Muscular System The Pectoral Girdle’
Scapula isn’t stagnate allows are to move in space.
Brachial Plexuses innervate the entire inner limb.
5 roots that come right out of the spinal cord. Come out from between vertebral
From 5 roots to 3 trunks(Superior, middle, inferior), to 6 divisions (3 anterior, 3
Clinically important any injury to shoulder, neck and arm can be assessed with
this nerve and its roots.
lots of fibres.
Not just one action.
3 separate fibre groups at least 3 different actions can be performed.
Elevate, adduct and depress.
The accessory nerve is innervating this muscle.
Major muscle & minor muscle
Come off medial border of scapular; the minor comes right off the spine of the
scapula and the major is right below it
Responsible for retraction of scapula
Dorsal scapular nerve innervates both. Same function. Adduct & help to elevate
Dorsal scapular nerve
Comes off ribs 3,4,5 and inserts on corocoid process.
Pec minor does not move the humerus.
innervated by long thoracic nerve
attaches to top 8 ribs, inserts on medial anterior border of the scapula.
Protracts shoulder blades
acts on humerus.