What is the trigone in anatomy?
Anatomical terminology. The trigone (a.k.a. vesical trigone) is a smooth triangular region of the internal urinary bladder formed by the two ureteric orifices and the internal urethral orifice. The area is very sensitive to expansion and once stretched to a certain degree, the urinary bladder signals the brain of its need to empty.
What is the difference between the internal and trigone bladder?
In contrast to the rest of the internal bladder, the trigone has smooth walls (this is explained by the different embryological origin: the trigone is developed by the integration of two mesonephric ducts at the base of the bladder). Fig 2 – Anatomical features of the bladder.
What is carotid trigone and olfactory trigone?
carotid trigone the triangular area bounded by the posterior belly of the digastric muscle, the sternocleidomastoid muscle, and the anterior midline of the neck. Called also superior carotid triangle. olfactory trigone the triangular area of gray matter between the roots of the olfactory tract. vesical trigone trigone of bladder.
What is trigonitis of the bladder?
The trigone is the neck of the bladder. It’s a triangular piece of tissue located in the lower part of your bladder. It’s near the opening of your urethra, the duct that carries urine from your bladder outside of your body. When this area becomes inflamed, it’s known as trigonitis.
Is the trigone of the bladder a muscle?
The upper and lower urinary tract compartments form independently, connecting at mid-gestation when the ureters move from their primary insertion site in the Wolffian ducts to the trigone, a muscular structure comprising the bladder floor just above the urethra.
What type of tissue is the trigone?
In all other regions, the outer layer is fibrous connective tissue. There is a triangular area, called the trigone, formed by three openings in the floor of the urinary bladder.
What is the trigone made of?
The trigone (a.k.a. vesical trigone) is a smooth triangular region of the internal urinary bladder formed by the two ureteric orifices and the internal urethral orifice.
What is the trigone of the bladder?
Trigone. The trigone is a triangular portion of the bladder floor bordered (ventrally) by the internal urethral opening or bladder neck and (dorsolaterally) by the orifices of the right ureter and left ureter.
Is the bladder a muscle?
The wall of the bladder is comprised of smooth muscle fibers oriented in multiple different directions. These smooth muscle fibers are collectively known as the detrusor muscle. This interwoven orientation provides the bladder with the ability to stretch in response to the presence of urine.
Is the bladder A organ or muscle?
The bladder is a subperitoneal, hollow muscular organ that acts as a reservoir for urine. The bladder is located in the lesser pelvis when empty and extends into the abdominal cavity when full. In children, the bladder is located in the abdomen and does not completely descend into the pelvis until puberty.
What is the trigone quizlet?
The trigone is the triangular area made up of the openings from the ureters and the opening into the urethra.
What is the purpose of trigone?
The trigone is a triangular region located at the bladder base just above the bladder neck. Its functions include preventing urine reflux and signaling the need for voiding [157] .
Do men have trigone?
The trigone is the least mobile aspect of the bladder as it is fused with the underlying detrusor that comprises the rest of the bladder [31]. In males, the bladder neck is contiguous with the prostatic urethra [7].
What muscle contracts the bladder?
The detrusor smooth muscle is the main muscle component of the urinary bladder wall. Its ability to contract over a large length interval and to relax determines the bladder function during filling and micturition.
Where does trigone develop from?
In the classic view of bladder development, the trigone originates from the mesoderm-derived Wolffian ducts while the remainder of the bladder originates from the endoderm-derived urogenital sinus.
What kind of muscle tissue is found surrounding the urinary bladder?
An outer layer of smooth muscle called the detrusor muscle surrounds the bladder.
What is CFT in medical terms?
It uses a cystoscope or a urethroscope to cauterize — or burn — inflamed tissue. CFT works under the theory that as damaged tissue dies, it’s replaced by healthy tissue. In one study, 76 percent of women undergoing CFT had resolution of their trigonitis.
How many people have trigonitis?
The majority of people with trigonitis are women of childbearing age as well as men undergoing hormone therapy for things like prostate cancer. According to research, pseudomembranous trigonitis occurs in 40 percent of adult women — but fewer than 5 percent of men.
What is it called when the trigone is inflamed?
When this area becomes inflamed, it’s known as trigonitis. However, trigonitis isn’t always the result of inflammation. Sometimes it’s due to benign cellular changes in the trigone. Medically, these changes are called nonkeratinizing squamous metaplasia. This results in a condition called pseudomembranous trigonitis.
