2011 Lab 10 - Fetal

From Embryology
2011 Lab 10: Introduction | Early Embryo | Late Embryo | Fetal | Postnatal | Abnormalities | Online Assessment

Hearing

  • Week 9 - Mesenchyme surrounding membranous labryinth (otic capsule) chondrifies. (More? Human 10 Week Fetus)
  • Week 12-16 - Capsule adjacent to membranous labryinth undegoes vacuolization to form a cavity (perilymphatic space) around membranous labrynth and fills with perilymph.
  • Week 16-24 - Centres of ossification appear in remaining cartilage of otic capsule form petrous portion of temporal bone. Continues to ossify to form mastoid process of temporal bone.
  • 3rd Trimester - Vibration acoustically of maternal abdominal wall induces startle response in fetus.

Central Pathway

Auditory neural pathway
  • 26 weeks - human brainstem auditory pathway is anatomically formed.
  • 28 weeks - Automated Auditory Brainstem Response ( AABR) can be recorded.

less than 34 weeks - latencies of AABR components (I, III, and V) decrease as a function of gestation

References


2011 Lab 10: Introduction | Early Embryo | Late Embryo | Fetal | Postnatal | Abnormalities | Online Assessment

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Cite this page: Hill, M.A. (2019, May 26) Embryology 2011 Lab 10 - Fetal. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/2011_Lab_10_-_Fetal

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© Dr Mark Hill 2019, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G