File:Stage 22 image 162.jpg

From Embryology

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Stage 22 image 159.jpg Selected Head Images: B4 - Choroid Plexus | B5 - Cochlea | B6 - Cochlea

Cochlear Region

  • The differentiating wall of the organ of corti.
  • The division of the VIII cranial nerve into a vestibular and auditory (spiral ganglia) component.
  • The eighth cranial nerve (VIII) exiting through the space known as the internal auditory meatus.
  • The cartilage surrounding all these structures that will later ossify to form bone.

internal auditory meatus

  • (internal acoustic meatus, IAM)
  • An anatomical canal in which CN VII and CN VIII ganglia reside and pass through to the brainstem.
  • This bony canal lies between the posterior surface of the petrous pyramid and the bony labyrinth within the dense petrous bone.
  • Also associated clinically with the site where acoustic neuromas may occur.
Links: Inner Ear Development | Skull Development

About Stage 22 Embryo Sections - The Carnegie stage 22 human embryo is 27 mm (CRL) in size and approximately equal to day 54 - 56 of development (week 8). These images have been selected to show some key features of late embryo development.

Links: Carnegie stage 22 - selected serial sections‎‎ | Carnegie stage 22 - serial sections | Carnegie stage 22 | Embryo Serial Sections
Stage 22 image 099 icon.jpg
Stage 22 serial unlabeled images

A1   A2   A3   A4   A5   A6   A7

B1   B2   B3   B4   B5   B6   B7

C1   C2   C3   C4   C5   C6   C7

D1   D2   D3   D4   D5   D6   D7

E1   E2   E3   E4   E5   E6   E7

F1   F2   F3   F4   F5   F6   F7

G1   G2   G3   G4   G5   G6   G7

Stage 22 Serial labeled images

A1L  A2L  A3L  A4L  A5L  A6L  A7L

B1L  B2L  B3L  B4L  B4L  B6L  B7L

C1L  C2L  C3L  C4L  C5L  C6L  C7L

D1L  D2L  D3L  D4L  D5L  D6L  D7L

E1L  E2L  E3L  E4L  E5L  E6L  E7L

F1L  F2L  F3L  F4L  F5L  F6L  F7L

G1L  G2L  G3L  G4L  G5L  G6L  G7L

Cite this page: Hill, M.A. (2024, May 26) Embryology Stage 22 image 162.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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current02:01, 11 August 2010Thumbnail for version as of 02:01, 11 August 20101,000 × 657 (176 KB)S8600021 (talk | contribs){{Template:Stage22selectsections}} {{Template:Footer}} Category:Carnegie Stage 22