 42. On 10 September 1941, "Moose Jaw" along with "Chambly" sank by depth charges and ramming in the Denmark Strait south of Tasiilaq, Greenland. On the 11 September 1941 "Moose Jaw" and rescued 41 survivors from the British merchant ship "Berury", which had been torpedoed