Repro nerves Flashcards
What is the innervation of the Pelvic floor?
Perineal nerve (S2, 3 & 4)
What is the innervation of the external urethral sphincter
Voluntary -> somatic
= Peudendal nerve - perineal branch (S2, 3 & 4)
What nerve has voluntary/somatic control of faecal & urinary incontinence?
Pudendal nerve (S2, 3 & 4)
What is the innervation of the external anal sphincter?
inferior rectal nerve; branch of the peudendal nerve (S2, 3 & 4)
What nerve provides somatic supply to the skin at the root of the penis in the male and the labia in the female.
Ilioinguinal n (L1)
(lumbar plexus)
What nerve supplies the mons pubis and labia majora in females, and the skin of the anterior scrotum in males
Also motor innervation to cremaster muscle
Genitofemoral n (L1-L2)
(Lumbar plexus)
What nerve plexus provides autonomic nerve supply to the pelvis
Inferior hypogastric nerve plexus
Describe the sympathetic nerve supply to the internal pelvic organs
The sympathetic fibres originate from L1 and L2 via the hypogastric nerve and terminal aspect of the sympathetic trunk.
In a male they supply the vas deferens, seminal vesicles, prostate and epididymis.
In a female they supply the ovaries, uterus, fallopian tubes and vagina.
Sympathetic nerve supply to the vas deferens, seminal vesicles, prostate and epididymis.
L1 and L2 via the hypogastric nerve
Sympathetic nerve supply to the ovaries, uterus, fallopian tubes and vagina
L1 and L2 via the hypogastric nerve
Where do the parasympathetic fibres in the pelvic originate from
Pelvic splanchnic nerves (S2 - S4)
Parasympathetic innervation of erectile tissue in males and females
Pelvic splanchnic nerves (S2 to S4).
What is the hypogastric plexus composed of
The hypogastric and pelvic splanchnic nerves merge to form the inferior hypogastric plexuses, which therefore consist of both sympathetic and parasympathetic fibers
Hypogastric nerve = sympathetic supply to pelvis viscera
Pelvic splanchnic nerve= parasympathetic supply to the pelvic viscera
What ligament contains the ovarian nerve and vessels?
The suspensory ligament of the ovary
What nerve controls micturition, dilation of erectile tissue in both sexes and defecation.
Parasympathetic component of the pelvic plexus
(pelvic splanchnic nerve)
Is the internal/vesical urethral sphincter voluntary or involuntary
Involuntary
Internal = Involuntary
What is the sympathetic nerve supply of the internal/vesical urethral sphincter?
lower thoracic and upper lumbar (T11 - L2) segments of the spinal cord. These nerves maintain tonic contraction of the internal urethral sphincter, thereby preventing urine outflow from the bladder into the urethra
Sympathetic: T11-L2
What spinal level do we find the spinal micturition center, providing parasympathetic innervation to the internal urethral sphincter
Sacral levels S2-S4: spinal micturition centre
What is the parasympathetic nerve supply of the internal/vesical urethral sphincter
Sacral levels S2 - S4 (spinal micturition center). It acts to “inhibit” the internal sphincter muscle, thereby relaxing it and allowing urine to pass from the bladder into the urethra.
Parasympathetic makes you Pee
- P and P
Parasympathetic: S2-S4
Is the external urethral sphincter voluntary or involuntary
voluntary control
What is the innervation of the external urethral sphincter
Perineal branches of the pudendal nerve (S2-4)
What nerve & artery supplies the vulva
The contents of the vulva are:
- Mons pubis 2. Labia majora 3. Labia minora
- Vestibule 5. Bartholin’s glands 6. Clitoris
pudendal nerve, and internal pudendal artery
What is the nerve supply of the penis?
Ilioinguinal nerve (L1): somatic supply to skin at root of penis
Dorsal n of the penis: sensory supply to the penis
Genitogemoral nerve (L1-2): Sensory to skin of anterior scrotum
Nerve supply to pelvic floor and external urethral sphincter
peudendal nerve
What nerve supplies somatic supply to the labia?
Ilioinguinal nerve (L1)- same as somatic sensation to skin at root of penis
Nerve supply to mons pubis
Genital branch of genitofemoral nerve
Nerve supply to labia major
Genital branch of genitofemoral nerve
and ilioinguinal n
Motor innervation of cremasteric muscle
Genital branch of genitofemoral nerve
Label the missing nerves
It arises from the ventral rami (anterior divisions) of the spinal nerves S2, S3 and S4.
After its formation, the pudendal nerve descends and passes between the piriformis andischiococcygeus muscles. It leaves the pelvis through the lower part of thegreater sciatic foramen. It then crosses thesacrospinous ligament (close to its insertion to the ischial spine),and then re-enters the pelvis through thelesser sciatic foramen.
Label the missing nerves
Label this nerve and state its innervation
Ilioinguinal nerve
Motor: Internal oblique muscle, transversus abdominis muscle
Sensory: Skin of proximal medial thigh, mons pubis, labium majus and root of the clitoris; anterior scrotum and root of the penis
Label the missing nerves
Label the missing nerves
