MUSCLE THAT MOVE THE SCAPULA ON THE BACK

Origin of the Trapeizus

-External Occipital Proturberance 

-Medial ⅓ of Superior Nuchal Line 

-Ligamentum Nuchae

-Spinous processes & supraspinous ligaments of C7-T12 vertebrae

Trapezius Insertion

-Lateral third of Clavicle

-Acromion & Spine of Scapula

Trapezius Action

-Retract (closer), elevate & depress the scapula 

-Lateral Rotation of the (inferior angle) scapula during abduction of the arm

Trapezius Nerve Supply

-Spinal part of accessory nerve (Cranial nerve XI), C3 & C4

Origin of Levator Scapulae

-Posterior tubercles of transverse processes of C1-C4 vertebrae

Levator Scapulae Insertion

-Medial border of scapula above the spine

Levator Scapulae Action

-Elevate & medially rotates the scapula

Levator Scapulae Nerve Supply

-Dorsal scapular nerve

Origin of rhomboid major

-Spinous processes of T2-T5 vertebrae

Rhomboid Major Instertion

-Medial border of the scapula below the spine

Rhomboid Major Actions

Retract & medially rotate scapula

Rhomboid Major Nerve Supply 

-Dorsal scapular nerve

Origin of Rhomboid Minor

-Nuchal ligament & spinous processes of C1-C7 vertebrae

Rhomboid Minor Insertion

-Medial border of the scapula at the root of the spine

Rhomboid Minor Action

-Retract & medially rotate scapula

Rhomboid Minor Nerve Supply

-Dorsal scapular nerve

Origin of Serratus Anterior

-External surface of medial border of ribs

What muscle is called “the punching muscle”?

Serratus Anterior

Serratus Anterior Insertion

-Anterior surface of medial border of scapula

Serratus Anterior Action

-Protracts & laterally rotates the scapula. Holds scapula against thoracic wall

Serratus Anterior Nerve Supply

-Long thoracic nerve

What muscle is weak or paralyzed if there is winging of the scapula?

Serratus Anterior

What nerve would be affected if there is winging the scapula?

Long thoracic nerve

What does the pneumonic “SALT” stand for?

Serratus

Anterior

Long

Thoracic

Origin of the Pectoralis Major

-Medial half of clavicle

-Sternum

-First 6 costal cartilage -Sponeurosis of external oblique

Pectoralis Major Insertion

-Lateral lip of intertubercular groove of humerus

Pectoralis Major Action

-Adducts & flexes the arm & rotates arm medially, draws scapula anteriorly & inferiorly

Pectoralis Major Nerve Supply

-Medial & Lateral pectoral nerves

Origin of Pectoralis Minor

-External surfaces of third, fourth & fifth ribs

Pectoralis Minor Insertion

-Coracoid process of scapula

Pectoralis Minor Action

-Stabilizes scapula by drawing it inferiorly & anteriorly against the scapula

Pectoralis Minor Nerve Supply

-Medial pectoral nerve

Origin of Latissimus Dorsi

-Spinous processes of T6-T12 vertebrae

-Thoracolumbar fascia

-Iliac crest

-Inferior 3 or 4 ribs

-Inferior angle of scapula

Latissimus Dorsi Insertion

-Floor of intertubercular sulcus of humerus

Latissimus Dorsi Action

-Extends, adducts & medially rotates arm

-Accessory muscle of respiration 

-Raises body towards arms 

-Retraction & downward rotation of scapula

Latissimus Dorsi Nerve Supply

-Thoracodorsal nerve

What muscle is called the “climbing muscle”?

Latissimus Dorsi