Anatomy lec 7 for MT

Name O(4),I(2),A (3)for Pectoralis major

Large, fan shaped

O: Sternal end of clavicle,
Sternum
Cartilage of ribs 1-6
Apopneurosis of external oblique muscle

I:Intertubercular sulcus
Greater tubercle of humerus

A:“Cross your arms”
Adducts arm
Medially rotates arm

Flexes arm at shoulder

Inserts on humerus so moves humerus

Name O(5),I(1),A(3) for latismus dorsi

o:

Inferior angle of scapula
Lower 3 ribs
Lower six thoracic vertebrae
All lumbar
Iliac crest

SO: lower back to front of arm

i:Floor of intertubercular sulcus

A:“Swimming”
“Wall climbing”

Adducts arm
Medially rotates arm

Extends arm at shoulder

Inserts on humerus so moves humerus

Name O(1),I(1),A (3)for Teres major

o: Inferior angle at posterior scapula

I:Crest of lesser tubercle on anterior humerus

A:Adducts arm
Medially rotates arm

Extends arm at shoulder

Helper/synergist to lats

Trapezius

o-4

i-3

a-4

o:Occipital bone

Ligamentum nuchae (neck)

Spinous processes of C7

All thoracic vertebrae

Midline origin

I:Continuous insertion along:

Acromion
Spine of scapula
Lateral third of clavicle

Lateral insertion

A; Stabilize scapula

Elevate scapula

Retract scapula

Rotate scapula

Deltoid

o-3

i-1

a-1

o:

Acromion
Spine of scapula

Lateral third of clavicle

Opposite insertion of trapezius

I:Deltoid tuberosity of humerus

A:*Prime mover of arm abduction

Supraspinatus

o-1

i-1

a-1

o: Supraspinous fossa of scapula

I:Greater tubercle of humerus

A:Abducts arm

Infraspinatus

o-1

i-1

a-1

O:Infraspinous fossa of scapula (posterior)

I:Greater tubercle (humerus)

A:Laterally rotates arm

Teres minor

o-1

i-1

a-1

O:Lateral border of scapula (posterior)

I:Greater tubercle (humerus) (behind infraspinous)

A:Laterally rotates arm

Subscapularis

O:Subscapular fossa of scapula (anterior)

I:Lesser tubercle (humerus)

A: Medially rotates arm

Serratus anterior

o-1

i-1

a-3

O:Series of muscle slips from 1-8

I:Medial border of scapula (anterior)
(entire surface)

A:controls shoulder blade movement,

stabilizes the upper body,

and supports breathing

Levator scapulae

o-1

i-1

a-2

O: Transverse processes of C1 - C4

I:Medial border of scapula (superior to spine)

A:Elevates scapula

Adducts scapula

Rhomboid minor

O:Spinous processes of C7 & T1

I: Medial border of scapula

A:Stabilize scapula

Rhomboid major

O: Spinous processes of T2-T5

I: Medial border of scapula

A: Stabilize scapula

Pectoralis minor

O:Surface of ribs 3-5 (anterior)

I:Coracoid process of scapula

A:pulls the shoulder blade (scapula) forward and downward against the chest wall.

Coracobrachialis

O:Coracoid process of scapula

I:Medial surface of humerus shaft

A:“Wave” arm Flex arm Adduct arm