Brachial Plexus & Lumbosacral Plexus

Question 1

Brachial plexus is formed in the

Answer 1

Posterior triangle of the neck

Question 2

Brachial plexus is the union of the

Answer 2

Anterior rami of the
5,6,7,8th cervical spinal nerves
1st thoracic spinal nerves

Question 3

Upper trunk Union of the roots ___

Answer 3

C5 & C6

Question 4

Middle trunk continuation of the roots ___

Answer 4

C7

Question 5

Lower trunk Union of the roots ___

Answer 5

C8 & T1

Question 6

From the 3 posterior divisions of the 3 trunks

Answer 6

Posterior cord

Question 7

From the anterior divisions of the upper and middle trunks

Answer 7

Lateral cord

Question 8

the continuation of the anterior division of the lower trunk

Answer 8

Medial cord

Question 9

C5,C6,C7 branches

Answer 9

Long thoracic nerve

Question 10

C5 branches

Answer 10

Dorsal scapular nerve

Question 11

Upper trunk branch

Answer 11

Suprascapular nerve

Question 12

Supplies supraspinatus & infraspinatus

Answer 12

Suprascapular nerve (upper trunk branch)

Question 13

Upper trunk gives of the nerve to

Answer 13

Subclavius

Question 14

Lateral cord gives rise to

Answer 14

Lateral Pectoral nerve
Lateral root of median nerve
Musculocutanous nerve

Question 15

Posterior cord gives rise to

Answer 15

Upper subscapular nerve
Lower subscapular nerve
Thoracodorsal nerve
Radial nerve
Axillary nerve

Question 16

Brachial plexus injury (upper trunk)

Answer 16

Erb-Duchenne palsy “waiter’s tip position”

Question 17

Brachial plexus injury (lower trunk)

Answer 17

Klumpke palsy

Question 18

Lumbar plexus formation

Answer 18

By ventral rami of L1,2,3 and most of L4

Question 19

Lumbar plexus site

Answer 19

In the substance of posas major

Question 20

Lumbar plexus main branches to anterior abdominal wall

Answer 20

iliohypogastric & ilioingyinal

Question 21

Lumbar plexus main branches to median compartment of thigh

Answer 21

Obturator

Question 22

Lumbar plexus main branches to anterior compartment of thigh

Answer 22

Femoral

Question 23

Femoral nerve origin

Answer 23

Branch of lumbar plexus (L2,3,4)

Question 24

Descends lateral to psoas major & enters the thigh behind the inguinal ligament

Answer 24

Femoral nerve

Question 25

Passes lateral to femoral artery & divides into terminal branches

Answer 25

Femoral nerve

Question 26

Femoral nerve injury (motor effect)

Answer 26

Wasting of quadriceps femoris Loss of extension of knee

Question 27

Sacral plexus formation

Answer 27

By ventral rami of a part of L4 & whole L5 (lumbosacral trunk) + S1, 2, 3 and most of the S4

Question 28

Sacral plexus site

Answer 28

In front of piriformis muscle

Question 29

Sacral plexus main branches (parasympathetic to pelvic viscera & hindgut)

Answer 29

Pelvic splanchnic nerve

Question 30

Pudendalnerve (from sacral plexus) branches to

Answer 30

perineum

Question 31

Sciatic nerve (from Lumbosacralplexus: L4&5+S1,2,3) branches to

Answer 31

lower limb

Question 32

Sciatic nerve origin

Answer 32

From sacral plexus

Question 33

Leaves the pelvis through greater sciatic foramen, then to posterior of thigh compartment

Answer 33

Sciatic nerve

Question 34

Divides into tibial & common peroneal (fibular) nerves

Answer 34

Sciatic nerve

Question 35

Descends through popliteal fossa to posterior compartment of leg, accompanied with posterior tibial vessels

Answer 35

Tibial nerve

Question 36

Leaves popliteal fossa & turns around the lateral aspect of neck of fibula

Answer 36

Common peroneal (fibular) nerve

Question 37

Common peroneal (fibular) nerve Leaves popliteal fossa & turns around the lateral aspect of neck of fibula. Then divides into :

Answer 37

Superficial peroneal: descends into *lateral* compartment of leg Deep peroneal : descends into *anterior* compartment of leg