Cav1 is a family of calcium channels of the L-type that are involved in many basic signalling processes in brain and muscle. Cav1's are not classic cannabinoid receptors but their activity is modulated by cannabinoids. Since cannabinoids have a physiological effect on Cav1's they are effectively cannabinoid receptors.

Chemical Name: 
Cav1.x, L type calcium channel
IUPHAR entry: 
Wikipedia entry: 
Distribution: 

Basal ganglia (caudate nucleus, pallidum > putamen), cerebral cortex, hippocampus, substantia nigra, spinal cord. Cerebrum, cerebellum, spinal cord, dorsal root ganglia, lung, small intestine, testis. Skeletal muscle (predominantly transverse tubules) > bone marrow.

Endocannabinoids: 
Literature Discussion: 

2AG  

References:

Pertwee, R.G., Howlett, A.C., Abood, M.E., Alexander, S.P.H., Di Marzo, V., Elphick, M.R., Greasley, P.J., Hansen, H.S., Kunos, G., Mackie, K., et al. (2010). International Union of Basic and Clinical Pharmacology. LXXIX. cannabinoid receptors and their ligands: beyond CB₁ and CB₂. Pharmacol. Rev. 62, 588–631.