17. Internal Iliac Arteries
Posterior division:
Superior gluteal artery:
Exits pelvic cavity through greater sciatic foramen
superior to piriformis muscle.
Supplies:
Piriformis muscle.
Gluteus medius muscle.
Gluteus minimus muscle.
Tensor fascia latae muscle.
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18. Abdominal Aorta
Branches to pelvis:
Testicular (male):
Travels through inguinal canal into scrotum.
Travels inside spermatic cord.
Supplies testis.
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19. Abdominal Aorta
Branches to pelvis:
Ovarian (female):
Travels inferiorly over pelvic brim to ovary:
Through suspensory ligament.
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20. Abdominal Aorta
Branches to pelvis:
Inferior mesenteric:
Superior rectal artery:
Travels over left common iliac vessels into
pelvic cavity.
Supplies superior aspect of rectum.
Anastomoses with middle and inferior rectal
arteries.
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21. Abdominal Aorta
Branches to pelvis:
Median sacral:
From posterior aspect of termination of aorta.
Travels in median plane over L4-5, sacrum, coccyx.
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22. Veins
Most analogous and named for corresponding arteries.
Pampiniform plexus:
Inside spermatic cord.
Drains testicular vein.
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23. Veins
Internal rectal venous plexus:
Superior-most anastomosis of the three rectal veins.
External rectal venous plexus:
Inferior-most anastomosis of the three rectal veins.
Near anus.
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25. External Hemorrhoids
Produced by blood clots in external rectal venous plexus.
Bulging out of skin and mucosa from external rectal venous plexus.
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33. Lumbar Plexus
(T12) L1-5.
Ilioinguinal nerve:
Lateral to psoas major.
Anterior scrotal nerve (male):
To scrotum.
Labial branch (female):
To labia majora.
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34. Lumbar Plexus
Genitofemoral nerve (L1-2):
Anterior to psoas major.
Genital branch:
To scrotum (male).
To labia majora (female).
Lumbosacral trunk (L4-5).
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35. Sympathetic System
Lumbar splanchnic nerves:
Sympathetic.
From lumbar plexus to:
Abdominal sympathetic plexus.
Inferior mesenteric ganglion.
Superior hypogastric plexus:
To uterine tubes in female.
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36. Sympathetic System
Sacral splanchnic nerves:
Sympathetic.
From sacral plexus.
Feed into sacral sympathetic trunk and then into
inferior hypogastric plexus.
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37. Sympathetic System
Sacral sympathetic trunk:
Paravertebral ganglia.
Ganglion impar:
Coccygeal ganglion.
Superior hypogastric:
Sympathetic.
From lumbar and sacral splanchnic nerves.
Feed into inferior hypogastric plexus.
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38. Sympathetic System
Sacral sympathetic trunk:
Paravertebral ganglia.
Inferior hypogastric plexus:
Mixed parasympathetic.
In males innervates urethra, ductus deferens,
prostate gland, and ejaculatory ducts.
In females, innervates urethra and produces uterovaginal
plexus.
Produces vesicle plexus (urinary bladder).
Supplies rectum.
Uterovaginal plexus (uterus, vagina, ovaries.
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39. Parasympathetic System
Pelvic splanchnic nerves
Parasympathetic.
S2-4.
Feed into inferior hypogastric plexus.
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40. Parasympathetic System
Inferior hypogastric plexus:
In females:
Innervates:
Urethra.
Rectum.
Produces:
Uterovaginal plexus (uterus, vagina, ovaries).
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