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PNS Exam III > Sacral Spinal Nerves and Sacral plexus > Flashcards

Sacral Spinal Nerves and Sacral plexus Flashcards

1
Q

How many pairs of sacral spinal nerves are there

A

5

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2
Q

Which rami pass through the posterior sacral foramina

A

Posterior primary rami of S1-S4

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3
Q

Where does the S5 posterior primary ramus travel

A

Through the sacral hiatus

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4
Q

Which rami divide in medial and lateral branches

A

Posterior primary rami of S1-S3

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5
Q

Which branches are motor, and which are cutaneous

A

Medial are motor, Lateral are cutaneous

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6
Q

What do the medial branches supply

A

Adjacent multifidi

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7
Q

What do the lateral branches supply after unite with branches from L5 and S4

A

Skin over buttocks

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8
Q

Typically, how many sacral sympathetic ganglia are there

A

3-4

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9
Q

What will the ant. primary rami of each sacral n. receive via a gray ramus communicans

A

Postganglionic sympathetic fibers

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10
Q

What forms the sacral plexus

A

The anterior primary rami of L4, L5, S1-S3, and part of S4

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11
Q

What nerve roots make up the lumbosacral trunk

A

L4 and L5

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12
Q

Where is the sacral plexus located

A

On the anterior surface of the piriformis muscle

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13
Q

Where does the quadratus femoris and gemellus inferior leave the pelvis

A

Greater sciatic foramen

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14
Q

The N. to the obturator internus and gemellus superior leave the pelvis via _______ then re-enters via _______

A

Greater sciatic foramen; Lesser sciatic foramen

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15
Q

How is the pudendal n. transmitted to the dorsal aspect of either the penis or clitoris

A

Pudendal canal

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16
Q

What n. carries sensory info from the skin around the anus and inf. 2/3 of the anal canal

A

Inf. rectal nerves

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17
Q

What n. gives the motor supply to the external anal sphincter

A

Inferior rectal nerves

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18
Q

What supplies the External anal sphincter, bulbosponsiosus, ischiocavernosus, superficial transverse perineus

A

Deep branches of the perineal n.

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19
Q

What do the superficial branches of the perineal n. supply in males

A

Sensory: post. scrotum, urethral mucosa, bulb of penis

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20
Q

What do the superficial branches of the perineal n. supply in females

A

Sensory: labium majus, external urethral orifice, and vestibule

21
Q

What is the terminal branch of the pudendal n. in males/females

A

Dorsal n. of the penis/clitoris

22
Q

What n. supplies the deep transverse perineus and urethral sphincter muscles

A

Dorsal nerve of the penis/clitoris

23
Q

Muscular branches off the sacral plexus contain S4 fibers and supply what muscles

A

Levator ani and Coccygeus

24
Q

What n. roots make up the pelvic splanchnic n.

A

S2-S4

25
Q

What supplies the glut. medius and minimus

A

Superior branches of the superior gluteal n.

26
Q

What supplies the glut. medius, minimus, and TFL

A

Inf. branches of the superior gluteal n.

27
Q

What supplies the glut. maximus

A

Inf. gluteal n.

28
Q

What does the perforating cutaneous n. pierce

A

Sarcrotuberous ligament

29
Q

Which n. may be a branch of off the pudenal n. or absent

A

Perforating cutaneous n.

30
Q

What n. is formed from the ANT. divisions of S2 and S3 and POST. divisions of S1 and S2

A

Posterior cutaneous n. of the thigh

31
Q

The Sciatic n. is a combination of the more medial ______ and the more lateral __________

A

Tibial n.; Common fibular n.

32
Q

Most commonly, when does the sciatic n. divide

A

approx. 2/3 of the way to the knee

33
Q

What is the one muscle in the thigh supplied before the common fibular nerve separates from the tibial n. fibers

A

Biceps femoris (short head)

34
Q

What forms the sural n. after combining with the medial sural cutaneous n.

A

Fibular communicating branch

35
Q

What n. supplies the Fibularis longus and brevis

A

Superficial fibular n.

36
Q

The superficial fibular n. splits into what to nerves in order to supply the dorsum of the foot

A

Medial and Intermediate dorsal cutaneous nerves

37
Q

What is a good way to remember what m. the deep fibular n. supplies

A

The extensor muscles of the foot and toes:

Tib. anterior, Extensor digitorum longus/brevis, Extensor hallucis longus/brevis, Fibularis tertius

38
Q

What is steppage gait

A

Paralysis of the extensors, foot “slaps” the ground

39
Q

What m. are supplied by the tibial n. fibers when it is still with the common fibular

A

All hamstrings (except short head) and adductor magnus

40
Q

What does the tibial n. supply near the popliteal fossa

A

Articular branches and Popliteus, Gastroc, Soleus, Plantaris

41
Q

What carries sensory info from the tibial periosteium, ankle, and tibiofibular joints

A

Interosseous n. of the Leg from the Popliteal branch of the tibial n.

42
Q

What m. are supplied by the tibial n. in the leg

A

Flexor digitorum/hallucis longus and Tib posterior

43
Q

W n. supplies the skin over the medial heel

A

Medial calcaneal branches

44
Q

What has the motor supply to the abductor hallucis, flexor digitorum brevis, and flexor hallucis brevis

A

Medial plantar n.

45
Q

What has the motor supply to lumbricals 1&2 and sensory to skin btwn. toes via proper plantar digital nerves

A

Common plantar digital nerves

46
Q

What does the superficial branch of the lateral plantar n. supply

A

The skin around the 5th digit

47
Q

What forms the coccygeal plexus

A

Ant. rami of S4, S5, and Co1

48
Q

What nerves carry sensory info from the skin adjacent to the coccyx and anus

A

Anococcygeal nerves

PNS Exam III (4 decks)

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