Extensor digitorum I and II
Musculus extensor digitorum I et II
Definition
Origin: Craniolateral border of the ulna.
Insertion: Digits I and II.
Function: Extends digits I and II, and adducts digit I.
Description:
The extensor muscle of the first and second digits (Extensor digitorum I and II) is present as a separate muscle in carnivores only.
In the other domestic mammals it is fused to the common digital extensor muscle.
In the horse, the Thierness muscle is thought to be the remnant of this muscle.
References
König, H. E., & Liebich, H. (2020). Veterinary anatomy of domestic animals: Textbook and Colour Atlas. Thieme.
