Shoulder Articulations, Movements, Purpose, Etc.. Pt 2

rhomboid major origin

2 to 5 thoracic spines and supraspinous ligaments

rhomboid major insertion

Medial border of scapula

Dorsal scapular nerve

rhomboid major is innervated by..

rhomboid major action

• Elevates medial border of scapula

• Pulls scapula medially

deltoid origin (anterior fibers)

lateral 1/3 and anterior border of clavicle

deltoid origin (middle fibers)

lateral border of acromion

deltoid origin (posterior fibers)

lower border of spine of scapula

deltoid insertion

Middle of the lateral surface of shaft of humerus

Axillary nerve

deltoid is innervated by..

deltoid action

• Abducts upper limb at shoulder

• Anterior fibers- shoulder flexion

• Posterior Fibers- shoulder extension

supraspinatus origin

supraspinous fossa of scapula

supraspinatus insertion

upper facet of greater tuberosity of humerus into capsule of shoulder joint

suprascapular nerve

supraspinatus is innervated by..

supraspinatus action

• assists deltoid in abduction of arm at shoulder joint by flexxing head of humerus against glenoid cavity

• internally rotates arm with overhead motions

infraspinatus origin

infraspinous fossa of scapula

infraspinatus insertion

middle facet of greater tuberosity of humerus into capsule of shoulder join

suprascapular nerve

infraspinatus is innervated by..

infraspinatus action

laterally and externally rotates arm; stabilizes shoulder joint

teres minor origin

upper two-thirds of posterior surface of lateral border of scapula

teres minor insertion

lower facet of greater tuberosity of humerus into capsule of shoulder joint

axillary nerve

teres minor is innervated by..

teres minor action

externally rotates arm stabilizes shoulder joint

subscapularis origin

Subscapular fossa

( anterior surface of scapula)

tendon to lesser tuberosity of humerus

subscapularis inserted at..

Upper & Lower subscapular nerves

• (Branches of posterior cord of brachial plexus)

subscapularis is innervated by..

subscapularis action

Medially rotates arm

pectoralis major origin

from medial half of clavicle, from sternum, and from upper 6 costalcartilages

pectoralis major insertion

tendon into lateral lip of bicipital groove of humerus

medial and lateral pectoral nerves

(from medial and lateral cords of brachial plexus)

pectoralis major is innervated by..

pectoralis major action

• adducts and medially rotates arm

• anterior fibers flex arm

subclavius origin

from first costal cartilage

groove on inferior of surface of clavicle

subclavius inserts at..

nerve to subclavius/subclavian nerve

(from upper trunk of brachial plexus)

subclavius is innervated by..

subclavius action

depresses clavicle and steadies bone during movements of shoulder girdle

pectoralis minor origin

From anterior 3rd, 4th, and 5th ribs

pectoralis minor insertion

medial border of coracoid process

Medial pectoral nerve

(a branch of the medial cord of the brachial plexus)

pectoralis minor is innervated by..

pectoralis minor action

Pulls shoulder downward and forward

teres major origin

lateral border of scapula

• Lower 1/3 of posterior surface

teres major insertion

Medial lip of bicipital groove of humerus

Lower subscapular nerve

(arising from Roots C5, 6 &7)

teres major is innervated by..

teres major action

Medially rotates and adducts arm

serratus anterior origin

Outer surfaces of upper 8 ribs

serratus anterior insertion

Anterior surface of medial border of scapula, inferior angle

Long thoracic nerve

(arising from roots C5, 6, & 7)

serratus anterior is innervated by..

serratus anterior action

• Draws scapula forward around thoracic wall

• Rotates scapula, raising glenoid fossa

• Protracton