File:Stage 22 image 223.jpg

From Embryology

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Dorsal Aorta - Human Embryo Carnegie stage 22

This is a cross-section of the dorsal aorta lying anterior to the cartilage of the developing vertebra.

  • Note the developing aorta wall structure including smooth muscle.
  • Note the small arteriole located in the connective tissue surrounding the aorta.
  • Note the large number of nucleated red blood cells in circulation within the embryo.


Links: image dorsal aorta | image RBCs | Cardiovascular System - Blood Development | Carnegie stage 22
Selected Embryo Histology - Week 8 (Stage 22)  
  • Selected Human Embryo Histology - Stage 22 (week 8)
  • developing cortex labeled

    developing cortex labeled

  • central nervous system and ventricles

    central nervous system and ventricles

  • central nervous system and ventricles

    central nervous system and ventricles

  • measured image

    measured image

  • nose and eyes

    nose and eyes

  • eye

    eye

  • optic nerve

    optic nerve

  • lens

    lens

  • lens and pigmented epithelium

    lens and pigmented epithelium

  • lens and pigmented epithelium

    lens and pigmented epithelium

  • head region measured

    head region measured

  • developing cochlea

    developing cochlea

  • pituitary

    pituitary

  • pituitary measured

    pituitary measured

  • pituitary

    pituitary

  • vertebra and spinal cord

    vertebra and spinal cord

  • mesonephric ducts and bladder

    mesonephric ducts and bladder

  • developing testis

    developing testis

  • developing testis labeled

    developing testis labeled

  • developing testis

    developing testis

  • developing testis labeled

    developing testis labeled

  • midgut herniation

    midgut herniation

  • pelvic region - rectum and bladder

    pelvic region - rectum and bladder

  • pelvic region - rectum and bladder labeled

    pelvic region - rectum and bladder labeled

  • pelvic region - rectum

    pelvic region - rectum

  • pelvic region - rectum labeled

    pelvic region - rectum labeled

  • Aorta filled with red blood cells

    Aorta filled with red blood cells

  • Lungs and thymus

    Lungs and thymus

  • Dorsal aorta

    Dorsal aorta

  • Placental blood vessels

    Placental blood vessels

Links: Carnegie stage 22 | Week 8

Image Source: UNSW Embryology, no reproduction without permission.

Cite this page: Hill, M.A. (2026, February 26) Embryology Stage 22 image 223.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Stage_22_image_223.jpg

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© Dr Mark Hill 2026, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G

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