Major Upper Body Muscles

Question 1

Origin, insertion, action and innervation of trap?

Answer 1

External occipital protuberance, superior unchallenged line and spinous process of c7-t12
Lateral clavicle, acromion, scapular spine
Upper: elevate and upward rotation of scapula, extend neck side bend
Middle: retract or adduct scapula
Lower: depress and help upward rotation of scapula
Spinal accessory

Question 2

Origin, insertion, action and innervation of lat?

Answer 2

Spinous process of t7-l5, 9-12 ribs, iliac crest
Bicipital groove
Adduct, IR and extend humerus
Thoracodorsal

Question 3

Origin, insertion, action and innervation of rhomboid minor?

Answer 3

Spinous process of c7-t1
Medial border of scapula at spine
Retract and downward rotation of scapula
Dorsal scapula

Question 4

Origin, insertion, action and innervation of rhomboid major?

Answer 4

Spinous process of t2-t5
Medial border of scapula adjacent to infraspinous process
Retract and downward rotation of scapula
Dorsal scapular

Question 5

Origin, insertion, action and innervation of serratus anterior?

Answer 5

1-9 ribs
Medial border of scapula
Protract and upward rotation of scapula
Long thoracic nerve

Question 6

Origin, insertion, action and innervation of pec minor?

Answer 6

Anterior 3-5 ribs
Coracoid process of scapula
Protract and downward rotation of scapula
Medial and lateral pec nerves

Question 7

Origin, insertion, action and innervation of pec major?

Answer 7

Medial clavicle, manubrium, body of sternum, 1-6 costal cartilage
Crest of greater tubercle of humerus
Adduct, IR, transversely adduct arm, depress scapula
Medial and lateral pec nerves