Table 1.

Caudal cervical ramus ventralis perineural injections on 4 equine cadavers: injection condition allocation (neck side and injection volume), injection site along the nerve course, dye choice, and extent of diffusion.

Cadavers	Ramus Ventralis Left (L) or right (R) side Volume injected	Injection site	Length of nerve staining	Epidural diffusion
Methylene blue dye
Horse 1	C6 L 7 ml	Distal	>2 cm*	No
Horse 1	C7 L 14 ml	Proximal	>2 cm	Yes(+ sub-arachnoid)
Horse 2	C7 L 7 ml	Distal	>2 cm*	No
Horse 2	C8 L 7 ml	Proximal	<2 cm**	Yes
Horse 3	C7 R 7 ml	Proximal	>2 cm	Yes (frozen sections)
Horse 3	C8 R 14 ml	Distal	>2 cm*	Yes (frozen sections)
Permament marking tissue dye
Horse 4	C7 R 14 ml	Proximal	<2 cm**	No
Horse 4	C8 R 7 ml	Distal	>2 cm	No
Horse 4	C7 L 7 ml	Proximal	>2 cm*	Yes
Horse 4	C8 L 14 ml	Distal	>2 cm	No

^*Longitudinal staining of the ramus ventralis from the ventral border of the articular processes to the limit of the brachial plexus.

^**Incomplete transversal staining with more concentrated color on cranial half of the nerve trunk.