Pelvic and Perineal Neurology

Question 1

anterior scrotal n

Answer 1

anterior scrotum

Question 2

anterior labial n

Answer 2

anterior labia majora

Question 3

genital branch of genitofemoral n.

Answer 3

scrotum in males and labia majora in females

Question 4

obturator n

Answer 4

enters the Pelvis along the lateral Pelvic Wall,
travels into the Obturator Canal with the Obturator A. and V., branches into an
anterior and posterior division and innervates Medial Thigh musculature

Question 5

lumbosacral trunk

Answer 5

feeds into the Sacral Plexus

Question 6

superior gluteal n

Answer 6

gluteus medius m and gluteus minimus m

Question 7

inferior gluteal n

Answer 7

gluteus maximus m

Question 8

n to quadratus femoris m

Answer 8

L4-S1

Question 9

n to obturator internus m

Answer 9

L5-S2

Question 10

n to piriformis

Answer 10

S1-2

Question 11

posterior Femoral cutaneous n

Answer 11

S1-3; to the Buttock and upper most region of posterior Thigh

Question 12

perineal branch

Answer 12

scrotum (M) labia majora (F)

Question 13

perforating cutaneous branches

Answer 13

S2-3 to the medial buttock

Question 14

inferior rectal n

Answer 14

anal canal inferior to the pectinate line and external anal sphincter m

Question 15

dorsal n of penis

Answer 15

travels along the dorsum of the penis

Question 16

dorsal n of clitoris

Answer 16

travels along the dorsum of the clitoris

Question 17

deep perineal n

Answer 17

superficial and deep transverse perineal ms, ischiocavernosus m, bulbospongiosus m, vaginal vestibule and inferior most part of the vagina

Question 18

posterior scrotal n

Answer 18

terminal branch of perineal n to posterior aspect of scrotum

Question 19

posterior labial n

Answer 19

terminal branch of perineal n to posterior aspect of labia majora

Question 20

anococcygeal n

Answer 20

small area of skin in the coccygeal region

Question 21

n to levator ani

Answer 21

S4

Question 22

n to coccygeus

Answer 22

S4,5

Question 23

Lumbar (abdominal) sympatheitc trunk

Answer 23

Paravertebral
Sympathetic Trunk; continuous superiorly with the Thoracic Sympathetic
Trunk and inferiorly with the Sacral (Pelvic) Sympathetic Trunk

Question 24

lumbar splanchnic n

Answer 24

Presynaptic Sympathetic Fibers from the Lumbar Sympathetic Trunk, L1-5, travel primarily to the
Inferior Mesenteric Ganglion to synapse onto Postsynaptic Cells, with some Postsynaptic fibers feeding into the Superior Hypogastric
Plexus

Question 25

inferior mesenteric ganglion

Answer 25

Prevertebral Sympathetic Ganglion; lies superior to the origin of the Inferior Mesenteric A., houses Postsynaptic Cell Bodies corresponding to the Presynaptic fibers from the Lumbar Splanchnic N., with branches from the Intermesenteric Plexus forms the Inferior Mesenteric and Superior Hypogastric Plexuses

Question 26

sacral sympathetic trunk

Answer 26

Paravertebral Sympathetic Trunk; continuous superiorly with the Lumbar Sympathetic Trunk, 4 paired ganglia, ending inferiorly in the midline as the Ganglion Impar

Question 27

ganglion impar

Answer 27

Coccygeal Ganglion; inferior union of the right and left Paravertebral Trunks

Question 28

sacral splanchinic n

Answer 28

Postsynaptic Sympathetic Fibers arising from the Sacral Sympathetic Trunk, feed into the Inferior Hypogastric Plexus

Question 29

pelvic splanchnic n

Answer 29

Presynaptic Parasympathetic Fibers from the 2nd through 4th levels of the Sacral part of the Spinal Cord, the Parasympathetic Fibers meet with the Sympathetic fibers of the Hypogastric N. to form the Inferior Hypogastric Plexus

