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Gross Anatomy 1 > Pelvic Nerves > Flashcards

Pelvic Nerves Flashcards

1
Q

Lumbosacral Plexus

A
  • formed mainly by branches of L4-L7, S1-S3

- emerge from vertebral canal through intervertebral foramina, caudal to corresponding vertebra

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2
Q

Nerves of the Lumbosacral plexus

A
  • Lateral cutaneous femoral
  • Genitofemoral
  • Femoral
  • Obturator
  • Sciatic
  • Cranial gluteal
  • Caudal gluteal
  • Caudal cutaneous femoral
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3
Q

Lateral cutaneous femoral N.

A

Innervates

  • skin over the lateral aspect thigh
  • Stifle joint

Test site
-4cm cranial to greater trochanter

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4
Q

Genitofemoral N.

A

Innervates

  • skin over the medial aspect of the thigh
  • Male = prepuce and scrotum
  • Female = inguinal mammary glands, skin surrounding vulva

Test site
-femoral triangle

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5
Q

What is the action of the quadriceps femoris muscle on the stifle joint?

A

extension

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6
Q

Femoral N.

A

Innervates

  • Quadriceps femoris muscle - ALL 4 heads
  • iliopsoas muscle
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7
Q

Injury to the Femoral N.

A
  • overextension of the quadriceps femoris m = e.g. during recovery after anesthesia
  • pelvic fracture -> paralysis of quadriceps femoris m. -> incapable of supporting weight

Common to amputate leg if this injury occurs

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8
Q

Saphenous N.

A

Innervates

  • Sartorius m.
  • skin over the medial aspect of thigh, and tarsus (metatarsus and plantar surface of the 2nd digit)

Test site
-4cm distal to the medial epicondyle of the femur

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9
Q

What muscles adduct the pelvic limb?

A
  • adductor
  • gracilis
  • pectineus
  • external obturator
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10
Q

Obturator N.

A

Innervates
-adductor muscles of the pelvic limb

No cutaneous branches

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11
Q

Injuries to the Obturator Nerve

A
  • Pelvic fracture

- Compression of the nerve = cattle during calving

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12
Q

Lumbosacral Trunk

A
  • formed mainly by ventral branches of L6, L7, S1, and S2
  • largest part of lumbosacral plexus
  • continued outside pelvis as sciatic nerve
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13
Q

Cranial gluteal N.

A

Innervates

  • middle gluteal muscle
  • deep gluteal muscle
  • tensor fascia lata

No cutaneous branches

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14
Q

Caudal gluteal N.

A

Innervates

  • superficial gluteal muscle
  • (middle gluteal m., piriformis m., cranial portion of biceps femoris m.)

No cutaneous branches

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15
Q

Sciatic or Ischiatic N.

A

Innervates

  • biceps femoris
  • quadratus femoris
  • semitendinosus
  • semimembranosus muscles
  • (+ deep gluteal m, internal obturator m, gemelli m)
  • skin over lateral aspect of thigh (dist. 1/2), lateral and caudal aspect of the crus

Test site
-mid lateral aspect of leg at level of tibial tuberosity

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16
Q

Injuries to the Sciatic N.

A
  • fractures
  • misdirected intramuscular injection
  • complication of hip and femoral surgery
17
Q

Common fibular N.

A

Innervates

  • flexor muscles of the tarsus
  • extensor muscles of the digits
18
Q

What muscles flex the tarsus?

A
  • cranial tibial
  • fibularis longus
  • fibularis brevis
19
Q

What muscles extend the digits?

A
  • long digital extensor

- lateral digital extensor

20
Q

Injury to the Common fibular N

A

Misdirected intramuscular injection

Causes dropped foot (“knuckle over”) and loss of sensation of the dorsal surface of the paw

21
Q

Superficial and deep fibular N.

A

Innervates Skin

  • on dorsolateral aspect of distal crus
  • on dorsal aspects of metatarsal and digital regions
22
Q

Tibial N.

A

Innervates

  • extensor muscles of the tarsus
  • flexor muscles of the digits
  • interossei muscles
  • skin on plantar surface of metatarsus and digits
23
Q

Extensor muscles of the tarsus?

A

gastrocnemius muscle

24
Q

Flexor muscles of the digits?

A

SDF and DDF

25
Q

Injury to the Tibial N.

A
  • misdirected intramuscular injection
  • hock is dropped (not all the way)
  • loss of sensation of the plantar surface of the paw
26
Q

Caudal cutaneous femoral N.

A

Innervates
-skin over the caudal aspect of the thigh

Test site
-4cm distal to the ischiatic tuberosity

27
Q

Dorsal common digital nerves of the hindpaw

A
  • superficial

- Superficial fibular nerve

28
Q

Dorsal metatarsal nerves of the hindpaw

A
  • deep

- Deep fibular nerve

29
Q

Plantar metatarsal nerves of the hindpaw

A
  • deep

- Lateral plantar nerve

30
Q

Plantar common digital nerves of the hindpaw

A
  • superficial

- Medial plantar nerve

31
Q

What does the caudal rectal nerve innervate?

A

external anal sphincter

32
Q

Test site of the Lateral cutaneous femoral N.

A

4cm cranial to greater trochanter

33
Q

Test site of the Genitofemoral N.

A

femoral triangle

34
Q

Test site of the Saphenous N.

A

4cm distal to the medial epicondyle of the femur

35
Q

Test site of the Sciatic N.

A

mid lateral aspect of leg at level of tibial tuberosity

36
Q

Test site of the Caudal cutaneous femoral N.

A

4cm distal to the ischiatic tuberosity

Gross Anatomy 1 (20 decks)

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