Shoulder/Back Anatomy

Question 1

Trapezius

Answer 1

O: Up: Base of the skull, ligamentum nuchae
Mid: Spinous process C7-T3
Lwr: Spinous process T4-T12

I: Up: lat 1/3 of clavicle
Mid: acromion, scapular spine
Low: base of the spine

N: Spinal root of accessory (C3-4)

F: Up: elevation, up rotation
Middle: retraction
Lwr: depression, up rotation

Question 2

Levator Scapulae

Answer 2

O: Post tubercles of transverse processes of C1-C4

I: Superior angle and sup portion of med border of scapula

N: Dorsal scapular (C5), and cervical (C4,5)

F: Elevates scapula, some downward rotation

Question 3

Rhomboid Minor

Answer 3

O: Inferior ligamentum nuchae, spinous processes C7-T1

I: Med border of scapula at the base of the spine

N: Dorsal scapular (C4, 5)

F: Retraction, downward rotation, elevation

Question 4

Rhomboid Major

Answer 4

O: Spinous processes of T2-T5

I: Med border of the scapula, inferior to rhomboid minor insertion

N: Dorsal scapular (C4, 5)

F: Retraction, downward rotation, elevation

Question 5

Serratus Anterior

Answer 5

O: External surface of lateral ribs 1-8

I: Anterior surface of medial border of the scapula (inf 5/8ths)

N: Long thoracic nerve (C5-7)

F: Protraction, upward rotation, and stabilization

Question 6

Pectoralis Minor

Answer 6

O: Superior margin, external surfaces of ribs 3-5

I: Medial border and superior surface of coracoid process

N: Medial pectoral (C8, T1)

F: Protraction, downward rotation, depression

Question 7

Subclavius

Answer 7

O: Junction of the first rib and costal cartilage

I: Inferior surface of middle third of clavicle

N: Nerve branch from brachial plexus (C5-6)

F: Anchors and depresses the clavicle

Question 8

Supraspinatus

Answer 8

O: Supraspinous fossa of scapula

I: Superior aspect of greater tubercle of the humerus

N: Suprascapular (C4-6)

F: Abduction of the arm

Question 9

Infraspinatus

Answer 9

O: Infraspinous fossa of the scapula

I: Middle aspect on greater tubercle of the humerus (>post)

N: Suprascapular (C4-6)

F: Laterally rotates arm

Question 10

Teres Minor

Answer 10

O: Superior 2/3rds of dorsal surface of lateral border of the scapula

I: Inferior aspect of the greater tubercle (>post)

N: Axillary (C5-6)

F: Laterally rotates arm

Question 11

Subscapularis (Shoulder joint muscles)

Answer 11

O: Medial 2/3rds of subscapular fossa

I: Lesser tubercle of the humerus

N: Upper and lower subscapular (C5-C7)

F: Medially rotates arm

Question 12

Deltoid (anterior)

Answer 12

O: Anterior aspect of lateral 1/3 of clavicle

I: Deltoid tuberosity

N: Axillary (C5-6)

F: Medial rotation, flexion, horizontal adduction, adduction

Question 13

Deltoid (medial)

Answer 13

O: Lateral aspect of acromion

I: Deltoid tuberosity

N: Axillary (C5-6)

F: Abduction

Question 14

Deltoid (posterior)

Answer 14

O: Inferior spine of the scapula

I: Deltoid tuberosity

N: Axillary (C5-C6)

F: Lateral rotation, extension, horizontal adduction, adduction

Question 15

Latissimus Dorsi

Answer 15

O: Spinous processes of T7-T12, thoracolumbar fascia, iliac crest and inf 3-4 ribs

I: Medial lip and floor of the bicipital groove

N: Thoracodorsal (C6-8)

F: Extension, adduction, medial rotation, horizontal abduction

Question 16

Teres Major

Answer 16

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

I: Medial lip of bicipital groove

N: Lower subscapular (C6-7)

F: Extension, adduction, medial rotation, horizontal abduction

Question 17

Pectoralis Major

Answer 17

O: Clavicular head: anterior asepct of medial 2/3 of clavicle

I: Lateral lip of bicipital groove

N: Medial and lateral pectoral nerve (C5-C8)

F: Adduction, medial rotation, horizontal adduction
Clav-Flexion
Stern- Extension

Question 18

Triceps Brachii

Answer 18

O: Long= infraglenoid tubercle
Lat = posterior aspect of humerus, post, lat, sup spiral groove
Med: Post surface of humerus, inferior and medial to spiral groove

I: Proximal end of olecranon ulna and fascia fo the forearm

N: Radial (C6-8)

F: Extension of forearm
Long- Extension and adduction of humerus

Question 19

Biceps Brachii

Answer 19

O: Short: tip of coracoid process
Long: Supraglenoid tubercle

I: Radial tuberosity, fascia of forearm

N: Musculocutaneous (C5-C6)

F: Elbow flexor, forearm supinator

Weak Abduction and flexion of the humerus

Question 20

Coracobrachialis

Answer 20

O: Tip of coracoid process

I: Middle third of medial surface of the humerus

N: Musculocutaneous (C5, 6, 7)

F: Assists in flexion, adduction, horizontal adduction