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First Year Osteopathy > nervy nerves > Flashcards

nervy nerves Flashcards

1
Q

Where is the Lumbar Plexus formed?

A

within the belly of the psoas major muscle

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2
Q

In which directions do the Lumbar plexus branches exit from psoas major?

A

3 (lateral, anterior, medial)

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3
Q

What spinal nerves form the lumbar plexus?

A
  • ventral rami of L1-L4 spinal nerves
    L5 ventral ramus contributes to one of the branches of this plexus, but is not technically included in the formation of the plexus
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4
Q

Which branches of the lumbar plexus exit the psoas major laterally?

A

Iliohypogastric nerve (L1)
Ilioinguinal nerve (L1)
Lateral Cutaneous nerve of the thigh (L2, 3)
Femoral nerve (L2, 3, 4)

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5
Q

Which branches of the lumbar plexus exit the psoas major anteriorly?

A

Genitofemoral nerve (L1, 2)

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6
Q

Which branches of the lumbar plexus exit the psoas major medially?

A

Obturator nerve (L2, 3, 4)
Accessory Obturator nerve (L3, 4) - when present
Lumbosacral Trunk (L4, 5)

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7
Q

What does the Iliohypogastric nerve (L1) supply?

A
  • skin of the suprapubic region
  • also gives motor supply to abdominal muscles
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8
Q

What does the Ilioinguinal nerve (L1) supply?

A
  • skin of the inguinal region
  • also gives motor supply to abdominal muscles
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9
Q

What does the lateral cutaneous nerve of the thigh (L2, 3) supply?

A

supplied the skin of lateral thigh

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10
Q

What does the lateral cutaneous nerve of the thigh (L2, 3) pass?

A
  • inferolaterally over iliacus
  • posterior to the inguinal ligament
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11
Q

What name is the lateral cutaneous nerve of the thigh (l2, 3) also known by?

A

lateral femoral cutaneous nerve

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12
Q

What does the femoral nerve (L2, 3, 4) pass?

A
  • passes deep to the inguinal ligament into the anterior thigh
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13
Q

What does the femoral nerve (L2, 3, 4) supply?

A
  • cutaneous supply to anterior thigh, then skin of medial leg via its terminal branch the saphenous nerve
  • supplies most of anterior thigh muscles (flexors of hip & extensors of knee)
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14
Q

In what branches does the Genitofemoral nerve (L1/2) divide into?

A

genital branch
femoral branch

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15
Q

What does the genital branch supply?

A
  • supplies skin of scrotum in males & labia majora in females
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16
Q

What does the femoral branch supply?

A
  • supplies skin over the anterosuperior thigh
17
Q

What does the Obturator nerve (L2-4) pass?

A

passes through the pelvis & through obturator foramen to the medial thigh

18
Q

What does the Obturator nerve (L2-4) supply?

A
  • most of the medial thigh muscles
  • cutaneous supply of medial thigh
19
Q

What does the Accessory Obturator nerve (L3, 4) supply?

A

supplies the hip joint

20
Q

What does the Lumbosacral trunk (L4, L5) pass?

A

over the ala of sacrum to enter pelvis

21
Q

What is the Sacral Plexus formed by?

A

ventral rami of L4 - S4 (L4, L5 are via lumbosacral trunk)

22
Q

When describing the location of the sacral plexus, where is it located/formed?

A
  • located on posterolateral wall of pelvis
  • formed anterior to piriformis
23
Q

How many nerves are formed within the sacral plexus?

A

11 - only need to learn about 7

24
Q

Sciatic nerve - spinal levels

A

L4-S3

Tibial division of sciatic nerve (L4-S3)
Common fibular division of sciatic nerve (L4-S2)

25
Q

Sciatic nerve - facts

A
  • largest nerve in the body
  • exits the pelvis through the greater sciatic foramen, below piriformis
  • has two divisions held together in a common sheath (later divides into two separate nerves)
26
Q

Sciatic nerve supply

A

Cutaneous - none
Motor - tibial division supplies semimembranosus, semitendinosus, long head of biceps femoris and hamstring part of add magnus; common fibular division supplies short head of biceps femoris

27
Q

Sacral Plexus Branches

A

Nerve to piriformis (S1, S2)
Nerve to obturator internus (L5-S2)
Nerve to quadratus femoris (L4-S1)
Superior gluteal nerve (L4-S1)
Inferior gluteal nerve (L5-S2)
Perforating cutaneous nerve (S2/3)
Posterior cutaneous nerve of thigh (S2/3)

Pudenal nerve (S2-S4)
Nerve to levator ani & coccygeus (S3, S4)
Pelvic splanchnic nerves (S2-S4)

28
Q

What does Nerve to piriformis (S1, S2) supply?

A

piriformis

29
Q

What does Nerve to obturator internus (L5-S2) supply?

A

obturator internus & superior gemellus

30
Q

What does Nerve to quadratus femoris (L4-S1) supply?

A

quadratus femoris & inferior gemellus

31
Q

What does Superior gluteal nerve (L4-S1) supply and pass through?

A

supplies - glute med, min and TFL
passes through GSF superior to piriformis

32
Q

What does Inferior gluteal nerve (L5-S2) supply and pass through?

A

supplies - glute max
passes through GSF inferior to piriformis

33
Q

What does Perforating cutaneous nerve (S2/3) supply?

A

skin over medial aspect of buttocks

34
Q

What does Posterior cutaneous nerve of thigh (S2/3) supply and pass through?

A

supplies - skin ove rlower buttock, uppermost medial and posterior surfaces of the thigh
passes through GSF inferior to piriformis

35
Q

Myotomes - L1/L2

A

hip flexion

36
Q

Myotomes - L3/L4

A

knee extension

37
Q

Myotomes - L4/L5

A

knee flexion OR ankle dorsiflexion

38
Q

Myotomes - L5

A

Hallux extension

39
Q

Myotomes - S1/S2

A

Ankle plantarflexion

First Year Osteopathy (8 decks)

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