URETHRA Flashcards
drains urine from the bladder and conveys it out of the body
Urethra
Componets of Urethra
- Smooth m
- Inner Mucosa
Epithelium Lining of the Urethra
* Proximal:
* Middle:
* Distal:
- Proximal: Transitional Epithelia
- Middle: Stratified & Pseudostratified Columnar Epithelium
- Distal: Stratified Squamous
Sphincter located at the bladder–urethral junction
* Type
* Function
Internal Urethral Sphincter
* Type: Involuntary SM
* Function: Keeps the urethra closed when urine is not being passed
Sphincter that surrounds the urethra within the urogenital diaphragm
* type:
* Function:
External Urethral Sphincter
* Type: Skeletal Muscle
* Function: Inhibit urination voluntarily until the proper time
External Urethral Sphincter surrounds the urethra within the —
urogenital diaphragm
Internal Urethral Sphincter is located at the —
bladder–urethral junction
muscle that voluntarily constricts the urethra that’s located on the pelvic floor
Levator Ani muscles
What epithelia is sparse in female urethra
Stratified and Pseudostratified Columnar Epithelia
Length of the:
* Female Urethra
* Male Urethra
- Female Urethra: 3 - 4 cm or 1.5 inch
- Male Urethra: 20 cm or 8 inches
The female urethra is bound to the __
Anterior Wall of the vagina
The female urethra opens externally @ the ___
* location of the opening
External Urethral Orifice
* anterior to the vaginal opening and posterior to the clitoris
3 regions of the male urethra
- Prostatic Urethra
- Membranous Urethra
- Spongy Urethra
Region of the urethra that is the most dilatable
* Hugged by which structure
Prostatic Urethra
* Prostate Gland
Least dilatable region of the urethra
* passes through the __
Membranous Urethra
* Passes through the Urogenital Diaphragm
longest region of the male urethra
* passes through the –
* opens to the
Spongy Urethra
* Passes through the Penis
* Opens to the External Urethral Orifice
Narrowest area of the male spongy urethra
External Urethral Orifice
Narrowest area of the male spongy urethra
External Urethral Orifice
Enumerate the process of micturation
- Bladder Stretches => Visceral Afferent impulses are transmitted to the Spinal Cord => Pontine Micturation Center => Micturation Response
- PSNS Efferents causes Detrusor m. to contract and Internal Urethral Sphincter to open
- SNS Efferents are inhibited
- Somatic Motor Efferents are inhibited => External US Relaxes => Urine Passes
When is the control of External Urethral Sphinter attained
Once the nervous system of a child matures
What happens to the kidneys as we age?
- Kidneys shrink
- Nephrons decrease in size and number
- Tubules become less efficient in reabsorption
What condition usually affects the kidney’s ability to filtrate blood?
Atherosclerosis
