Table 2.

Lumbosacral plexus classification and variation in 22 sides of 11 mongrel (mixed breed) hound female dogs

	Genitofemoral nerve origin		Pelvic nerve origin		Pudendal nerve origin		Plexus classification type
	Right side	Left side	Right side	Left side	Right side	Left side	Right side	Left side
Dog 1	_	_	S3, CG1 (Post)	S3, CG1 (Post)	S3 (Post)	S3 (Post)	Post	Post
Dog 2	_	_	L7, S1, S2 (Pre)	S2, S3 (Post)	S3 (Post)	S1, S2 (Pre)	Pre–Post	Pre–Post
Dog 3	_	_	S2, S3 (Post)	S2, S3 (Post)	S2, S3 (Post)	S1, S2 (Pre)	Post	Pre–Post
Dog 4	_	_	L7, S1–3 (Median)	S1–3 (Median)	_	_	Median	Median
Dog 5	L3, L4 (Median)	L3, L4 (Median)	S1–S3 (Median)	S1–3 (Median)	S2, S3 (Post)	S2, S3 (Post)	Median–Post	Median–Post
Dog 6	_	_	S1, S2 (Pre)	S1, S2 (Pre)	S2 (Pre)	S2, S3 (Post)	Pre	Pre–Post
Dog 7	L3, L4 (Median)	L3, L4 (Median)	S2, S3 (Post)	S2, S3 (Post)	S2 (Pre)	S3 (Post)	Pre–Median–Post	Median–Post
Dog 8	L4 (Post)	L4 (Post)	S1–3 (Median)	S1–3 (Median)	S1–3 (Median)	S1–3 (Median)	Median–Post	Median–Post
Dog 9	L4 (Post)	L4 (Post)	S1, S2 (Pre)	L7, S1, S2 (Pre)	S2, S3 (Post)	S2, S3 (Post)	Pre–Post	Pre–Post
Dog 10	L4 (Post)	L4 (Post)	L7, S1, S2 (Pre)	L7, S1, S2 (Pre)	S2, S3 (Post)	S2, S3 (Post)	Pre–Post	Pre–Post
Dog 11	L4 (Post)	L4 (Post)	S2, S3 (Post)	L7, S1, S2 (Pre)	S2, S3 (Post)	L7, S1–3 (Median)	Post	Pre–Median–Post
Summary Classification	33% Median   66% Post		36.3% Pre   27.2% Median   36.3% Post		20% Pre   15% Median   65% Post		4.5% Pre   9% Median   18.1% Post   36.6% Pre–Post   22.7% Median–Post   9% Pre–Median–Post

Pre, pre-fixed; Median, median-fixed; Post, post-fixed type plexus; L, lumbar; S, sacral; CG, coccygeal.

Each spinal nerve ventral rami contributing to the nerves listed were classified (in parenthesis) according to Fletcher’s system (Fletcher, 1970). % frequency is also listed of individual nerves and for the plexus overall.

Retrograde-labelling methods were used to verify L7 contributions.