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Abstract
The time of appearance and subsequent morphogenetic development of the tensor tympani and stapedius muscles in man were investigated in human embryos and foetuses (from 14 to 220 mm C.R. length). It was found that the primordia of both muscles form approximately at the end of the second month of intra-uterine life. The primordium of the tensor tympani muscle is situated laterally to the dilated extremity of the tubotympanic recess. The primordium of the stapedius muscle lies next to the facial nerve and stapedial artery. Differentiation of the muscle fibres occurs earlier in the tensor tympani muscle than in the stapedius muscle. The development of the middle ear muscles parallels that of the various structures of the middle ear with which they are in contact.
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