Nerves of the Pelvis and Gluteal Region Flashcards

1
Q

what is the lumbar plexus formed by?

A

ventral primary rami of L1-L3 and part of L4

and a contribution from the ventral primary rami of T12

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2
Q

what is the sacral plexus formed by?

A

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

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3
Q

what is the coccygeal plexus formed by?

A

S4, S5 and anterior coccygeal rami

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4
Q

what muscle is the lumbar plexus found in?

A

psoas major muscle

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5
Q

the anterior division of the lumbar plexus has what branches?.

A

(for flexors)
obturator n. L2-4
accessory obturator n. L3-4

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6
Q

the posterior division of the lumbar plexus has what branches?.

A

(for extensors and abductors)
genitofemoral L1-2
lateral femoral cutaneous L2,3
femoral L2-4

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7
Q

what levels is iliohypogastric?

A

L1

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8
Q

what level is ilioinguinal?

A

L1

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9
Q

which nerve passes thru the psoas major to run on its venral surface?

A

genitofemoral L1-2

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10
Q

what nerve levels are lateral femoral cutaneous n.?

A

L2-L3

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11
Q

what nerve levels are obturator nerve?

A

L2-4

*pases medial to psoas major muscle

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12
Q

what nerve levels are accessory obturator nr.?

A

L3-4

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13
Q

what nerve levels are femoral n.?

A

L2-4

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14
Q

what nerve levels are the lumbosacral trunk?

A

L4-5

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15
Q

what is the nerve furcalis?

A

anterior (ventral) ramus of L4 because it is divded btwn the lumbar and sacral plexuses

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16
Q

Name the anterior divisions of the sacral plexus.

A
  1. nerve to quadratus femoris (& inferior gemellus)
  2. nerve to obturator internus (& superior gemellus)
  3. tibial nerve
17
Q

Name the posterior divisions of the sacral plexus.

A
  1. common peroneal n.
  2. nerve to piriformis
  3. inferior gluteal n.
  4. superior gluteal n.
18
Q

levels for nerve to quadratus femoris and inferior gemellus?

A

L4-S1

19
Q

levels for nerve to obturator internus and superior gemellus?

A

L5-S2

20
Q

levels for nerve to piriformis?

A

S1,S2

21
Q

levels for superior gluteal n.?

A

L4-S1

22
Q

levels for inferior gluteal nerve?

A

L5-S2

23
Q

levels for sciatic n. ?

A

L4-S3

24
Q

the superior gluteal nerve is divided into a superior and inferior branch. what does each innervate?

A

superior br.- innervates gluteus minimus

inferior br.- innervates gluteus medius, gluteus minimus, and tensor fascia latae

25
Q

recall what nerve innervates tensor fascia lata.

A

inferior br. of superior gluteal nerve (L4-S1)

26
Q

recall what innervates gluteus maximus.

A

inferior gluteal nerve (L5-S2)

27
Q

what nerve levels does common peroneal nerve come from?

A

posterior division L4-S2

28
Q

what nerve levels does tibial nerve come from?

A

anterior division L4-S3