Week 3 Muscle Quiz Flashcards
Upper Trapezius
O. Occipital bone, nuchal ligament on upper cervical spinous processes
I. Outer third of clavicle, acromion process
A. Scapular elevation and upward rotation
N. Spinal accessory
Serratus Anterior
O. Lateral surface of the upper eight ribs
I. Vertebral border of the scapula, anterior surface
A. Scapular protraction and upward rotation
N. Long thoracic nerve
Middle Trapezius
O. Spinous processes of C7-T3
I. Scapular spine
A. Scapular retraction
N. Spinal accessory
Lower Trapezius
O. Spinous processes of middle and lower thoracic vertebrae
I. Base of the scapular spine
A. Scapular depression and upward rotation
N. Spinal accessory
Anterior Deltoid Muscle
O. Lateral third of the clavicle
I. Deltoid tuberosity
A. Shoulder abduction, flexion, medial rotation, and horizontal adduction
N. Axillary nerve
Middle Deltoid Muscle
O Acromion process
I. Deltoid tuberosity
A. Shoulder abduction
N. Axillary nerve
Posterior Deltoid Muscle
O. Spine of scapula
I. Deltoid tuberosity
A. Shoulder abduction, extension, hyperextension, lateral rotation, horizontal abduction
N. Axillary nerve
Rhomboids
O. Spinous processes of C7-T5
I. Vertebral border of scapula between the spine and inferior angle
A. Scapular retraction, elevation, and downward rotation
N. Dorsal scapular nerve
Teres Major
O. Axillary border of scapula near the inferior angle
I. Crest below lesser tubercle inferior to the latissimus dorsi muscle attachment
A. Shoulder extension, adduction, and medial rotation
N. Lower subscapular nerve
Pectoralis Minor
O. Anterior surface, third through fifth ribs
I. Coracoid process of the scapula
A. Scapular depression, protraction, downward rotation, and tilt
N. Medial pectoral nerve
Coracobrachialis
O. Coracoid process of the scapula
I. Medial surface of the humerus near the midpoint
A. Stabilizes the shoulder joint
N. Musculocutaneous nerve
Latissimus Dorsi
O. Spinous processes of T7-L5, posterior surface of sacrum, iliac crest, and lower three ribs
I. Medial floor of bicipital groove of humerus
A. Shoulder extension, adduction, medial rotation, hyperextension
N. Thoracodorsal nerve
Levator Scapulae
O. Transverse processes of first four cervical vertebrae
I. Vertebral border of scapula between the superior angle and spine
A. Scapular elevation and downward rotation
N. Third and fourth cervical nerves and dorsal scapular nerve
Pectoralis Major
Clavicular Portion
O. Medial third of clavicle
I. Lateral lip of bicipital groove of humerus
A.Shoulder flexion—first 60 degrees
Sternal Portion
O. Sternum, costal cartilage of first six ribs
I. Lateral lip of bicipital groove of humerus
A. Shoulder extension—first 60 degrees (from 180 degrees to 120 degrees)
Both Together
A. Shoulder adduction, medial rotation, and horizontal adduction
N. Lateral and medial pectoral nerve
