CH 13: Upper Limb Muscles

Question 1

Need to know ID, Origin and Insertion, and Action: Trapezius (2+3+3)

Answer 1

origin: occipital bone and thoracic vertebrae

insertion: acromion and spinous process of scapula, clavicle

action: scapular rotation (elevation/lateral), retraction, stabilize

Question 2

Need to know ID, Origin and Insertion, and Action: Latissmus Dorsi (5+1+3)

Answer 2

origin: inferior thoracic and lumbar vertebrae, inferior scapula,inferior ribs, iliac crest

insertion: intertubercular sulcus

function: arm extension, adduction, medial rotation

Question 3

Need to know ID,and Action: Rhomboideus Major + Minor

Answer 3

smaller and superior + stabilize scapula with retraction

Question 4

Need to know ID, Origin and Insertion, and Action: Pectoralis Major

Answer 4

origin: across clavicle and sternum

insertion: intertubercular sulcus

action: assist in medial rotation, arm flexion, adduction

Question 5

Need to know ID, and Action: Pec minor

Answer 5

ID: deeper

action: protraction and depression of scapula

Question 6

Need to know ID, Origin and Insertion, and Action: Serratus Anterior

Answer 6

origin: first 8 ribs

insertion: superior and inferior angles and medial border of scapula

action: moves scapula + rotation and protraction of scapula