The pterygoideus proprius muscle.
An anomalous muscle was found in the infratemporal fossa of a male cadaver of advanced age. This formation passed between fixed bony attachments at the infratemporal crest (greater wing of the sphenoid) and the inferior part of the lateral pterygoid plate. The muscle was not atrophied but functional significance was not clear.
D006801:Humans; D008410:Masticatory Muscles / Q000002:abnormalities*; D011626:Pterygoid Muscles / Q000002:abnormalities*; D013100:Sphenoid Bone / Q000002:abnormalities