Muscles of Shoulder Girdle Flashcards
Muscles of the Axioappendicular
Pectoralis Major
Pectoralis Minor
Subclavius
Serratus Anterior
PA of Pectoralis Major
Clavicular Head: medial ½ of
clavicle; Sternocostal head:
anterior sternum, superior 6 costal
cartilages (ribs)
DA of Pectoralis Major
Lateral lip of the intertubercular groove
Nerve Supply Pec Major
Lateral and Medial Pectoral Nerves
Action of Pec Major
adducts/medially rotates humerus
Clavicular head- flexes humerus
PA Pec Mino
3rd-5th ribs near their costal cartilages
DA Pec Minor
Coracoid Process of Scapula
Nerve Supply of Pec Minor
Medial Pectoral Nerve
Action of Pec Minor
Stabilises scapula by drawing it inferiorly and anteriorly on thoracic cage
PA Subclavius
Junction of 1st rib and costal cartilage
DA Subclavius
Inferior surface of middle third of clavicle
Action Subclavius
Anchors and depress clavicle
PA Serratus Anterior
External surface of lateral part of ribs 1-8
DA Serratus Anterior
Anterior surface of medial border of scapula
Nerve Supply of Serratus Anterior
Long Thoracic nerve
Action of Serratus Anterior
Protracts scapula and holds it on thoracic wall, rotates scapula (glenoid fossa superiorly)
Posterior Axioappendicular Muscles
Superficial- Trapezius, Latmissimus Dorsi
Deep- Levator Scapulae, Rhomboid Major, Rhomboid Minor
Trapezius
Superior (descending)
Middle(Transerve)
Inferior(ascending)
PA Trapezius
Superior nuchal line, external occiptual protuberance nuchal ligament, Spinal Process of c7-t12 vertebrae
DA Traps
Lateral 1/3rd clavicle, acromion and spine of scapula
NERVE Supply of Trapzius
Accessory Nerve (CN XI) motor (3,4 Spinal Nerves (pain and propioception)
Action of Trapezius
Superior: elevates scapula
Middle: retracts scapula
Inferior: Depress scapula
SUP+INF= rotate glenoid fossa superiorly
Nerve Supply Subclavius
Subclavian Nerve
PA Latissimus Dorsi
SPs of inferior 6 thoracic vert, thoracolumbar fascia, iliac crest, inferior 3-4 ribs
DA Latissimus Dorsi
Floor of the intertubercular groove
Nerve Supply Latissimus Dorsi
Thoracodorsal nerve