Pectoral Region OINA

Question 1

Pectoralis Major

Answer 1

O: clavicle, sternum, aponeurosis of external oblique, ribs 1-6

I: crest of greater tubercle of humerus

N: lateral + medial pectoral nerves

A: adducts, flexes, extends (when flexed, not backwards), medially rotates arm

Question 2

Pectoralis Minor

Answer 2

O: ribs 3-5 (costochondral junction)

I: Coracoid process

N: medial pectoral

A: depress scapula, elevate ribs

Question 3

Subclavius

Answer 3

O: 1st rib (costochondral junction)

I: inferior acromial end of clavicle

N: subclavian

A: flexes clavicle or elevates rib 1

Question 4

Serratus Anterior

Answer 4

O: ribs 1-8(9)

I: deep medial border of the scapula

N: long thoracic

A: rotate and protract scapula (pulls medial border forward), elevate ribs

Question 5

Trapezius

Answer 5

O: occipital protuberance - T12 nuchal ligament

I: superior margin of scapular spine and clavicle

N: accessory and cervical plexus

A: rotate scapula, abduct and extend head

Question 6

Levator Scapulae

Answer 6

O: transverse processes C1-4

I: superior angle of scapula

N: dorsal scapular

A: elevate scapula

Question 7

Rhomboideus Minor

Answer 7

O: spinous processes C7-T1

I: medial border of scapula at spine

N: dorsal scapular

A: retracts and elevates scapula

Question 8

Rhomboideus Major

Answer 8

O: spinous processes T1-4

I: medial border of scapula inferior to spine

N: dorsal scapular

A: retracts and rotates scapula