lecture 8 - E2 C1 Flashcards
the lateral cord and the medial form?
median nerve
the 3 posterior divisions join to form the…
posterior cords
the superior trunk anterior division and the middle trunk anterior division form to make the…
lateral cord
the inferior trunk’s anterior division forms the..
medial nerve
list the:
- rami nerves @ c5
- superior trunk nerves
- lateral cord nerve
- rami nerves @ c5: dorsal scapular nerve
- superior trunk nerves: nerve to subclavius + suprascapular nerve
- lateral cord nerve: lateral pectoral nerve
lateral cord [only] branches out and becomes…
musculocutaneous nerve
median nerve comes from?
posterior and medial cords
posterior cord [comes from?] and becomes?
- comes from: all 3 posterior divisions
- posterior cord divides into axillary and radial nerve
list the posterior cord small nerves
- upper subscapular nerve
- thoracodorsal nerve
- lower subscapular nerve
medial cord’s small nerves?
- medial pectoral nerve
- medial brachial cutaneous nerve
- medial antebrachial cutaneous nerve
the medial cord becomes?
ulnar nerve :)
what nerve comes from c5,c6,c7,c8,t1?
long thoracic nerve
subclavius
IA
SA
MA
N
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]
anterior scalene
IA
SA
MA
N
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
middle scalene
IA
SA
MA
N
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
posterior scalene
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
thoracic outlet syndrome
what happens?
-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
quadrangular space
margins:
contents:
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
triangular space
margins and contents
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
triangular interval
margin and content
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
biceps brachii
IA
SA
MA
N
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)
Brachialis
PA
DA
MA
Nerve
PA: distal anterior humerus
DA: ULNAR tuberosity and CORONOID process of ulna
MA:
- arm flexion
- * main arm flexor when arm is PRONATED
-
Coracobrachialis
PA
DA
MA
Nerve
PA: coracoid process
DA: middle humerus
MA:
——helps with ARM flexion and adduction
—– resists dislocation of shoulder
Nerve: musculocutaneous nerve C5-C7
