Sacral Plexus

Question 1

What 6 nerves belong to sacral plexus

Answer 1

1. N. Gluteus cranialis
2. N. Gluteus caudals
3. N. Cutaneus femoris caudalis
4. N. Ischiadicus
5. N. Pudendus
6. Nn. Caudales rectales

Question 2

Nervus gluteus cranialis

Answer 2

> Motor
Supplies middle & deep gluteal & tensor fasciae latae muscles
Short nerve

Question 3

Nervus gluteus caudalis

Answer 3

> Motor
Supplies extensor of hip (superficial gluteal muscle & vertebral head of hamstring muscle)

Question 4

Nervus cutaneus femoris caudalis

Answer 4

> Motor and sensory
Supplies skin on lateral and caudal aspect of thigh and hip joint

Question 5

Nervus Ischiadicus

Answer 5

> Motor and sensory
Thickest nerve in the body
Exits through foramen ischiadicum major
Supplies deep gluteal, internal obturatoe, quadriceps, and gemelli muscles
Sensory fibres supply the capsule of hip joint
Divides into
- N. Tibialis
- N. Peroneus communis

Question 6

Nervus ischiadicus: Nervus Tibialis

Answer 6

> Runs caudally
Supplies biceps femoris, gastrocnemius, semitendinosus & Semimembranosus muscles
Divides into
- N. Cutaneus surae caudalis
- N. Plantaris medialis et lateralis

Question 7

Nervus ischiadicus: Nervus Peroneus communis

Answer 7

> Supplies skin on dorsal aspect of knee
Divides into
- N. Cutaneus surae lateralis
- N. Peroneus: superficialis et profundus

Question 8

Nervus pudendus

Answer 8

> Motor, sensory and parasympathetic fibres
Supplies urethral muscles, rectum, penis vulva, clitoris, M. Bulbocavernous, ischiocavernous, perineum, caudal part of udder
Divides into parasympathetic fibres
- Nn. Pelvini
- Plexus pelvinus

Question 9

Nervi Rectales caudales

Answer 9

> Sensory and motor
Overlaps with M. Pudendus
Supplies anal and bulbospongius muscles and perineal skin

Question 10

Sacral plexus location

Answer 10

> ventrally, the last 3 lumbar and first 2 sacral branches form the plexus
Located in pelvic cavity
Location for high and low epidural anesthesia

Question 11

What structures does N. Gluteus cranialis innervate?

Answer 11

Gluteus medius, Gluteus profundus and Tensor fasciae latae

Question 12

What structures does N. Gluteus caudalis innervate?

Answer 12

Biceps femoris, Gluteobiceps, Gluteus superficialis, Vertebral heads of hamstring muscles

Question 13

What structures does N. Cutaneus femoris caudalis innervate?

Answer 13

Semitendinosus, Skin on lateral and caudal aspect of thigh and hip joint

Question 14

What structures does N. Ischiadicus innervate?

Answer 14

Gluteus profundus, obturatorius internus, quadriceps, gemelli, capsule of hip joint

Question 15

What structures does N. Tibialis innervate?

Answer 15

Biceps femoris, gastrocnemius, semitendinosus, semimembranosus

Question 16

What structures does N. Pernoneus communis innervate?

Answer 16

The skin on knee

Question 17

What structures does N. Pudendus innervate?

Answer 17

Urethral, Ischiocavernous, Bulbocavernous muscles, Perineum, rectum, penis, clitoris, vulva, caudal part of udder

Question 18

What structures does Nn. Caudales rectales innervate?

Answer 18

Caudal rectum, external anal sphincter, skin surrounding anus, Bulbospongious muscle