BIOL 221 Lecture Notes - Lecture 6: Renal Pelvis, Transitional Epithelium, Abdominal Cavity
6 Mar 2020
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Kidney: collecting structures: minor calyces (singular = calyx, major calyces, renal pelvis. Minor calyces are the collecting areas into which the papillary ducts empty their urine. These calyces join to form major calyces, which then join to form the renal pelvis. The renal pelvis empties into the ureter. The renal pelvis narrows to become the ureter, which exits at the hilum (also called the hilus). Transitional epithelium lining the ureter allows stretching as urine enters. The muscularis consists of smooth muscle that contracts in peristaltic waves. Parasympathetic impulses increase activity while sympathetic impulses decrease it. The adventitia of connective tissue anchors the ureter to the posterior wall of the abdominal cavity. Urinary bladder: mucosa, transitional epithelium, lamina propria, muscularis (detrusor muscle, trigone - area between openings of ureters & urethra. The urinary bladder lies in the pelvic cavity. The mucosa is composed of transitional epithelium and a lamina propria of areolar connective tissue.
