Development of Hearing in Utero

Week 3

May 2, 2013

Otic Placode and Otic Vesicle Form

Week 5

May 16, 2013

Cochlear part of otic vesicle elongates

Week 9

Jun 14, 2013

Mesenchyme surrounding membranous labrynth chondrifies

Weeks 12-16

Jul 5, 2013

Capsule adjacent to membranous labrynth undergoes vacuolization to form a cavity (perilymphatic space) around membranous labrynth and fills with perilymh

2nd Trimester

Aug 3, 2013

Centres of ossification appear in remaining cartilage of otic capsule form petrous portion of temporal bone. This continues to ossify to form mastoud procoss of temporal bone.

3rd Trimester

Dec 1, 2013

Vibration acoustically of maternal abdominal wall induces startle response in infants