Palmar longitudinal groove
Sulcus longitudinalis palmaris
Definition
In bulls, the palmar surface (Facies palmaris) of the cannon bone of the forepaw, has a weaker palmar longitudinal groove (Sulcus longitudinalis palmaris/plantaris) that also goes from one metacarpal canal to the other.
References
Anatomie comparée des mammifère domestiques - 5th edition - Robert Barone - Vigot