What are the symptoms of trigonitis?
They include: an urgent need to urinate. pelvic pain or pressure. difficulty urinating. pain during urination. blood in the urine.
Where is trigonitis seen?
While they share some of the same symptoms, trigonitis differs from IC in several ways: The inflammation that occurs with trigonitis is only seen in the trigone region of the bladder. IC can cause inflammation throughout the bladder.
Where does IC pain come from?
IC can cause inflammation throughout the bladder. Pain from trigonitis is felt deep into the pelvis, radiating to the urethra. IC is generally felt in the lower abdomen. According to research published in the African Journal of Urology, trigonitis is more likely than IC to produce pain upon passing urine.
What is a catheter used for?
Some common ones are: Long-term use of a catheter. A catheter is a hollow tube inserted into your bladder to drain urine. It’s often used after surgery, after spinal injuries, or when nerves in your bladder that signal emptying are injured or misfiring.
What is the trigonometric area of the neck called?
Called also vesical trigone. carotid trigone the triangular area bounded by the posterior belly of the digastric muscle, the sternocleidomastoid muscle, and the anterior midline of the neck. Called also superior carotid triangle. olfactory trigone the triangular area of gray matter between the roots of the olfactory tract.
What is a trigone?
trigone. [ tri´gōn] 1. triangle. 2. the first three cusps of an upper molar tooth. adj., adj trigo´nal. trigone of bladder a triangular region of the wall of the urinary bladder, an area in which the muscle fibers are closely adherent to the mucosa; its three angles correspond with the orifices of the ureters and urethra.
What are the three cusps of a tooth?
The first three dominant cusps (protocone, paracone, and metacone), taken collectively, of an upper molar tooth. [L. trigonum, fr. G. trigōnon, triangle] Medical Dictionary for the Health Professions and Nursing © Farlex 2012.
Which muscle is associated with the trigone?
The small triangular area is covered laterally by the buccal mucosa and medially by the anterior tonsillar pillar. The buccinator muscle anteriolaterally and masseter muscle on the posteriolateral side are the anatomic muscle relationships of the Trigone.
What is a retromolar trigone?
Retromolar Trigone (rTR) is the Gingiva or mucosa covering the alveolar ridge posterior to the last Mandibular molar overlying the ramus of the mandible and is defined as a Roughly triangular space.
Why is the mucosa of the retromolar trigone rigid?
The mucosa covering the Retromolar Trigone is rigid as it is tightly adherent to the underlying alveolar bone. This is what is said to help malignant tumors infiltrate the mandible in a short period if time in the early stages. The rTR is known as the anatomic crossroad where muscular and nervous components converge.
What is the most common cancer of the retromolar trigone?
Cancer of Retromolar Trigone: Most common type of Cancer seen is the Squamous cell carcinoma in different grades of differentiation. The tumours of the rTR are mucosal neoplasms of gums and cheek which constitute almost 12% of the oral tumors. The other types of less commonly used cancers involving rTR are – mucoepidermoid carcinoma, ...
Which nerve is involved in cancer of the retromolar trigone?
The Lingual nerve is also positioned behind the Retromoalr trigone and medially placed which is the reason why the Lingual nerve involvement is seen in Cancers of Retromolar Trigone. As it shares the borders with many vital structures like the tonsils, tongue, floor of mouth and soft palate, in case of any cancer involving Retromolar Trigone all ...
Shape of the Bladder
The appearance of the bladder varies depending on the amount of urine stored. When full, it exhibits an oval shape, and when empty it is flattened by the overlying bowel.
Vasculature
The vasculature of the bladder is primarily derived from the internal iliac vessels.
Lymphatics
The superolateral aspect of the bladder drains into the external iliac lymph nodes. The neck and fundus drain into the internal iliac, sacral and common iliac nodes.
Nervous Supply
Neurological control is complex, with the bladder receiving input from both the autonomic (sympathetic and parasympathetic) and somatic arms of the nervous system:
Clinical Relevance: Spinal Cord Injuries and the Bladder
The bladder has important clinical considerations when it comes to spinal cord lesions. There are two different clinical syndromes, depending on where the damage has occurred.
Clinical Relevance: Urine Retention
Besides neurogenic dysfunction of the bladder, normal bladder emptying may be hampered by any form of obstruction, from the level of the bladder neck downwards. In males, the most common cause is obstruction due to prostate enlargement (BPH). Other causes include obstruction by a stone or large blood clot.
