lecture 8 - E2 C1

Question 1

the lateral cord and the medial form?

Answer 1

median nerve

Question 2

the 3 posterior divisions join to form the…

Answer 2

posterior cords

Question 3

the superior trunk anterior division and the middle trunk anterior division form to make the…

Answer 3

lateral cord

Question 4

the inferior trunk’s anterior division forms the..

Answer 4

medial nerve

Question 5

list the:
- rami nerves @ c5
- superior trunk nerves
- lateral cord nerve

Answer 5

• rami nerves @ c5: dorsal scapular nerve
• superior trunk nerves: nerve to subclavius + suprascapular nerve
• lateral cord nerve: lateral pectoral nerve

Question 6

lateral cord [only] branches out and becomes…

Answer 6

musculocutaneous nerve

Question 7

median nerve comes from?

Answer 7

posterior and medial cords

Question 8

posterior cord [comes from?] and becomes?

Answer 8

• comes from: all 3 posterior divisions
• posterior cord divides into axillary and radial nerve

Question 9

list the posterior cord small nerves

Answer 9

• upper subscapular nerve
• thoracodorsal nerve
• lower subscapular nerve

Question 10

medial cord’s small nerves?

Answer 10

• medial pectoral nerve
• medial brachial cutaneous nerve
• medial antebrachial cutaneous nerve

Question 11

the medial cord becomes?

Answer 11

ulnar nerve :)

Question 12

what nerve comes from c5,c6,c7,c8,t1?

Answer 12

long thoracic nerve

Question 13

subclavius
IA
SA
MA
N

Answer 13

IA: junction and costal cartilage of the first rib
SA: inferior middle surface of clavicle
MA: anchor and depress scapula
N: nerve to subclavius [C5,C6]

Question 14

anterior scalene
IA
SA
MA
N

Answer 14

IA: TP of C3-C6
SA: first rib
MA: laterally flex neck and elevate first rib during forced inhalation
N: cervical spinal nerves C4-C6

Question 15

middle scalene
IA
SA
MA
N

Answer 15

IA: T.P. C5-C7
SA: first rib
MA: laterally flex neck and elevate first rib during forced inhalation
N: anterior rami of cervical spinal nerves

Question 16

posterior scalene

Answer 16

IA: TP C5-C7
SA: SECOND rib
MA: laterally flex neck and elevate SECOND rib during forced inhalation
N: anterior rami of cervical spinal nerve C7,C8

Question 17

thoracic outlet syndrome
what happens?

Answer 17

-compression of space between the pec minor, 1st rib lower part of brachial plexus: c8-t1] , and clavicle or there may be a presence of a cervical rib
- signs: pain, weakness, atrophy, numbness, swelling peripheral nerve distribution

Question 18

quadrangular space
margins:
contents:

Answer 18

margins:
1) inferior surface of teres major
2) lateral surface of the long head triceps brachii
3) superior margin of teres major
4) surgical neck humerus

*contents:
1) axillary nerve
2) circumflex posterior humeral artery and vein

Question 19

triangular space
margins and contents

Answer 19

margins:
1) medial margin of long head triceps brachii
2) inferior margin of teres minor
3) superior margin of teres major

contents: circumflex scapular artery and vein

Question 20

triangular interval
margin and content

Answer 20

1) shaft of the humerus
s) inferior margin of the teres major
3) lateral margin of triceps brachii long head

contents:
1) profunda brachii artery
2) radial nerve

Question 21

biceps brachii
IA
SA
MA
N

Answer 21

PA:
— long head: supraglenoid
tubercle & labrum
— short head: coracoid process
DA: radial tuberosity and fascia of forearm via bicipital aponeurosis
MA: supination of forearm
- flexes elbow
- short head resists dislocation of shoulder
*main contributor to elbow flexion while forearm is supinated
N: musculocutaneous nerve (C5-C7)

Question 22

Brachialis
PA
DA
MA
Nerve

Answer 22

PA: distal anterior humerus
DA: ULNAR tuberosity and CORONOID process of ulna
MA:
- arm flexion
- * main arm flexor when arm is PRONATED
-

Question 22

Coracobrachialis
PA
DA
MA
Nerve

Answer 22

PA: coracoid process
DA: middle humerus
MA:
——helps with ARM flexion and adduction
—– resists dislocation of shoulder
Nerve: musculocutaneous nerve C5-C7