Anatomy of the Reproductive System Part 3: Blood Supply and Innervation Flashcards
Arterial supply
outline how the external and internal iliac arteries are formed starting with the abdominal aorta
think bifurcation
abdominal aorta –> bifurcates into right and left common iliac arteries at L4 vertebral level –> common iliac arteries bifucate into internal and external iliac arteries
arterial supply
waht do the internal iliac arteries supply and what do the external iliac arteries supply
think pelvis for internal, think limbs around the longest bone in the body for external
Internal iliac arteries supply:
- pelvic region
External iliac arteries:
- travel towards lower limbs and become the femoral arteries
anterior trunk of interal iliac artery
what are 8 arterial branches of the anterior trunk of the internal iliac artery?
think UOS VIU MI
(1 of them is exclusive to women and 1 is variable depending on if it is a man or woman)
- umbilical artery
- obturator artery
- superior vesical artery
- vaginal/inferior vesical artery (only vaginal in women)
- Internal pudendal artery
- Uterine artery (women only)
- middle rectal artery
- inferior gluteal artery
anterior trunk of internal iliac artery
where is venous drainage of the pelvic organs?
into the internal iliac veins
innervation of the perineum
what nerve provides somatic innervation and where does this nerve come from?
- pudendal nerve provides somatic innervation
- nerve comes form sacral plexus of anterior rami of S2-S4 spinal nerves
innnervation of the perineum
how does the pudendal nerve exit and reenter the pelvic cavity
exits via: greater sciatic foramen
re-enters: via lesser sciatic foramen
innervation of pelvic organs
what 2 places does sympathetic innervation of the pelvic organs come from
- from T10-L2 lumbar splanchnic nerves via hypogastric plexi
- from L1-L2/3 sacral splanchnic nerves via sympathetic chain and inferior hypogastric plexus
innervation of pelvic organs
from where do pelvic organs receive parasympathetic innervation
- from S2-S4 pelvic splanchnic nerves via inferior hypogastric plexus
autonomic innervation of pelvic organs
what 4 things can sympathetic innervation of pelvic organs cause
think ejaculation, contraction of a sphincter in males, contraction of smooth muscle in a layer in women and constriction of blood vessels
- secretion (ejaculation)
- contraction of interal urethral sphincter in males
- contracts smooth muscle in myometrium in women
- causes vasocontriction
autonomic innervation of pelvic organs
what 4 things can parasympathetic innervation of pelvic organs cause
think bladder, relaxation of a sphincter in males, contraction of a smooth muscle in women and opening of blood vessels
- bladder contraction
- relaxation of internal urethral sphincter in males
- contracts uterine smooth muscle in cervix in women
- vasodilation