SACRAL PLEXUS

Question 1

-a motor nerve; from the dorsal divisions of L-4, L-5 and S-1
-exits the pelvis via the greater sciatic foramen and passes posterolaterally
through the gluteal region to supply the gluteus minimus, gluteus medius and tensor fasciae latae muscles

Answer 1

Superior Gluteal Nerve

Question 2

-a motor nerve; from the dorsal divisions of L-5, S-1 and S-2
-exits the pelvis via the greater sciatic foramen inferior to the superior gluteal nerve and passes posterolaterally through the gluteal region to supply the
gluteus maximus muscle

Answer 2

Inferior Gluteal Nerve

Question 3

• from dorsal division of S-2, (may have contribution from dorsal division of S-1)
• passes directly into the piriformis muscle
• does not exit the pelvis before entering m

Answer 3

nerve to piriformis muscle

Question 4

• the major formation of the sacral plexus
• a sensorimotor nerve; from the dorsal divisions of L-4 through S-2 and the ventral divisions of L-4 through S-3
• exits the pelvis via the greater sciatic foramen and usually continues as a single nerve to the lower thigh; however it may divide into its two component parts at any level

Answer 4

Sciatic Nerve

Question 5

-a sensorimotor nerve; from the dorsal divisions of L-4, L-5, S-1 and S-2
-the lateral portion of the sciatic nerve
-provides muscular innervation in the thigh and leg, articular innervation
to the knee and proximal tibiofibular joints, and the following cutaneous
nerve branches

Answer 5

Common Fibular Nerve / Common Peroneal Nerve

Question 6

name this branch of the common fibular nerve?

-a sensorimotor nerve; from the dorsal divisions of L-4, L-5 & S-1
-supplies part of the anterolateral aspect of the leg and ankle, and most
of the dorsum of the foot

Answer 6

Superficial Fibular Nerve / Superficial Peroneal Nerve

Question 7

name this branch of the common fibular nerve?

• a sensorimotor nerve; from the dorsal divisions of L-5, S-1 & S-2
• supplies the 1st web space and adjacent sides of the 1st and 2nd toes

Answer 7

Deep Fibular Nerve / Deep Peroneal Nerve

Question 8

name this branch of the common fibular nerve?

• a sensory nerve; from the dorsal divisions of L-5, S-1 & S-2
• supplies the proximal 2/3 of the lateral aspect of the leg

Answer 8

Lateral Cutaneous Nerve of the Calf

Question 9

name this branch of the common fibular nerve?

• a sensory nerve; from the dorsal divisions of S-1 & S-2
• passes inferiorly and joins the sural nerve

Answer 9

Sural Communicating Nerve

Question 10

• a sensorimotor nerve; from ventral divisions of L-4, L-5, S-1, S-2 & S-3
• the medial portion of the sciatic nerve
• passes inferiorly through the leg, posterior to the medial malleolus and
  divides into its terminal branches, the medial and lateral plantar nerves,
  prior to entering the foot through the porta pedis
• provides muscular innervation in the knee and leg, articular innervation
  to the knee and ankle joints and the following cutaneous nerve branches

Answer 10

Tibial nerve

Question 11

name this branch of the tibial nerve?

• a sensory nerve; from the ventral divisions of S-1 & S-2 - supplies small area of the posterior leg, posterolateral aspect of the ankle, the lateral aspect of the foot, and the lateral ½ of the fifth toe

Answer 11

Medial Sural Cutaneous Nerve (Sural Nerve)

Question 12

name this branch of the tibial nerve?

• a sensory nerve; from the ventral divisions of S-1 & S-2 - pierces the flexor retinaculum to supply the medial ½ of the calcaneal region

Answer 12

Medial Calcaneal Nerve

Question 13

• not a direct branch of the Medial Sural Cutaneous Nerve
• a sensory nerve; from dorsal and ventral divisions of S-1 & S-2 because the sural communicating nerve joins to make the sural nerve
• supplies the lateral ½ of the calcaneal region

Answer 13

Lateral Calcaneal Nerve

Question 14

• a sensory nerve; from the dorsal divisions of S-1 and S-2, and ventral divisions of S-2 and S-3
• dorsal divisions lie close to the inferior gluteal nerve divisions, ventral divisions lie close to the pudendal nerve divisions
• exits the pelvis via the greater sciatic foramen with the sciatic nerve and passes distally to the knee, anterior to the deep fascia, to supply cutaneous innervation to the posterior aspects of the thigh and the calf

Answer 14

Posterior Femoral Cutaneous Nerve

Question 15

• from the dorsal divisions of S-1 & S-2, and ventral divisions of S-2 & S-3
• small branches of the posterior femoral cutaneous nerve that arise near
  the exit point from the pelvis and provide cutaneous supply to the inferior gluteal region

branch of the posterior femoral cutaneous nerve

Answer 15

Inferior Cluneal Nerves

Question 16

• a sensory nerve; from the dorsal divisions of S-2 and S-3
• exits the pelvis by piercing the sacrotuberous ligament to supply cutaneous innervation to the small area of the inferior medial aspect of the buttock and the medial gluteal fold

Answer 16

Perforating Cutaneous Nerve

Question 17

• a sensorimotor nerve; from the ventral divisions of S-2, S-3 and S-4
• exits the pelvis via the inferomedial part of the greater sciatic foramen, passes posterior to the sacrospinous ligament and re-enters the pelvis via the lesser sciatic foramen
• supplies motor innervation to structures of the urogenital triangle and sensory innervation to the reproductive organs

Answer 17

Pudendal Nerve

Question 18

• a motor nerve; from the ventral divisions of L-5, S-1 and S-2
• exits the pelvis via the greater sciatic foramen and reenters the pelvis via the
  lesser sciatic foramen, with the pudendal nerve
• supplies motor innervation to obturator internus and superior gemellus mm.

Answer 18

nerve to obturator internus and superior gemellus muscles

Question 19

• a sensorimotor nerve; from the ventral divisions of L-4, L-5 and S-1
• exits the pelvis via the greater sciatic foramen
• supplies motor innervation to quadratus femoris and inferior gemellus muscles, and articular innervation to the hip joint

Answer 19

nerve to quadratus femoris and inferior gemellus muscles

Question 20

• parasympathetic fibers from S-2, S-3 and S-4 - supply the pelvic viscera (organs which can’t be removed without resection
• bladder, rectum and internal reproductive organs)

Answer 20

Pelvic Splanchnic Nerves