Superficial Back Muscles Flashcards
Latissimus Dorsi (attachments)
From lower thoracic spinous processes, thoracolumbar fascia & iliac crest to the floor of the intertubercular sulcus of the humerus
Latissimus Dorsi (action)
Adduction, extension & IR of humerus
Latissimus Dorsi (innervation)
Thoracodorsal n. (C6-8)
Levator Scapulae (attachments)
From transverse processes of C1-4 to the superior angle & superomedial border of scapula
Levator Scapulae (actions)
Elevation & downward rotation of scapula
Levator Scapulae (innervation)
Dorsal scapular n. (C4-5)
Sensory: direct branches of C3-4
Pectoralis Major (attachments)
From clavicle, costal cartilages, sternum & aponeurosis of the external oblique to lateral lip of intertubercular sulcus of humerus
Pectoralis Major (actions)
Humeral adduction, flexion, IR
Sternocostal portion assists w/ extension of flexed arm
Pectoralis Major (innervation)
Medial & lateral pectoral n.
(Clavicular head: C5-6
Sternocostal head: C7-T1)
Pectoralis Minor (attachments)
From outer surfaces of ribs 3-5 to the coracoid process
Pectoralis Minor (actions)
Anterior tilt of scapula, assists w/ depression of shoulder & forced inspiration
Pectoralis Minor (innervation)
Medial & lateral pectoral nerves (C5-T1)
Rhomboids (attachments)
Major: from spinous processes T2-5
Minor: from ligamentum nuclear & spinous processes C7-T1
to medial border of scapula
Rhomboids (actions)
Scapular retraction, elevation (upper) & downward rotation
Rhomboids (innervation)
Dorsal scapular n. (C4-5)
Sensory: direct branches of C3-4
Serratus Anterior (attachments)
From the outer surfaces & superior borders of upper 8-10 ribs to the costal surface of medial border of scapula
Serratus Anterior (actions)
Scapular protraction & upward rotation
Serratus Anterior (innervation)
Long thoracic n. (C5-7)
Subclavius (attachments)
From 1st rib & cartilage to undersurface of the clavicle
Subclavius (actions)
Depresses & stabilizes clavicle
Subclavius (innervation)
Subclavian n. (C5-6)
Trapezius (attachments)
From the superior nuchal line, external occipital protuberance, ligamentum nuchae, cervical & thoracic spinous processes to the clavicle, acromion & scapular spine
Trapezius (actions)
Upper: scapular elevation, upward rotation
Lower: depression, upward rotation
Middle: retraction
Trapezius (innervation)
Accessory n. (CN XI; motor) & C3-4 (sensory)
Latissimus Dorsi (attachments)
From lower thoracic spinous processes, thoracolumbar fascia & iliac crest to the floor of the intertubercular sulcus of the humerus
Latissimus Dorsi (action)
Adduction, extension & IR of humerus
