Specialized venous clefts of the hypophyseal capsule.
D000818:Animals; D002417:Cattle / Q000033:anatomy & histology*; D002426:Cavernous Sinus / Q000033:anatomy & histology; D005260:Female; D008297:Male; D010902:Pituitary Gland / Q000098:blood supply*; D014680:Veins / Q000033:anatomy & histology