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Anatomy > Lumbosacral Plexus And Pelvic Limb Nerves > Flashcards

Lumbosacral Plexus And Pelvic Limb Nerves Flashcards

1
Q

What three nerves innervate the abdominal wall?

A

Costoabdominal n, cranial iliohypogastric n, caudal iliohypogastric n

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2
Q

What two components make up the lumbosacral plexus and what are their corresponding vertebra?

A

Lumbar component L3-L6
Sacral component S1-S3

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3
Q

What are intercostal nerves?

A

Intercostal nerves are the ventral branches of thoracic spinal nerves 1-12

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4
Q

What structures do intercostal nerves provide motor function for?

A

External and internal intercostal mm, transversus thoracis m, and rectus abdominis m

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5
Q

What provides the cutaneous sensory innervation from intercostal n?

A

Lateral cutaneous branch and ventral cutaneous branch

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6
Q

True or False: the nerves that innervate the abdominal wall all provide sensory and motor function.

A

True

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7
Q

What makes up the lumbosacral plexus?

A

Ventral branches of lumbar and sacral spinal nerves

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8
Q

The genitofemoral nerve is motor to what structure?

A

Cremaster muscle

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9
Q

The genitofemoral nerve is sensory for what?

A

From skin in inguinal region (inguinal mammary gland, prepuce) and proximal medial thigh

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10
Q

The genitofemoral nerve is formed by ventral branches of which vertebra spinal nerves?

A

L3 and L4

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11
Q

True or False: the genitofemoral nerves supplies motor function only in males.

A

True

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12
Q

The obturator nerve innervates adductors of pelvic limb, which includes what structures?

A

External obturator muscle, pectineus muscle, gracilis muscle, adductor muscle

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13
Q

The obturator nerve arises from which spinal nerves?

A

L4, L5, L6

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14
Q

The obturator nerves supplies what function?

A

Motor

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15
Q

The femoral nerve arises from which spinal nerves?

A

L4, L5, L6

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16
Q

The femoral nerve emerges from what structure?

A

Iliopsoas muscle

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17
Q

What structures does the femoral nerve innervate and provide motor function?

A

Iliopsoas muscle, quadriceps femoris muscle, sartorius muscle

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18
Q

The femoral nerve gives rise to what other nerve and what is its function?

A

Saphenous nerve
Cutaneous innervation to skin of medial femoral, genual, tibial and pes regions

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19
Q

Describe the afferent input, central connection, and efferent output of the patellar reflex.

A

Afferent input: the sensory receptor in the quadriceps muscle sends a signal along the afferent neuron to the spinal cord
Central connection: the signal synapses at the level of L3 and L4 in the spinal cord
Efferent output: an alpha motor neuron conducts efferent impulse back to the quadriceps femoris muscle, triggering contraction. Contraction causes the leg to kick.

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20
Q

The caudal cutaneous femoral nerve arises from which spinal nerves?

A

S1, S2, S3

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21
Q

The caudal cutaneous femoral nerve terminates where?

A

In skin on proximal caudal half of thigh

22
Q

The caudal cutaneous femoral nerve follows the caudal gluteal artery to the level of what?

A

Ischiatic tuberosity

23
Q

The lumbosacral trunk gives rise to what nerves?

A

Caudal gluteal nerve, cranial gluteal nerve, sciatic nerve (ischiatic nerve)

24
Q

The lumbosacral trunk is formed by the ventral branches of?

A

L6, L7, S1, S2

25
Q

The caudal gluteal nerve provides motor function to what structure?

A

Superficial gluteal muscle

26
Q

The cranial gluteal nerve provides motor function to what structures?

A

Middle gluteal muscle, piriformis muscle, deep gluteal muscle, tensor fasciae latae muscle

27
Q

The efferent sciatic nerve innervates what structures within the pelvis?

A

Internal obturator muscle, gemelli muscle, quadratus femoris muscle

28
Q

The efferent sciatic nerve innervates what structures caudal to the hip?

A

Biceps femoris muscle, semimembranosus muscle, semitendinosus muscle

29
Q

Describe the path of the sciatic nerve.

A

Courses over greater ischiatic notch, dorsal and caudal to the coxal joint

30
Q

What nerves arise from the fibular and tibial components of sciatic nerve to supply cutaneous innervation to lateral and caudal surfaces of crus?

A

Lateral and caudal cutaneous sural nerves

31
Q

Proximal to the stifle, the sciatic nerve divides into?

A

Common fibular (peroneal) nerve and tibial nerve

32
Q

The common fibular (peroneal) nerve innervates?

A

Flexors of the tarsal joint and extensors of the digit

33
Q

The tibial nerve innervates?

A

Extensors of the tarsal joint and flexors of the digit

34
Q

The common fibular nerve divides into?

A

Deep and superficial peroneal (fibular) nerves

35
Q

The deep fibular nerve innervates?

A

Cranial tibial muscle, long digital extensor muscle, peroneus longus muscle

36
Q

The deep fibular nerve courses distally with what vessel?

A

Cranial tibial artery

37
Q

The superficial fibular nerve innervates?

A

Lateral digital extensor muscle and peroneus brevis muscle

38
Q

The tibial nerve arises from what spinal nerves?

A

L7, S1

39
Q

The tibial nerve innervates?

A

Gastrocnemius muscle, superficial digital flexor muscle, deep digital flexor muscle, popliteus muscle

40
Q

The tibial nerve divides into what sensory nerves?

A

Medial and lateral plantar nerves

41
Q

The medial and lateral plantar nerves are sensory to?

A

Plantar surface of pes

42
Q

What is/are the most probable muscle(s) affected (paralysis) in a total laceration of the tibial nerve at the level of the popliteal fossa?

A

Gastrocnemius, plantaris, popliteus, and soleus in cats

43
Q

What is the cutaneous region with hypoesthesia or numbness, in a dog with the common fibular nerve sectioned?

A

Digit 2, 3, 4, and 5 then up the dorsal side of the tarsocrural joint

44
Q

What are clunial nerves in the lumbar component of the lumbosacral plexus?

A

Dorsal cutaneous branches from the last four lumbar nerves that innervate the skin in the gluteal area

45
Q

What are clunial nerves in the sacral component of the lumbosacral plexus?

A

Dorsal cutaneous branches from the sacral nerves that innervate the skin in the gluteal and dorsal areas of the pelvis

46
Q

The pudendal nerve includes what nerve branches?

A

Dorsal rectal nerve, perineal nerve, dorsal nerve of the penis/nerve of the clitoris

47
Q

Where is the most caudal end of the conus medullaris located in dogs and cats?

A

Located at the level of the caudal half of the L6 vertebra and the cranial part of the L7 vertebra
Can also be found at L7-S1 in cats depending on the individual

48
Q

The pelvic nerve is from what spinal nerves?

A

S1, S2

49
Q

The pelvic nerve fibers run into what structures before getting distributed to its target organs?

A

Pelvic plexus

50
Q

The pelvic plexus lives lateral to what?

A

Rectum

Anatomy (18 decks)

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