Back, Shoulder, Scapula Flashcards
Trapezius
Origin
EOP, Medial 1/3 Superior Nuchal Line, Nuchal L., SP C7-T12
Trapezius
Insertion
Lateral 1/3 Clavicle, Spine of Scapula, Acromion Process
Trapezius
Innervation
Spinal Accessory N. (CN XI) (MOTOR)
Ventral Rami C3-C4 (SENSORY)
Trapezius
Action
Upper: Scapular Elevation
Middle: Scapular Retraction
Lower: Scapular Depression
Closed Chain: Ipsilateral lateral flexion, head and neck extension
Latissimus Dorsi
Origin
Thoracolumbar Fascia, SP T7-L5, Sacrum, Iliac Crest, and Ribs 9-12
Latissimus Dorsi
Insertion
Floor of Intertubercular Groove of Humerus
Latissimus Dorsi
Innervation
Thoracodorsal N. (C6-C8)
Latissimus Dorsi
Action
Humerus: adduction, extension, medial rotation
Levator Scapulae
Origin
Posterior Tubercles TP C1-C4
Levator Scapulae
Insertion
Superior angle of scapula
Levator Scapulae
Innervation
Dorsal Scapular N. (C5)
Ventral Rami C3-C4
Levator Scapulae
Action
Scapula: elevation, downward rotation
Closed Chain: Ipsilateral lateral flexion of neck
Rhomboid Minor
Origin
SP C7-T1
Rhomboid Minor
Insertion
Medial border of the scapula at the level of the scapular spine
Rhomboid Minor
Innervation
Dorsal Scapular N. (C5)
Rhomboid Minor
Action
Scapula: Retraction, downward rotation, helps fix scapula to thoracic wall
Rhomboid Major
Origin
SP T2-T5
Rhomboid Major
Insertion
Medial border of the scapula inferior to the scapular spine
Rhomboid Major
Innervation
Dorsal Scapular N. (C5)
Rhomboid Major
Action
Scapula: Retraction downward rotation, helps fix scapula to thoracic wall
Supraspinatus
Origin
Supraspinous Fossa
Supraspinatus
Insertion
Superior 1/3 greater tubercle of humerus
Supraspinatus
Innervation
Suprascapular N. (C5-C6)
Supraspinatus
Action
Humerus: initiates abduction
Infraspinatus
Origin
Infraspinous Fossa
Infraspinatus
Insertion
Middle 1/3 greater tubercle of humerus
Infraspinatus
Innervation
Suprascapular N. (C5-C6)
Infraspinatus
Action
Humerus: Lateral Rotation
Teres Minor
Origin
Superior 1/2 Lateral border of scapula
Teres Minor
Insertion
Inferior 1/3 greater tubercle of humerus
Teres Minor
Innervation
Axillary N. (C5-C6)
Teres Minor
Action
Humerus: Lateral rotation, weak adduction
Teres Major
Origin
Inferior angle of scapula, inferior 1/2 lateral border of scapula
Teres Major
Insertion
Medal lip intertubercular groove of humerus
Teres Major
Innervation
Lower Subscapular N. (C5-C6)
Teres Major
Action
Humerus: Medial rotation, adduction, weak extension
Subscapularis
Origin
Subscapular Fossa
Subscapularis
Insertion
Lesser tubercle of humerus
Subscapularis
Innervation
Upper Subscapular N. (C5-C6)
Lower Subscapular N. (C5-C6)
Subscapularis
Action
Humerus: Medial Rotation
Serratus Anterior
Origin
Lateral 1st-9th ribs
Serratus Anterior
Insertion
Anterior medial border of scapula
Serratus Anterior
Innervation
Long Thoracic N. (C5-C7)
Serratus Anterior
Action
Scapula: protraction, upward rotation, holds scapula close to thoracic wall
Deltoid
Origin
Lateral 1/3 clavicle, acromion process, scapular spine
Deltoid
Insertion
Deltoid tuberosity of humerus
Deltoid
Innervation
Axillary N. (C5-C6)
Deltoid
Action
Humerus: abduction, flexion, extension