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sound pathways through human body

I am facing a problem of sound perception, which I cannot answer with
accuracy: when a little sound source in the audible range (~1kHz) is located
inside a human body, within the fat cells (for example, a buzzer fixed on a
medical device) which of the acoustic pathway from the transducer to the
inner ear is occurring ? 
The sound source is, or should be, implanted inside the abdomen, elastically
fixed to the nearest bones (ie the lowest part of the spinal column, maybe
even the pelvis).
The question is: is sound (@ 1kHz) transmitted:
- through bones
- through fluid (fat, air, water ...) directly to the internal ears,
- through fluids, interface with air, and then external ears?
If possible, could you provide me a reference list?
Thanks in advance, best regards,

Dr. Hervé Lissek
Head of the acoustic group
ELB 040 
Station 11
CH-1015 Lausanne
Tel: +41 21 693 46 30
Fax: +41 21 693 26 73