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Ovaries
each ovary lies on the lateral wall of the pelvis posterior and inferior to the uterine tube and suspended from the back of the broad ligament by the mesovarium.
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Suspensory ligament of the ovary
contains the ovarian vessels and nerves
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ligament of the ovary
fibromuscular cord that attaches the ovary to the angle between uterus and uterine tube
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Uterine tube
lies in the upper part of the broad ligament surrounded by the mesosalpinx. Runs laterally and backward from the uterus to the side of the pelvis and here curves medially over the ovary.
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Fimbriae and infundibulum
funnel the ovum into the ampulla where it is fertilized by the waiting sperm.
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Where does developing embryo travel?
Developing embryo then travels through the isthmus of the tube and into the cavity of the uterus where it implants
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What happens to ovarian follicle during ovulation
the ovarian follicle with its mature ovum ruptures through the surface of the ovary and enters the uterine tube.
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Uterus location
lies between the bladder and rectum, separated by the vesicouterine and rectouterine pouches.
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Rectouterine folds
contain the uteroscaral ligaments that anchor the uterus to the front of the sacrum
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Uterus features
hollow, thick walled, muscular organ about he size and shape of an inverted pear
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Body and fundus of uterus
- form the upper 5 cm
- fundus is the rounded part that tlies above the entrance to the tubes
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Cervix
cylindrical and narrow, forms lower 3 cm. Projects into the upper end of the vagina
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endometrium
- mucosa that lines the uterine cavity.
- undergoes cyclical changes each month.
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myometrium
1 cm thick wall consists of smooth muscle
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broad ligament
- consists of 2 layers of peritoneum that stretch from the side of the uterus to the side wall of the pelvis.
- Between the 2 layers is loose fatty and areolar tissue and the uterine vessels and nerves
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round ligament of the uterus
fibromuscular cord that curves forward from the angle between uterus and tube across the pelvic brim and passes through the deep inguinal ring. It traverses the inguinal canal, emerges through the superficial inguinal ring and blends with the areolar tissue in the labium majus
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Vagina details
- 9-10 cm long collapsed fibromuscular tube.
- pubovaginalis and bulbospongiosus are vaginal sphincters.
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Walls of vagina
- Anterior wall is in contact with the bladder and urethra.
- Posterior wall contacts the rectum
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Cervix details
projects into the upper end of the vagina which which forms a circular gutter around the cervix termed the anterior, posterior and lateral fornices
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Testicles
lies in the scrotum invaginated into the posterior wall of a closed peritoneal sac, the tunica vaginalis
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epididymis
a highly coilded tube attached posteriolaterally to the testis
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Seminiferous tubules
hair-like, sperm is produce here.
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Sperm movement
produced in seminiferous tubules of testis. Pass through 15-20 efferent ductules in the head of the epididymis. Then pass into the body and then tail of epididymis that becomes continuous with the ductus deferens
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Temperature of testes
controlled by contraction and relaxation of the cremaster and dartos muscles
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Dectus deferens
becomes part of the spermatic cord and ascends through the superficial inguinal ring. inguinal canal and deep inguinal ring to enter the pelvis
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Ductus deferens expands into?
into the ampulla at the back of the bladder.
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Lateral to each ampulla
convoluted seminal vesicle
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Ejaculatory ducts
ampulla and duct of the seminal vesicle join to form the ejaculatory duct. It passes through the back of the prostate to empty into the urethra.
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Prostate
- firm, fibromuscular glad lying just below the neck of the bladder, surrounding the urethra and sitting on the urogenital diaphragm.
- Secretions of the prostate and seminal vesicles form most of the seminal fluid (semen)
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Rectum
follows the curvature of the sacrum down and forwards to the anorectal junction
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Anorectal junction
where the rectum passes through the pelvic diaphragm and becomes the anal canal which passes down and back to the anus
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perineal flexure
backward bend, maintained by the puborectalis
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internal anal sphincter
a thickening of the circular smooth muscle layer of the gut
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Internal sphincter innervation
innervated by the inhibitory parasympathetic fibers from the pelvic splanchnic nerves (S2-4) and excitatory sympathetic fibers from the prevertebral ganglia.
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external anal sphincter
skeletal muscle arranged in subcutaneous, superficial, and deep parts
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external anal sphincter innervation
innervated by the pudendal nerve (S2-4)
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Blood supply for pelvis and perineum
supplied by the internal ilia artery and its branches
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blood supply for rectum and upper half of anal canal
superior rectal branch of the inferior mesenteric artery
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gonad blood supply
by the testicular and ovarian branches of the abdominal aorta
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Internal iliac artery supplies
viscera and walls of pelvis, perineum, gluteal region and medial compartment of the thigh.
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superior and inferior vesical arteries
bladder and adjacent structures
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middle rectal artery
- lower rectum
- anal canal, adjacent structures
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iliolumbar and lateral sacral arteries
pelvic walls
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internal pudendal artery
leaves the pelvis through the greater sciatic foramen, runs between the sacrospinous and sacrotuberous ligaments and enters the perineum through the lesser sciatic foramen. Runs in the pudendal canal (located in the obturator internus fascia. Branches include inferior rectal, perineal and dorsal artery of the penis or clitoris.
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superior and inferior gluteal arteries
gluteal region
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obturator artery
medial compartment of the thigh
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inferior hypogastric (pelvic) plexuses
smooth muscles and glands of the pelvis and perineum are innervated by sympathetic and parasympathetic fibers
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Sympathetic provided by
preganglionic cells from T10-L2
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