Male Anatomy Flashcards
erectile tissues making up penis
corpus spongiosum (corpus cavernosum urethra) 2 corpora cavernosa
corpus spongiosum
“corpus cavernosum urethra”
along midline
- contains urethra as it pierces UG diaphragm - known as spongy penile urethra
- enlarges at distal end to form glans penis
- has limited erectile function
corpora cavernosa
two that form the crura of the penis
arise from ischiopubic rami adjactent to UG diaphragm
tunica albuginae
“white coat”
- CT that invests each erectile body seperately
fundiform ligament
- thickening of scarpa’s fascia
- inserts into superficial fascia Colle’s fascia of penis
- forms anterior support of penis: more superficial layer
suspensory ligament of penis
- deep fascial layer that hangs from pubic symphysis
- arises from lower end of linea alba
- inserts onto Buck’s fascia of penis
bulbospongiosus muscle
covers bulb of penis
“compressor of the urethrae” - when it contracts, it constricts the urethra allowing for propulsion of sperm during ejactulation
- seperated from corpus spongiosum via Buck’s fascia
ischiovacernosus m.
covers wings of corpus cavernosum, contraction pulls penis into erect position
“erector of penis”
- seperated from corpora cavernosa via Buck’s fascia
superficial transverse perineal muscle
- borders the posterior edge of the UG diaphragm
- originates from ischiopubic rami
- inserts on central tendon of the perineum
tunica vaginalis
serous covering of testes
derived from processus vaginalis
tunica albuginae in testes
dense CT that divides the organ into lobules
- each lobule contains: convoluted seminiferous tubule, straight ST, and rete testis
- lobules come together in mediastinal area
epidiymis
- place where sperm gain motility
- divided into head, body/tail and caudal portion
Layers of testes
- deepest: visceral layer of tunica vaginalis
- internal spermatic fascia
- cremasteric m and fascia
- external spermatic fascia
- Dartos
- external: skin
epididymis
where sperm gain motility
- head: individual lobules and a single uniting duct
- body/tail: epididymil duct
- caudal portion: leads into ductus deferens
ductus deferens
- continuation of epididymal duct
- passes through the inguinal canal to enter the pelvis
- converges with opposite duct posterior to the bladder
- strong muscular body, functions in ejactulation
ejaculatory duct
constriction of ductus deferens as duct enters prostate gland
seminal vesicles
- arise from blind pouches from the ductus deferens
- functionally these are sex glands (secrete alkaline fluid to add to the semen)
ejaculatory ducts
starts at the junction with the seminal vesicle
- courses through the prostate to prostatic urethra
prostate gland
- located between levatory ani m. and base of bladder
- adult structure has two lobes:
1. middle: above the ejactulatory duct
2. posterior: below the ejaculatory duct
prostatic urethra
extends from neck of bladder to membranous urethra
- prostate opens into urethra along two lateral grooves known as prostatic sinuses
Blood supply to testis/epididymis?
testicular artery and vein - pampiniform plexus
blood supply to ducutus deferens?
deferential a. and v. back to base of bladder
blood supply to prostate?
inferior vesicle a. (and maybe middle rectal or internal iliac a)
two sets of aa:
- capsular branches: supply main portion of gland
- urethral a. supplies prostatic urethra and adjacent tissue
two sets of vv:
- prostatic plexus drains anterior lateral portion of gland
- vesical plexus drains to base of bladder
