ANATOMY: pelvis innervation

Question 1

The vast majority of innervation of the pelvic cavity, perineum, reproductive systems, and the lower limb originates in the ?

Answer 1

Sacral and coccygeal plexuses

Question 2

The vast majority of innervation of the pelvic cavity, perineum, reproductive systems, and the lower limb are formed from the?

Answer 2

Ventral rami of L4-Coccyx

Question 3

Which nerves enter the pelvic cavity from the abdomen, anterior to the sacro-iliac joint?

Answer 3

L4-L5

Question 4

Which nerves enter from the sacral foramina, moving laterally and inferiorly on the pelvic wall?

Answer 4

S1 -S4

Question 5

Which nerves run anterior to piriformis muscle?

Answer 5

L4-S3/4

Question 6

Which nerves emerge below the pelvic floor?

Answer 6

S5 & Coccyx

Question 7

All sacral plexus have ventral divisions except for?

Answer 7

L4-S3 = have dorsal divisions

Question 8

What is the largest and thickets nerve in the body?

Answer 8

The sciatic nerve

Question 9

Sciatic nerve divides into?

Answer 9

Tibial part

Common fibular part

Question 10

Ventral division of tibial part

Answer 10

L4-S3

Question 11

Dorsal division of Common fibular part

Answer 11

L4-S2

Question 12

Which nerve has the motor function of integrating selected muscles in the thigh,leg and foot

Answer 12

Tibial part of sciatic nerve

Question 13

Which nerve has the motor function of innervation of short head of biceps, all muscles in ant. and lat. compartments of leg, selected muscles of the foot ?

Answer 13

Common fibular part of sciatic nerve

Question 14

What is the sensory function of the tibial part of the sciatic nerve?

Answer 14

Contributes to skin on foot

Question 15

What is the sensory function of the common fibular part of the sciatic nerve?

Answer 15

Contributes to skin on the leg and foot

Question 16

Anococcygeal nerves

Answer 16

Ventral S4 - Coccyx

Sensory: perianal skin

Question 17

Sympathetic fibres derive from

Answer 17

Hypogastric nerves and sacral splanchich nerves

Question 18

Which nerves:

• Innervate blood vessels
• Contraction of smooth muscle in internal urethral sphincter
• Contraction of internal anal sphincters
• Smooth muscle contraction of reproductive tract and accessory glands.
• Aid movement of secretions from epididymis and glands into the urethra to form semen.

Answer 18

Sympathetic fibres

Question 19

Parasympathetic fibres arise from?

Answer 19

Pelvic splanchich nerves: S2-S4

Question 20

Which nerves:

• Generally vasodilatory.
• Stimulate bladder contraction.
• Stimulate erection.
• Modulate mobility in the GI tract distal to the splenic flexure.

Answer 20

Parasympathetic fibres

Question 21

Inferior rectal nerve, perineal nerve and dorsal nerve of the penis/clitoris and branches of the?

Answer 21

Pudendal nerve

Question 22

Which nerve:

Penetrates through the fascia of the pudendal canal, coursing medially across the ischio-anal fossa
•Motor: external anal sphincter and levator ani muscle.
•Sensory: Skin of anal triangle
•Works with the Nerve to levator ani, coccygeus, and external anal sphincter from the sacral plexus.

Answer 22

Inferior rectal nerve

Question 23

Which nerve:

Passes through the pudendal canal into the urogenital triangle and branches.
•Motor: Muscles in the superficial and deep perineal pouches.
•Sensory:
•Males – Posterior 2/3rds of scrotum via posterior scrotal nerve.
•Females – Posterior labial nerve

Answer 23

Perineal nerve

Question 24

Which nerve:

Terminal branch of the pudendal nerve.
•Enters the deep perineal pouch, passing along the lateral margin and then exiting the perineal membrane inferior to the pubic symphysis to the body of the penis/clitoris.
•Sensory: Body of penis/clitoris, especially glans.

Answer 24

Dorsal nerve of the penis/clitoris

Question 25

Parasympathetic (excitatory) input to the penis comes from the?

Answer 25

S1-S4 via the pelvic splanchich nerves

Question 26

Parasympathetic (excitatory) input to the penis produces

Answer 26

Vasodilation and erection

Question 27

Sympathetic (inhibitory) input to the penis comes from the?

Answer 27

T11-L1 via the sympathetic trunk

Question 28

Sympathetic (inhibitory) input to the penis produces?

Answer 28

Vasoconstriction Contraction of seminal glands and prostate Seminal fluid emission

Question 29

The major artery associated with the pelvis, perineum and reproductive systems is the ?

Answer 29

Internal iliac artery

Question 30

Lymphatics from pelvic viscera drain towards lymph nodes distributed along the internal and external iliac arteries and their associated branches. These go onto the common iliac arteries, aortic and lumbar nodes, and then drain into the lumbar trunks which continue to become the origin of the thoracic duct at?

Answer 30

T12

Question 31

Hat is the main muscle located in the anal triangle?

Answer 31

External anal sphincter

Question 32

Strong connective tissue structure that serves as an attachment point for muscles of the pelvic floor and perineum.

Answer 32

Perineal body

Question 33

Episiotomy

Answer 33

Incision in the perineal body to facilitate passage of the head of the foetus

Question 34

Contains the roots of the external genitalia and the urogenital hiatus. Has strong support from deep perineal pouch and perineal membrane Superficial perineal pouch contains the roots of external genitalia.

Answer 34

Urogenital triangle