Exam 3- Sacral Plexus

Question 1

What branch of the sacral plexus travels through the sacral hiatus

Answer 1

Posterior ramus of S5

Question 2

Which way does the posterior sacral rami decrease in size?

Answer 2

Superior to Inferior

Question 3

The posterior rami of S1-S3 divide into what two branches

Answer 3

Medial and lateral branches

Question 4

What branch of the posterior rami of S1-S3 is motor?

Answer 4

The medial branch is motor, supplies the adjacent Multifidus

Question 5

The lateral posterior branches of S1-S3 supply the

Answer 5

Skin over the buttocks and combine with L5 and S4

Question 6

What branches of the sacral plexus combine with the coccygeal posterior rami to supply the skin over the coccyx

Answer 6

S4 and S5

Question 7

How many sacral sympathetic ganglia are there

Answer 7

Three or four

Question 8

The anterior primary of each sacral nerve receives postganglionic fibers via

Answer 8

A gray ramus communicans

Question 9

The gray ramus communicans sends what kind of fibers to the anterior primary rami of each sacral nerve?

Answer 9

Postganglionic sympathetic fibers

Question 10

The sacral plexus is formed by the anterior primary rami of

Answer 10

L4,L5, S1-S3, and part of S4

Question 11

How does L4, L5 contribute to the Sacral plexus

Answer 11

Via the lumbosacral trunk

Question 12

Where is the sacral plexus formed?

Answer 12

On the anterior surface of the piriformis muscle

Question 13

What fibers make up the nerve to the quadratus femoral and gemellus inferior

Answer 13

L4,L5,S1 nerves

Question 14

The nerve to the quadratus femoris and gemellus inferior exit the pelvis through

Answer 14

The greater sciatic foramen

Question 15

What muscles contribute to the lateral rotation and adduction of the thigh

Answer 15

Nerve to the quadratus femoris and gemellus inferior

Question 16

The nerve to obturator internus and gemellus superior is fibers from

Answer 16

L5, S1,S2

Question 17

THe nerve to the obturator internus and gemellus superior exits the pelvis through the

Answer 17

Greater sciatic foramen

Question 18

The nerve to obturator internus re enters the pelvis via the

Answer 18

Lesser sciatic foramen to supply obturator internus

Question 19

What muscles contribute to lateral rotation and abduction of the thigh

Answer 19

Nerve to obturator internus and gemellus superior

Question 20

The pudendal nerve contains fibers from

Answer 20

S2,S3,S4

Question 21

The pudendal nerves course is

Answer 21

Leaves pelvis via greater sciatic foramen, arches around the ischial spine, and into the perineum via the lesser sciatic foramen

Question 22

The pudendal nerve travels in the

Answer 22

Pudendal canal, inferior to the pubic symphysis to reach the dorsal side of the Penis or Clitoris

Question 23

The inferior rectal nerves are a branch of

Answer 23

The pudendal nerve

Question 24

The inferior rectal nerves carries sensory info from

Answer 24

The skin around the anus and the inferior 2/3 of the anal canal

Question 25

The inferior rectal nerves is the motor supply to

Answer 25

External anal sphincter

Question 26

The perineal nerve is a branch of the

Answer 26

Pudendal nerve

Question 27

The deep branches of the perineal nerve supply what four muscles

Answer 27

External anal sphincter Bulbosponsiosus Ischiocavernosus Superficial transverse perineus

Question 28

The superficial branches of the perineal nerve supplies

Answer 28

Sensory fibers Males- posterior sacrum, urethral mucosa, bulb of penis Females- labium majus, external urethral orifice, vestibule

Question 29

What is the terminal branch of the pudendal nerve

Answer 29

The dorsal nerve of the penis/clitoris

Question 30

What does the dorsal nerve of the penis/clitoris motor supply

Answer 30

Deep transverse perineus Urethral sphincter muscles

Question 31

The dorsal nerve sensory fibers supply

Answer 31

Males- corpus cavernosum, glans penis, skin covering the penis Females- corpus cavernosum, clitoris

Question 32

What supplies the levator ani and coccygeus muscles

Answer 32

Muscular branches of S4

Question 33

The pelvic splanchnic nerve contains fibers from

Answer 33

S2,S3,S4

Question 34

The nerve to piriformis contains fibers from

Answer 34

S1,S2

Question 35

The superior gluteal nerve is made up of fibers

Answer 35

L4,L5,S1

Question 36

The superior gluteal nerve leaves the pelvis via

Answer 36

Greater sciatic foramen, superior to the piriformis and splits into superior and inferior branches

Question 37

The superior gluteal nerve superior branches supply

Answer 37

Gluteus medius and minimus

Question 38

The inferior branches of the superior gluteal nerve supply

Answer 38

Gluteus medius, gluteus minimus, tensor fascia late

Question 39

The inferior gluteal nerve fibers are from

Answer 39

L5,S1,S2

Question 40

The inferior gluteal nerve leaves the pelvis via the

Answer 40

Greater sciatic foramen inferior to piriformis,

Question 41

What muscles does the inferior gluteal nerve supply

Answer 41

Gluteus Maximus

Question 42

The perforating cutaneous nerve contains fibers from

Answer 42

S2,S3

Question 43

The perforating cutaneous nerve travels

Answer 43

Through the sacrotuberous ligament, ultimately reaching lower medial aspects of the buttocks

Question 44

The perforating cutaneous nerve may also be formed by a branch off of

Answer 44

The pudendal nerve or be absent

Question 45

The posterior cutaneous nerve of the thigh is made up of

Answer 45

Anterior division of S2,S3 Posterior divisions of S1,S2

Question 46

The posterior cutaneous nerve of the thigh travels

Answer 46

Exits pelvis through greater sciatic foramen, descends through posterior thigh and inferior to the leg where it will communicate with the SURAL NERVE

Question 47

The posterior cutaneous nerve of the thigh supplies the skin on the

Answer 47

Posterior and medial thigh

Question 48

What is the largest nerve in the human body

Answer 48

Sciatic nerve

Question 49

What is the size of the sciatic nerve

Answer 49

2 cm in diameter

Question 50

What are the two nerves that combine to make up the sciatic nerve

Answer 50

Tibial nerve and common fibular nerve

Question 51

The tibial nerve is formed by the

Answer 51

Anterior divisions of L4-S3 Is located medial

Question 52

The common fibular nerve is made up of

Answer 52

Posterior divisions L4-S2

Question 53

The sciatic nerve exits the pelvis in a common shealth through the

Answer 53

Greater sciatic foramen, below the piriformis

Question 54

The sciatic nerve travels posterior aspect of the

Answer 54

Adductor Magnus, approx. 2/3 of the way to the knee, where it splits into common fibular and tibial