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GM PNS > Exam 3: Lumbar Spinal Nerves > Flashcards

Exam 3: Lumbar Spinal Nerves Flashcards

1
Q

How many nerve pairs are in the lumbars

A

Five

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2
Q

What do the medial and lateral branches of the posterior rami supply

A

Medial branches = multifidi, lateral branches = erector spinae group

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3
Q

What is special about post primary rami

A

It is strictly motor!

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4
Q

The anterior primary rami contribute to what

A

The lumbar (L1-L4) and sacral (L4 and L5) plexus

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5
Q

How many lumbar sympathetic ganglia are there

A

4

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6
Q

How do gray and white communicans communicate with sympathetic trunk

A

White rami communicans associated with L1,L2, L3 sometimes and gray rami communicans associated with each lumbar nerves

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7
Q

What forms the lumbar plexus

A

L1-L3 and part of L4 as well as receive some contribution from T12 by way of communication of L1 nerve

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8
Q

What muscular branches supply the quadratus lumborum, psoas minor, psoas major

A

L1-L4 supply QL, L1-L2 p. Minor, L3-L4 p.major

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9
Q

What fibers are contained in the iliohypogastric nerve

A

T12 and L1

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10
Q

How does the iliohypogastric nerve travel

A

Anterior and inferior between the QL and kidney. Then through the transverse abdominal muscle and travels between it and the internal abdominal oblique then give off the lateral cutaneous branch

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11
Q

What does the lateral cutaneous branch supply

A

The posterolateral gluteal region

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12
Q

What does the lateral cutaneous branch continue as

A

The anterior cutaneous branch

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13
Q

What does the anterior cutaneous branch supply

A

Supplies the skin of the pubic region

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14
Q

What fibers contribute to the ilioinguinal nerve

A

T12 and L1

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15
Q

How does the ilioinguinal nerve travel

A

Follow path similar to iliohypogastric nerve enters and is transmitted through the inguinal canal. It leaves the canal through superficial inguinal ring and travels with spermatic cord.

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16
Q

What does the ilioinguinal nerve supply sensory to where?

A

Snesory to skin of the upper medial thigh, base of penis, anterior scrotum in men, in females = mons pubis and labium majus

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17
Q

What muscles does the ilioinguinal nerve travel to

A

Internal abdominal oblique and transverse abdominal

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18
Q

What fibers are contained in the genitofemoral nerve

A

L1 and L2

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19
Q

The genitofemoral nerve travels through the ______ and divides into ______

A

Psoas major muscle and divides into genital branch and femoral branch

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20
Q

How does the genital branch travel

A

Enters and travels through the inguinal canal, leaves canal and provides motor supply to cremaster muscle and sensory supply to skin of anterior scrotum, and mons pubis/labium majus in females

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21
Q

The femoral branch passes into thigh posterior to inguinal ligament and supplies the skin of where

A

The upper anterior thigh

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22
Q

What is the reflex associated with the genital branch

A

Cremasteric reflex

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23
Q

What fibers are contained in the lateral cutaneous nerve of the thigh

A

L2 and L3

24
Q

What type of nerve is the lateral cutaneous nerve of the thigh

A

Purely sensory

25
Q

What does the lateral cutaneous nerve of the thigh supply

A

Skin of lateral thigh, superior to the knee

26
Q

How dos the lateral cutaneous nerve of the thigh travel

A

The nerve leaves the abdominal cavity by passing under inguinal ligament. It travels anterior to the sartorius and through the fascia lata to reach the skin

27
Q

What branches are contained in the femoral nerve

A

L2, L3, L4

28
Q

What is special about the femoral nerve

A

It is the largest branch of the lumbar plexus

29
Q

How does the femoral nerve travel

A

Forms posterior to psoas major and emerges latral to psoas and anterior to iliacus passes inferior to inguinal ligament and enters femoral triangle just lateral to femoral artery. Runs inferior and medially through the adductor canal and into leg, medial to knee

30
Q

Where does the femoral nerve give off branches

A

Only in abdomen and femoral triangle

31
Q

What branches off the femoral nerve are given off in the abdomen

A

Muscular brnches to iliacus and pectineus and some to femoral artery

32
Q

Once beyond the ____ the femoral nerve divides into anterior and posterior division

A

Inguinal ligament

33
Q

What 3 nerves does the anterior division of the femoral nerve give off

A

Intermediate cutaneous nerve of the thigh, medial cutaneous nerve of the thigh, nerve to the sartorius

34
Q

What does the intermediate cutaneous nerve of the thigh supply

A

The skin on anterior thigh down to knee, lateral branch communicates with femoral branch of the genitofemoral nerve

35
Q

What does the medial cutaneous nerve of the thigh supply

A

Skin of medial thigh, medial knee, and knee across to the laateral side of patella. Some supply skin medial leg through communications with saphenous nerve

36
Q

What does the posterior division of femoral nerve give rise to

A

Muscular branches, vascular branches, saphenous nerve

37
Q

What do the posterior divisions muscular branches supply

A

Quadriceps muscles

38
Q

What do the vascular branches of the femoral nerve supply

A

The femoral artery and articular branches to the knee joint before continuing as saphenous nerve

39
Q

Muscular branches given off in femoral triangle supply what?

A

Sartorius, rectus femoris, vastus lateralis, vastus medialis, vastus intermedius

40
Q

What is the saphenous nerve transmitted through

A

The adductor canal

41
Q

What does the saphenous nerve supply

A

Skin medial and anterior to patella, it travels with great saphenous vein and supplies the skin of the medial leg and foot

42
Q

What clinical considerations are associated with the femoral nerve

A

Patellar reflex, sensory deficits

43
Q

What fibers are contained in the obturator nerve

A

L2, L3, L4

44
Q

What nerve is the principal contributor to the obturator nerve

A

L3, L2 is minimal

45
Q

How does the obturator nerve travel

A

Medial to psoas major, posterior to common iliac vessels, descends into the pelvis, traveling on obturator internus. Leaves pelvis through obturator foramen and divides

46
Q

What are the obturator nerve branches initially separated by

A

Obturator externus and adductor brevis

47
Q

What does the anterior branch of the obturator do

A

Send some branches to communicate with branches of femoral nerve forming subartorial plexus

48
Q

What does the subsartorial plexus do

A

Contributes to supply of the skin onn the medial thigh

49
Q

The termination of the anterior branch of the obturator nerve supplies what

A

The femoral artery, sends branches to hip joint

50
Q

What muscles are supplied by termination of anterior branch

A

Adductor longus, gracilis, pectineus, adductor brevis (TQ)

51
Q

The anterior branch of obturator nerve may connect with what

A

Accessory obturator nerve

52
Q

The anterior branch of obturator nerve may send fibers to communicate with what

A

medial cutaneous nerve of thigh and saphenous nerve = obturator then will contribute to skin on upper medial side of leg

53
Q

The posterior branch of the obturator nerve travels through the what

A

Obturator externus, posterior to adductor brevis, and anterior to adductor magnus

54
Q

The posterior branch of obturator nerve sends muscular branches to where

A

Obturator externus and adductor magnus and adductor brevis if not by anterior branch also articular fibers to knee joint

55
Q

What are clinical considerations of the obturator nerve

A

Muscular weakness and sensory deficits

GM PNS (12 decks)

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