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What is the brachial plexus?
an arrangement of nerve fibers running from the spine
The brachial plexus is formed by the rami from the ____ to the _____ nerves and the ____ nerve.
C5 to C8 (Cervical nerves) and the T1 (Thoracic nerve).
Merging rami form the ___ of the brachial plexus.
The roots unite to form 3 _____.
Where is the brachial plexus located???
in the posterior triangle of the neck
*the triangular gap is formed by the anterior and middle scalene muscle and 1st rib --where muscles are attached.
C5 and C6 combine to form the ________ trunk.
C7 forms the ______ trunk.
C8 and T1 combine to form the ____ trunk.
Trunks divide into ____.
Divisions are made up of what two parts??
Anterior and posterior divisions
Trunks run posterior to the ____.
Trunks pass from the neck to the axilla through the _____ ____.
When the trunks cross the first rib what happens?
they divide into the anterior and posterior divisions.
The anterior divisions usually supply the ______ muscles.
The posterior divisions usually supply the _____ muscles.
All 3 posterior divisions unite to form the ____ ___.
The anterior divisions of the superior and middle trunks unite to form the ____ __.
The anterior division of the inferior trunk forms the ___ __.
The lateral cord contains what 3 branches?
1. lateral pectoral nerve
2. musculocutaneous nerve
3. lateral root of the median nerve
What does the musculocutaneous nerve innervate?
the flexors of the upper arms
What does the median nerve supply?? (3)
1. primarily the flexor muscle in the anterior compartment of the forearm,
2. the skin of part of the hand, and
3. 5 hand muscles
The medial cord has 5 branches.. but what are the 2 nerves we should know??
and medially root of median nerve
What does the ulnar nerve supply??
1. half of the muscles in the anterior compartments of the hand,
2. most of the intrinsic muscles in the hand,
3. and the skin on the median side of the hand
The posterior cord has 5 branches..what 2 nerves should we know??
axillary nerve and radial nerve
What 3 areas does the axillary nerve supply???
1. teres minor
3. skin over inferior half of deltoid
What 2 areas does the radial nerve supply?
supplies all extensor muscles of the posterior compartments of the upper limb and the skin on the postural aspect of the arm and forearm