Accessory process
Processus accessorius
Definition
The accessory process is a bony outgrowth extending from the vertebral pedicle. It serves as a ligament and muscle attachment.
Not present on all vertebrae, it is found on certain thoracic vertebrae (mainly the last ones) between the transverse process and the caudal articular process. It is also present on the lumbar vertebrae, where it is well developed and located near the caudal articular processes.
Variation :
In dogs and cats, it is present from the eleventh to the thirteenth thoracic vertebra, as well as on all lumbar vertebrae.
References
Barone R. Anatomie comparée des mammifères domestiques, Tome 1, Ostéologie, 5th edition, Vigot, Paris, 2017.
Constantinescu GM, Schaller O. Illustrated veterinary anatomical nomenclature, 3rd Edition, Enke Verlag, Stuttgart, 2012.
