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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??
- Ulnar nerve
- 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
- 2. deltoid
- 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