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Synapsids and evolution.

Hopson, J A.

Science ; 219(4580): 49-50, 1983 Jan 07.

Article in English | MEDLINE | ID: mdl-17734326

Dentary-squamosal joint and the origin of mammals.

Barghusen, H R; Hopson, J A.

Science ; 168(3931): 573-5, 1970 May 01.

Article in English | MEDLINE | ID: mdl-5436589

ABSTRACT

The dentary-squamosal jaw joint evolved more than once in advanced cynodont therapsids or their descendants, probably as a buttress against the reaction force created at the articulation by the adductor jaw musculature. The multiple origin of this joint suggests that additional criteria are required to separate early mammals from advanced therapsids.

Subject(s)

Biological Evolution , Jaw , Paleodontology , Animals , Mammals

Acute respiratory infections in aircrew under training with special reference to influenza and adenovirus infections.

McCracken, A W; Hopson, J A.

Mil Med ; 134(2): 111-5, 1969 Feb.

Article in English | MEDLINE | ID: mdl-4303290

Subject(s)

Adenoviridae Infections/epidemiology , Aerospace Medicine , Influenza, Human/epidemiology , Respiratory Tract Infections/epidemiology , England , Humans , Male

R.A.F. medicine--the first 50 years.

Hopson, J A.

Br Med J ; 4(5622): 48-51, 1968 Oct 05.

Article in English | MEDLINE | ID: mdl-4877880

Subject(s)

Aerospace Medicine/history , Aircraft/history , Ambulances/history , History, 20th Century , Military Nursing/history , Military Personnel , Rehabilitation Centers , United Kingdom

The origin of the mammalian middle ear.

Hopson, J A.

Am Zool ; 6(3): 437-50, 1966 Aug.

Article in English | MEDLINE | ID: mdl-5949353

Subject(s)

Biological Evolution , Ear, Middle/embryology , Mammals/growth & development , Reptiles/growth & development , Animals

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