File:Stage 22 image 219.jpg

From Embryology

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Human Embryo Head Region (Week 8, Carnegie Stage 22)

Section through the Week 8 human embryo oral cavity, skull, auditory and neural components. Superimposed measurements of different structures within the stage 22 embryo head. Compare these sizes with those seen in the feral, newborn and adult head.

  • Oral cavity - midline tongue, unfused palatal shelves.
  • Skull - temporal bone still present as cartilage template and not yet ossified.
  • Auditory - external, middle and inner ear components. Note undifferentiated cochlear.
  • Neural - cranial nerve 8 (CNVIII), brain stem region, ventricular space and choroid plexuses.

temporal cartilage, middle and inner ear and brain stem.

Links: full image cochlea | Inner Ear Development | Carnegie stage 22
Selected Embryo Histology - Week 8 (Stage 22)  
Links: Carnegie stage 22 | Week 8

Image Source: UNSW Embryology, no reproduction without permission.

Cite this page: Hill, M.A. (2024, April 24) Embryology Stage 22 image 219.jpg. Retrieved from

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© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G

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