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ANA 113 Lecture 35

Urinary System 2

Location of the ureters extend from the renal pelviis to the bladder (about 10 inches), retroperitoneal
Structure of the ureters mucosa (transitional epithelium, secretes a protective mucous), submucosa layer, muscularis layer (smooth muscle, peristatic waves help move urine, fibrous CT coat)
Location of the urinary bladder posterior to pubic bone and pubic symphysis, anterior to the rectum, inferior to peritoneum
extent of the bladder when empty lies within the pelvic cavity
extent of the bladder when full lies in pelvis and extends into the abdomen, may reach the level of the umbilicus
What is the bladder wall composed of? (4 layers) mucosa, submucosa, muscularis and serosa
Muscosal layer of the bladder innermost layer, contains folds (rugae)which allows the bladder to stretch and expand, lined with transitional epithelium
Submucosal layer of the bladder supports mucosa, contains nerves and blood vessels
Muscularis layer of the bladder smooth muscle and detrusor muscle (found only in the urinary bladder)
What makes up the serosa layer? connective tissue
Function of the bladder storage of urine, contracts to expel urine
Location of the urethra begins at the neck kof the bladder, ends at the urethral orifice
Structure of the female urethra (serves urinary system only) approximately 3 cm long (very short-more likely to get UTI, the urethral orifice is located between the labii minor and anterior to the vaginal orifice
Structure of the male urethra (serves urinary and reproductive system) aprroximately 20 cm long, urethral orifice is located at the end of the penis
Regions of the male urethra prostatic, membranous, penile
Prostatic urethra passes through the prostate, recieves secretions from prostate and ejaculatory duct
Membranous urethra passes through the urogential diaphragm, curves a bit in this area (be careful with a cathetor)
Penile Urethra located within the penis, ends at the urethral orifice
What are the two sphincters for the urethra? internal and external urethral sphincter
Internal urethral sphinctor involuntary, smooth muscle
external urethral sphinctor voluntary, skeletal muscle
Micturation (urination) reflex that epels urine from the urinary bladder. involves a combination of involutary and voluntary responses.
Created by: Kachmiel



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