Male And Female External Genitalia And Pelvic Organs Flashcards
Inguinal canal
oblique passageway through the muscles of the anterior abdominal wall that lies superior to the medial half of the inguinal ligament
Passes through each layer of the abdominal wall as it travels medially and inferiorly
Length of inguinal canal
5cm
Inguinal canal location
Extends from deep inguinal ring laterally to superficial inguinal ring medially
Deep inguinal ring
Aperture in transversalis fascia
Superficial inguinal ring
Aperture in external oblique aponeurosis
Anterior border of inguinal canal
External oblique aponeurosis
Internal oblique aponeurosis laterally
Posterior border of inguinal canal
Transversalis fascia
Medial fibres of the aponeuroses of the internal oblique and transversus abdominis (conjoint tendon) medially
Roof of inguinal canal
Transversalis fascia
Arching fibres of the internal oblique and transversus abdominis
Floor of inguinal canal
Inguinal ligament (the lower border of the external oblique aponeurosis)
Conjoint tendon
Medial fibres of the aponeurosis of the internal oblique and transversus abdominis
3 structures of inguinal canal in females
Round ligament of uterus
Ilioinguinal nerve
Genital branch of the genitofemoral nerve
Contents of inguinal canal in males
Contained within spermatic cord except the ilioinguinal nerve
2 nerves of spermatic cord
Genital branch of genitofemoral nerve
Sympathetic nerve fibres
Contents of spermatic cord
2 nerves
3 arteries
3 fascial layers
4 other structures
3 arteries in spermatic cord
Testicular artery
Cremasteric artery
Artery to vas deferens
3 fascial layers in spermatic cord
External spermatic fascia
Cremaster muscle and fascia
Internal spermatic fascia
The external spermatic fascia is derived from
External oblique aponeurosis
The cremaster muscle and fascia is derived from
Internal oblique muscle
The internal spermatic fascia is derived from
Transversalis fascia
4 other structures of the spermatic cord
Pampiniform venous plexus
Lymphatics
Vas deferens
Processus vaginalis
What is the processus vaginalis derived from
Peritoneum
Where are the testes located
Within the scrotum
Scrotal skin
Thin
Wrinkled
More darkly pigmented than skin elsewhere
Layers of scrotum
Scrotal skin
Thin layer of superficial fascia
Dartos muscle
Dartos muscle
Thin involuntary muscle in scrotum
Superficial fascia in scrotum
Extends between the testes to form a septum, dividing the scrotum into left and right halves
What divides the scrotum into 2
Superficial fascia
What does each half of the scrotum contain
Testis
Epididymis
Distal part of spermatic cord
Function of testes
Produced sperm
Secrete testosterone
Structure of testes
Ovoid structures
Covered by 3 same layer of spermatic fascia that cover the spermatic cord (external spermatic fascia, cremaster fascia, internal spermatic fascia)
Also surrounded by a sac called the tunica vaginalis
Tunica vaginalis
Sac derived from peritoneum around testes
Structure of epididymis
Coiled tube lying along the posterior border of each testis
Expanded head superiorly
A body and pointed tail lying at the lower like of the testis
Function of epididymis
Store spermatozoa
Function of vas deferens
Carries sperm from the epididymis and travels with the testicular vessels in the spermatic cord
Testicular arteries
Direct branches of abdominal artery
Venous drainage of testis and epididymis
Enters the pampiniform venous plexus
Pampiniform venous plexus
Forms the testicular vein
The right testicular veins drains into
Inferior vena cava
The left testicular veins drains into
Left renal vein
3 cylinders of erectile tissue in penis
2 corpora cavernosa dorsally
1 corpus spongiosum ventrally
Location of corpora cavernosa
Dorsally on penis (top)
Location of corpus spongiosum in penis
Ventrally (bottom)
Buck’s fascia
A deep fascia of the penis which encloses the corpora cavernosa and corpus spongiosum
Glans
End of the penis
Expansion of the corpus spongiosum
Corona
Circular base of the glans
Foreskin
Skin of the shaft of the penis which extends over the glans
Circumcision
Removal of the foreskin due to religious, social or medical reasons
Name of end of penis
Glans
Corpora cavernosa location
Symmetrical and originate along the left and right ischial rami to converge in the midline
Distally- contribute to body of the oenis
Crura
Parts of the corpora cavernosa that are attached to the ischial rami
Corpus spongiosum location
Sits in the midline
Extended part proximally which rests in the perineal membrane (bulb of the penis)
The bulb of the penis
The name of the part of the corpus spongiosum that is attached to the perineal membrane
Where is the penile urethra
Within the corpus spongiosum
Opening of penile urethra
External urethral meatus
Function of penile urethra
Carries semen and urine
What muscles cover the corpora cavernosa
Ischiocavernosus muscles
What muscles cover the corpus spongiosum
Bulbospongiosus muscle
Function of ischiocavernosus muscle
Forces blood into the body if the penis from the crura
Function of bulbospongiosus muscle
Forces blood into the glans penis
Assists in maintaining erection by compressing the veins that drain erectile tissue
Contracts to squeeze any remaining urine or semen from the urethra
Arterial supply to penis
Internal pudendal arteries branches - deep artery of the penis and artery of the bulb of the penis
What are the internal pudendal arteries a branch of
Internal iliac arteries
Nerve root supply to penis
S2-S4
General sensation and sympathetic innervation to penis
Dorsal nerve of penis — branch of pudendal nerve
Parasympathetic innervation of penis
Peri-prostatic nerve plexus
Erection mechanism
Parasympathetic nerve fibres from the peri-prostatic nerve plexus dilate the arteries of the corpora so it becomes engorged with blood
Which nerve innervates the ischiocavernosus and bulbospongiosus muscles
Pudendal nerve (S2-S4)
Parts of the penis
Shaft
Corona
Glans
What is responsible for increased size and rigidity during an erection
Corpora cavernosa
Role of corpus spongiosum during erection
Engorged with blood to a lesser extent
Prevent urethra from being compressed - would prevent ejaculation
Male pelvic organs
Intra-abdominal parts of the paired vasa deferentia
Seminal vesicles
Ejaculatory ducts
Bulbo-urethral glands
Bladder
Rectum