Flashcards in Lesson 4B (Part 3) Deck (30)
What is the arterial supply for the testes?
- branches from the abdominal aorta, just below the renal arteries
What is the venous supply for the testes?
- passes into the abdominal cavity
Where does the left testicular vein dump into?
The left renal vein
- then to the IVC
What is venous outflow from the scrotum through?
Where does the pampiniform plexus empty into?
Where does lymph drain through?
Through lymph nodes around the aorta
Where does the nerve supply for the male reproductive system branch from?
The 10th and 11th thoracic nerves
How long is the deferent duct?
45 cm long
Where does the deferent duct pass through?
Upwards from the testis through the inguinal canal
Where does the deferent duct ascends medially towards?
The posterior wall of the bladder
What does the deferent duct join with to form the ejaculatory duct?
The seminal vesicle
What are the seminal vesicles composed of?
Two small fibromuscular pouches lined with columnar epithelium
Where are the seminal vesicles located?
Lying on the posterior aspect of the bladder
What does the seminal vesicles do?
Contract and expel their stored contents, seminal fluid, during ejaculation
What % does seminal fluid make up of the fluid ejaculated at the male orgasm?
What does seminal fluid contain?
Nutrients to support the sperm
How many ejaculatory ducts are there?
- about 2 cm long
Where does the ejaculatory duct pass through?
The prostate gland
What does the ejaculatory duct join up with after it passes through the prostate gland?
- carrying seminal fluid and spermatozoa to the urethra
What are the ejaculatory ducts composed of?
The same layers of tissue as the seminal vesicles
What are the main components of the male reproductive system that you can see on US? (5)
3. Pampiniform plexus
4. Spermatic cord
What is US used for on the male reproductive system? (11)
1. Causes for pain
5. Undescended testis
6.Reduced Sperm count
- orchitis and prostatitis
10. Polycystic kidney disease
Why is it important to use warm gel when doing a scrotal exam?
Because by using cold gel it may cause the skin on the scrotum to contract and become thick or may cause the testicles to ascend in the scrotal sac making imaging more difficult
What is the most common reason for testicular trauma? (2)
1. Biking accidents
2. Men who play sports and dont wear jocks
What should be performed when evaluating for varicoceles or hernieas? (2)
1. Valsalva manoeuver
2. Scanning in the upright position
How does the testes appear on US? (2)
1. Visceral and parietal layers of the tunica
- one echogenic stripe
How does the epididymis appear on US?
Similar or slightly increased echogenicity as compared to the normal testis
How does the mediastinum testis appear on US?
Linear echogenic band running craniocaudally or parallel to the epididymis
How does the appendix testis and appendix epididymis appear on US?
Small ovoid hyperechoic protuberances found at the superior pole of the testis
- normally hidden by the epididymal head
- unless outlined by fluid from a hydrocele, they are difficult to find on ultrasound