Dentin composes most of the root, which normally has pulp canals. The roots of teeth may be single in number (single-rooted teeth) or multiple. Canines and most premolars, except for maxillary first premolars, usually have one root. Maxillary first premolars and mandibular molars usually have two roots.
Ureter. The ureter is a tube that carries urine from the kidney to the urinary bladder. There are two ureters, one attached to each kidney. The upper half of the ureter is located in the abdomen and the lower half is located in the pelvic area.The ureter is about 10 to 12 inches long in the average adult.The tube has thick walls composed of a fibrous, a muscular, and a mucus coat, which are able to contract. Ureter disorders include:he upper half of the ureter is located in the abdomen and the lower half is located in the pelvic area. The ureter is about 10 to 12 inches long in the average adult. The tube has thick walls composed of a fibrous, a muscular, and a mucus coat, which are able to contract. Ureter disorders include:
Ureters are the two funnel-shaped tubes that carry urine from the kidneys to the bladder. A ureter that does not connect properly to the bladder and drains somewhere outside of the bladder is called an ectopic ureter.In boys the ectopic ureter usually drains into the urethra closer to the prostate.ctopic Ureter. Ureters are the two funnel-shaped tubes that carry urine from the kidneys to the bladder. A ureter that does not connect properly to the bladder and drains somewhere outside of the bladder is called an ectopic ureter. In boys the ectopic ureter usually drains into the urethra closer to the prostate.