Lecture 7 Material (Muscles of the Upper Extremity and Shoulder + a Bone markings Again)

Question 1

Name the origin(s), insertion(s), and the action of the Brachialis

Answer 1

O: Distal end of the humerus (anterior surface)
I: Coronoid process of the ulna (and capsule of the elbow joint)
A: Flexes the forearm

Question 2

Name the origin(s), insertion(s), and the action of the Coracobrachialis

Answer 2

O: Coracoid process of the scapula
I: Shaft of the humerus
A: Flexion of the arm and adduction at the shoulder joint

Question 3

Name the origin(s), insertion(s), and the action of the Pectoralis minor

Answer 3

O: Ribs 3-5 (anterior surf.)
I: Coracoid process of the scapula
A: Stabilization, depression, abduction, protraction of the scapula

Question 4

Name the origin(s), insertion(s), and the action of the Rhomboids major and minor

Answer 4

Rh. Major:
O: Spinous processes of T2-T5
I: Medial border of the scapula
A: Holds and retracts the scapula

Rh. Minor:
O: Spinous processes of C7-T1
I: same as Rh. Major
A: Retracts the scapula

Question 5

Name the origin(s), insertion(s), and the action of the Levator Scapulae

Answer 5

O: Transverse processes of C1-C4
I: Medial border of scapula
A: Elevates and adducts the scapula

Question 6

Name the origin(s), insertion(s), and the action of the Serratus anterior (bbq ribs lol)

Answer 6

O: Ribs 1-8
I: medial/vertebral border of the scapula (anterior surf.)
A: Elevate the ribs

Question 7

What are the SITS muscles?

Answer 7

Supraspinatus, Infraspinatus, Teres Minor, Subscapularis

Question 8

Name the origin(s), insertion(s), and the action of the Subscapularis

Answer 8

O: Subscapular fossa
I: LESSER tubercle of the humerus
A: Medial rotation of the arm

Question 9

Name the origin(s), insertion(s), and the action of the Teres Minor

Answer 9

O: Lateral border of the posterior scapula
I: GREATER tubercle of humerus
A: Lateral rotation of the arm

Question 10

Name the origin(s), insertion(s), and the action of the Infraspinatus

Answer 10

O: Infraspinous fossa
I: GREATER tubercle of humerus
A: Medial rotation of the arm

Question 11

Name the origin(s), insertion(s), and the action of the Supraspinatus

Answer 11

O: Supraspinous fossa
I: GREATER tubercle of humerus
A: Initiates ABduction of the arm

Question 12

Name the origin(s), insertion(s), and the action of the Deltoid

Answer 12

O: Lateral third of clavicle, acromion, spine of scapula
I: DELTOID tuberosity of humerus
A: Prime mover of arm abduction

Question 13

Name the origin(s), insertion(s), and the action of the Trapezius

Answer 13

O: Occipital bone, all thoracic vertebrae, spinous processes of C7
I: Lateral third of clavicle, acromion, spine of scapula (the origin of the deltoid!)
A: Stabilizes, elevates, retracts and rotates the Scapula (just think helps with shrugging shoulders)

Question 14

Name the origin(s), insertion(s), and the action of the Lat Dorsi

Answer 14

O: Lower 3-4 ribs, iliac crest, inferior angle of scapula
I: Intertubercular sulcus too!
A: Extension of the arm at shoulder

Question 15

Name the origin(s), insertion(s), and the action of the Teres Major

Answer 15

O: inferior angle of posterior scapula
I: crest of lesser tubercle
A: Extension of the arm at shoulder and medial rotation

Question 16

Name the origin(s), insertion(s), and the action of the Pec Major

Answer 16

O: Sternal end of clavicle, sternum, cartilage of ribs 1-6
I: Intertubercular sulcus of the humerus AND greater tubercle
A: Flexion of the arm at shoulder