Question 30

intermesenteric plexus

Answer 30

mixed Sympathetic and Parasympathetic, Sympathetic and Parasympathetic input from the Superior Mesenteric Plexus, part of the Aortic Plexus, forms the Periarterial Plexus which follow the gonadal arteries, also feeds Sympathetic into the Inferior Mesenteric Plexus and Superior Hypogastric Plexus

Question 31

periarterial plexus

Answer 31

descends with the Ovarian A

Question 32

ovarian plexus

Answer 32

innervates the Uterine Tubes | and Ovaries

Question 33

superior hypogastric plexus

Answer 33

continuous with the Intermesenteric Plexus and Inferior Mesenteric Plexus, exclusively Sympathetic, Sympathetic input from Lumbar Splanchnic Ns., lies anterior to the bifurcation of the Abdominal Aorta, produces the Ureteric Plexus and Testicular Plexus, which travel along the Common Iliac As., sends paired Hypogastric Ns. to the Inferior Hypogastric Plexus

Question 34

inferior hypogastric plexus

Answer 34

Mixed Sympathetic and Parasympathetic; Sympathetic input from Hypogastric Ns. and Sacral Splanchnic Ns., Parasympathetic input from the Pelvic Splanchnic Ns.; in addition to Parasympathetically innervating the Descending and Sigmoid Colon the Inferior Hypogastric plexus forms multiple subplexuses generically referred to as Pelvic Plexuses, these include the Vesical Plexus, Uterovaginal Plexus in females and Prostatic Plexus in males, in addition to the Prostatic Plexus many direct branches innervate Pelvic Viscera in the male, as well as the Anal Canal above the Pectinate Line in both males and females

Question 35

function to the rectum and anal canal

Answer 35

Sympathetic: contraction of the Internal Anal Sphincter M., Parasympathetic: inhibits contraction of the Internal Anal Sphincter M. and stimulates peristalsis

Question 36

vesical plexus

Answer 36

Mixed Sympathetic and Parasympathetic, continuous with the Inferior Hypogastric Plexus, innervates the Detrusor M. and Internal Urethral Sphincter M.

Question 37

function to the urinary bladder

Answer 37

Sympathetic: causes contraction of the Internal Urethral Sphincter M.; Parasympathetic: causes contraction of the Detrusor M. and relaxation of the Internal Urethral Sphincter M.

Question 38

uterovaginal plexus

Answer 38

Mixed Sympathetic and Parasympathetic, continuous with the Inferior Hypogastric Plexus, innervates the Uterus, Uterine Tubes, Vagina and Ovaries

Question 39

uterine plexus

Answer 39

innervates the Uterus and | Uterine Tubes

Question 40

cavernous ns of uterine plexus

Answer 40

Parasympathetic innervation to the Bulbs of the Vestibule, Clitoris and Vestibular Glands function: produces erection of the Clitoris, engorgement of the Bulbs of the Vestibule and increases vaginal secretion

Question 41

prostatic plexus

Answer 41

Mixed Sympathetic and | Parasympathetic, innervates the Prostate Gland and much of the male Urethra

Question 42

cavernous ns of prostatic plexus

Answer 42

convey Parasympathetic innervation to the Helicine arteries that supply the erectile tissue function: Parasympathetic: producing penile erection

Question 43

n of the ductus deferenes

Answer 43

Mixed Sympathetic and Parasympathetic, innervates the Ductus Deferens function: Sympathetic: contraction of the Internal Urethral Sphincter M., peristalsis-like contraction of the Ductus Deferens

Question 44

n of the ejaculatory ducts

Answer 44

Mixed Sympathetic and Parasympathetic, innervates the Ejaculatory Ducts function: Sympathetic: peristalsis-like contraction of the Ejaculatory Ducts

Question 45

n of the seminal vesicles

Answer 45

Mixed Sympathetic and Parasympathetic, innervates the Seminal vesicles Function: Sympathetic: contraction and secretion of the Seminal Vesicles to add to Semen