nerves misc Flashcards
spinal levels of subcostal n
T12
spinal levels of iliohypogastric n
L1
spinal levels of ilioinguinal n
L1
spinal levels of lateral cutaneous n of thigh
L2-L3
spinal levels of femoral n
L2-L4
spinal levels of genitofemoral n
L1-L2
spinal levels of obturator n
L2-L4
general course and function of genital branch of genitofemoral n
Genitofemoral n (combined) pierces psoas major.
Genital branch goes thru deep AND superficial inguinal rings.
Travels inside spermatic cord.
Motor to cremaster.
Sensory to scrotum // labia major and mons pubis.
general course and function of femoral branch of genitofemoral n
Genitofemoral n (combined) pierces psoas major.
Femoral branch travels inferior to inguinal ligament.
Sensory to upper anterior thigh.
general course and function of ilioinguinal n
Travels alongside spermatic cord.
Passes thru superficial ring only.
NOT inside spermatic cord.
Sensory to skin of lower abdominal wall, scrotum/labia majora.
general course and function of iliohypogastric n
Most superficial.
Does not pass thru any inguinal rings.
Sensory to area below umbilicus.
greater splanchnic n (synapses on, arteries it travels with, area of referred pain)
Celiac ganglion.
Celiac trunk/foregut arteries.
Epigastric pain.
lesser splanchnic n (synapses on, arteries it travels with, area of referred pain)
Superior mesenteric ganglion.
SMA/midgut arteries.
Periumbilical pain.
least splanchnic n (synapses on, arteries it travels with, area of referred pain)
Aorticorenal ganglion.
Renal arteries.
Hypogastric pain.
Lumbar splanchnic n (synapses on, arteries it travels with, area of referred pain)
Inferior mesenteric ganglion.
IMA/hindgut arteries.
Hypogastric/inguinal pain.
referred pain from testes/ovaries
lower abdomen (T11/T12)
somatic pain from skin of scrotum
pudendal area
from pudendal n.
parasympathetic innervation to large intestine
VAGUS to proximal 2/3 of transverse colon.
PELVIC SPLANCHNIC to distal colon
spinal levels of pelvic splanchnic n
S2-S4
spinal levels of sciatic n
L4-S3
spinal levels of pudendal n
S2-S4
spinal level of nerve to levator ani
S3-S4
spinal level of nerve to coccygeus
S3-S4
superior hypogastric plexus contains sympathetic or parasympathetic nn?
superior hypogastric plexus contains SYMPATHETIC nerves
inferior hypogastric plexus contains sympathetic or parasympathetic nn?
inferior hypogastric plexus contains BOTH sympathetic and parasympathetic nerves
MIXED AUTONOMIC
visceral afferent fibers superior to pain line
follow SYMPATHETIC fibers retrograde
visceral afferent fibers inferior to pain line
follow PARASYMPATHETIC fibers retrograde to S1-S2
functions of sympathetic autonomic nerves of pelvis/perineum
- vasocontrict
- increase sweat secretions
- contract male internal urethral sphincter
- contract internal anal sphincter
- move sperm, stimulate seminal secretions
- stimulate lubricating glands
functions of parasympathetic autonomic nerves of pelvis/perineum
- vasodilate
- contract detrusor muscle (facilitates voiding)
- stimulate engorgement of erectile tissues
- modulate enteric NS control of distal bowel
- inhibit contraction of male internal urethral sphincter
- inhibit contraction of internal anal sphincter
major nerve of the perineum
pudendal n (S2-S4)
somatic efferent nerves of the vagina
Somatic efferent fibers only in lower portion of vagina.
Upper portion only has visceral efferent.
can only feel pain in lower portion of vagina
