Week 1 Muscles

Question 1

Answer 1

Supraspinatus

O: Supraspinous fossa of scapula

I: Greater tubercle of humerus

Inner: Suprascapular Nerve

A: Abduction shoulder

Question 2

Answer 2

Infraspinatus

O: Infraspinous fossa of scapula

I: Greater tubercle of humerus

Inner: Suprascapular nerve

A: External rotation of arm

Question 3

Answer 3

Teres Minor

O: Middle Part of lateral border of scapula

I: Greater tubercle of humerus

Inner: Axillary Nerve

A: External rotation of arm

Question 4

Answer 4

Subscapularis

O: Subscapular fossa of scapula

I: Lesser tubercle of humerus

Inner: Upper subscapular nerve & lower subscapular nerve

A: Internal rotation of arm

Question 5

Answer 5

Latissimus Dorsi

O: Spinous process T7-T12, Thoracolumbar fascia, iliac crest, Last 3 ribs, and inferior angle of scapula

I: Floor of the intertubercular groove of the humerus

Inner: Thoracodorsal Nerve

A: Exention, Adduction, internal rotation of shoulder.

Depression, downward rotation scapula

Question 6

Answer 6

Teres Major

O: Posterior surface of inferior angle of scapula, lateral border of scapula

I: Crest of lesser tubercle of humerus

Inner: Lower subscapular nerve

A: Adduction, internal rotation of shoulder

Question 7

Answer 7

Triceps Brachii

O:

• Long head- infraglenoid tubercle of the scapula
• Medial head- posterior medial humerus
• Lateral head- posterior lateral humerus

I: Olecranon process of ulna

Inner: Radial Nerve

A: Long Head: Extension, adduction at shoulder.

-Elbow extension

Question 8

Answer 8

Deltoid

O: Lateral 1/3 clavicle, acromion, spine of scapula

I: Deltoid tuberosity of humerus

Inner: Axillary nerve

A: Abduction (middle fibers), Flexion & internal rotation (anterior fibers), Extension & external rotation (posterior fibers)

Question 9

Answer 9

Pectoralis Major

O: Medial 1/2 of clavicle (head), sternal cartilage of ribs 1-6 (sternocostal head)

I: Crest of greater tubercle of humerus

Inner: Medial pectoral nerve, lateral pectoral nerve

A: Adduction, internal rotation and flexion of shoulder

Question 10

Answer 10

Bicpes Brachii (Long & short head)

O: Long - supraglenoid tubercle of scapula, Short - coracoid process of scapula

I: Radial tuberosity via bicipital aponeurosis

Inner: Musculocutaneous Nervei

A: Shoulder: Flexion (both), Adduction (short), Abduction (long), Forearm: Supinator of forearm,

Flexion of elbow (most effective when forearm is supinated)

Question 11

Answer 11

Coracobrachialis

O: Coracoid process of scapula

I: Middle third of medial shaft of humerus

Inner: Musculocutaneous Nerve

A: Flexion, adduction shoudler

Question 12

Answer 12

Pectoralis Minor

O: Ribs 3, 4 and 5

I: Coracoid process of scapula

Inner: Medial pectoral nerve

A: Depression, downward roation of scapula

Question 13

Answer 13

Serratus Anterior

O: External surface of ribs 1-8

I: Anterior surface of medial border of scapula

Inner: Long thoractracic nerve

A: Protraction, upward rotation of scapula

Question 14

Answer 14

Trapezius

O: Skull, nuchal ligament, spinous process C7-T12

I: Lateral 1/3 clavicle, acromion, spine of the scapula

Inner: Accessory Nerve (Cranial Nerve XI)

A: Elevaltion, upward rotation (Upper fibers), Retraction (middle fibers), Depression, upward rotation (lower fibers).

Question 15

Answer 15

Rhomboid Minor

O: spinous process C7-T1 vertebrae

I: Medial border of scapula at the spine of the scapula

Inner: Dorsal scapular

A: Retraction, elevation, downward rotation scapula

Question 16

Answer 16

Rhomboid Major

O: spinous process T2-T5 vertebrae

I: Medial border of scapula at the spine of the scapula, inferior angle

Inner: Dorsal scapular

A: Retraction, elevation, downward rotation scapula

Question 17

Answer 17

Levator Scapulae

O: Transverse processes C1-C4

I: Medial border of scapula b/t superior angle and spine of the scapula

Inner: Dorsal scapular

A: Elevation