Shoulder and Arm Origins and Insertions Flashcards
supraspinatus
Origin: supraspinous fossa of the scapula
Insertion: greater tubercle of the humerus
Action:
Shoulder Abduction
infraspinatus
Origin: infraspinous fossa of the scapula
Insertion: greater tubercle of the humerus
Action:
Shoulder Lateral(external) Rotation
Shoulder Adduction
teres minor
Origin: upper lateral border of scapula
Insertion: greater tubercle of humerus
Action:
Shoulder Lateral(external) rotation
Shoulder adduction
Nerve: Axillary Nerve
subscapularis
Origin: subscapular fossa of the scapula
Insertion: Lesser tubercle of the humerus
Action: Shoulder Medial(Internal) Rotation
Pectoralis Major
Origin: Clavicle, sternum and some of the costal cartilage of ribs
Insertion: Greater tubercle of humerus
Motions:
All:
Shoulder Adduction (prime mover)
Shoulder Medial(Internal) Rotation
Upper Fibers:
Shoulder Flexion
Shoulder Horizontal Adduction
Lower Fibers:
Shoulder Extension
Pectoralis Minor
Origin: ribs 3-5
Insertion: Coracoid process of scapula
Motions:
Scapula Protraction
Scapula Depression
Scapula Rotational Depression
Deltoid
Origin: Parts of outer clavicle
Insertion: Deltoid tuberosity
All fibers: Shoulder Abduction (prime mover)
Anterior Fibers:
Shoulder Flexion
Shoulder Medial(Internal) Rotation
Shoulder Horizontal Adduction
Posterior fibers:
Shoulder Extension
Shoulder Lateral(External) Rotation
Shoulder Horizontal Abduction
Nerve: Axillary nerve
Trapezius
Origin: occipital protuberance, ligamentum nuchae, spinous process
Insertion: spine of scapula, acromion, clavicle
Motions: rotational component
Upper fibers:
Bilaterally:
Extend Head and Neck
Unilaterally: Laterally Flex Head and Neck to Same Side Rotate Head and Neck to Opposite Side Scapula Elevation Scapula Rotational Elevation
Middle Fibers:
Scapula Retraction
Scapula Stabilize
Lower fibers:
Scapula Depression
Scapula Rotational Elevation
Nerve: Accessory (Cranial nerve XI)
Latissimus Dorsi
Origin: inferior angle of scapula, spinous process of last 6 thoracic vertebrae, last 3 or 4 ribs, thoracolumbar aponeurosis and posterior iliac crest
Insertion: intertubercular groove of the humerus
Motions:
Shoulder Adduction(prime mover)
Shoulder Extension
Shoulder Medial(Internal) Rotation
Nerve: Thoracodorsal nerve
Serratus Anterior
Origin: upper 8 or 9 ribs
Insertion: anterior surface of medial border of scapula and inferior angle
Motions: Scapula Protraction (prime mover) Scapula Depression Scapula Rotational Elevation Hold medial border of scapula against rib cage Elevate Thorax During Forced Inhalation
Nerve: Long Thoracic
Levator Scapula
Origin: upper cervical vertebrae
Insertion: medial border of scapula
Motions: Unilaterally: Scapula Elevation Scapula Rotational Depression Laterally Flex Head and Neck Rotate Head and Neck to Same Side
Bilaterally:
Extend Head and Neck
Nerve:
Cervical Nerve, Dorsal Scapular Nerve
Rhomboid minor
Origin: spinous process c7-t1
Insertion:upper portion of medial border of scapula
Motions:
Scapula Elevation
Scapula Retraction
Scapula Rotational Depression
Rhomboid major
Origin: spinous process of T2-T5
Insertion: medial border of scapula
Motions:
Scapula Elevation
Scapula Retraction
Scapula Rotational Depression
sternocleidomastoid
Actions:
Unilaterally:
Laterally Flex Head/Neck to Same Side
Rotate Head/Neck to Opposite Side
Bilaterally:
Flex Neck
Elevate Ribs during Inhalation
Nerve:
Spinal Accessory Nerve C(1) 2,3
Biceps
Origin:
Short head- coracoid process
long head- supraglenoid tubercle
Insertion: radial tuberosity & biceps aponeurosis
Motions:
Shoulder Flexion
Elbow Flexion
Forearm Supination
Nerve: musculocutaneous nerve
