part_of starts_at ends_at bladder neck ventral bladder neck anatomical_structure The ventral bladder neck (TS:22-TS:28) is the ventral region of the narrow open end of the bladder, located between the ureter orifices and the opening of the pelvic urethra (the dorsal region of the bladder neck is the bladder trigone). Comprised of urothelium, lamina propria, detrusor muscle and adventitia of ventral bladder neck. EMAPA:36079 TS22 TS28