Chapter 41 Flashcards
Spinal nerve plexuses are derived only from…
Ventral rami
Brachial plexus is formed directly from the ventral rami of spinal nerves…
C5, C6, C7, C8, T1
The ventral rami of C5 and C6 join to form the…
Upper trunk
The ventral rami of C7 continues as the…
Middle trunk
The ventral rami of C8 and T1 join to form the…
lower trunk
The anterior divisions of the upper and middle trunks join to form the…
Lateral cord
The anterior division of the lower trunk continues as the…
Medial cord
The three posterior divisions of the upper, middle, and lower trunks all join to form the …
Posterior cord
The cords give off a total of _ nerves and then continue distally as the _ major nerves of the upper limb
8; 4
Branches of the Ventral rami
dorsal scapular nerve
long thoracic nerve
Branches of the trunks
Nerve to the subclavius
Suprascapular nerve
Branches of the cords
Lateral pectoral nerve Medial pectoral nerve Medial brachial cutaneous nerve Medial antebrachial cutaneous nerve upper subscapular nerve thoracodorsal nerve lower subscapular nerve Axillary nerve
Nerves derived from the cords
musculocutaneous nerve
ulnar nerve
radial nerve
median nerve
Dorsal scapular nerve originates from
the ventral ramus of C5
What does the dorsal scapular nerve supply? (2)
rhomboid major and rhomboid minor muscles
The long thoracic nerve originates from what?
the ventral rami of C5, C6, and C7
What does the long thoracic nerve supply?
serratus anterior muscle
What does the suprascapular nerve supply? (2)
supraspinatus muscle and infraspinatus muscle
What does the lateral pectoral nerve supply?
pectorals major muscle
What does the medial pectoral nerve supply? (2)
pectoralis minor and pectorals major
What does the medial brachial cutaneous nerve supply?
skin on the lower medial arm
What does the medial antebrachial cutaneous nerve supply?
skin on the medial forearm
What does the upper subscapular nerve supply?
subscapularis muscle
What does the thoracodorsal nerve supply?
latissimus dorsi muscle
What does the lower subscapular nerve supply? (2)
subscapularis muscle
teres major
What does the axillary nerve supply? (2)
teres minor
deltoid
What are the 3 inward extensions of the brachial fascia?
lateral intermuscular septum
medial intermuscular septum: anterior lamina
medial intermuscular septum; posterior lamina
The 3 intermuscular septa divide the arm into what 3 compartments?
Anterior compartment
Medial Compartment (Neurovascular compartment)
Posterior compartment
