File:Spinal cord tracts.png

Spinal Cord Tracts

Motor and sensory tracts of the adult spinal cord.

Human Fetus - Spinal Cord Vestibulospinal Tract Development^[1]

"Species-specific Posture of Human Foetus in Late First Trimester The ontogeny associated with the arm-hanging posture, which is considered ape-specific, remains unknown. To examine its ontogeny, we measured foetal movements of 62 human foetuses aged 10-20 gestation weeks using four-dimensional sonography. We observed that the first-trimester foetuses show this particular species-specific posture. After 11 weeks of gestation, all foetuses showed the arm-hanging posture, and the posture was most frequently observed at 14-16 weeks of gestation. Moreover, this posture often involved extension of both arms and both legs, indicating that it is not myogenic but neurogenic. Furthermore, early ontogeny suggests that it originates because of subcortical activity. Such posture extension bias and persistence indicates that vestibulospinal tract maturation involves the ontogeny of arm-hanging posture during 14-16 weeks of gestation." limb | spinal cord

Reference

Figure - Mikael Häggström 2010

https://commons.wikimedia.org/wiki/File:Spinal_cord_tracts_-_English.svg

Copyright

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Cite this page: Hill, M.A. (2026, October 3) Embryology Spinal cord tracts.png. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Spinal_cord_tracts.png

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