Shoulder muscles

Question 1

Role of rotator cuff muscles and movements

Answer 1

-maintain position of humeral head in the glenoid fossa
-flexion, abduction, internall and external

Question 2

4 main rotator cuff muscles

Answer 2

-supraspinatus
-infraspinatus
-subscapularis
-teres minor

Question 3

origin and insertion of subscapularis (GH JOINT MUSCLE)

Answer 3

-originates at subscapular fossa
-inserts at lesser tubercle of humerus

Question 4

O AND I of supraspinatus (GH JOINT MUSCLE)

Answer 4

originates at supraspinous fossa of scapula
inserts at greater tubercle of humerus
External and internal rotation

Question 5

O and I of infraspinatus (GH JOINT MUSCLE)

Answer 5

originates at infraspinatus fossa
inserts at tuberosity of the humerus
External rotation of humerus and stabilisation of glenohumeral joint

Question 6

O and I of Teres minor (GH JOINT MUSCLE)

Answer 6

originates at posterior surface of scap
inserts at greater tubercle of humerus
Stabilises glenohumeral joint
External rotation

Question 7

O and I of bicep brachii (GH JOINT MUSCLE)

Answer 7

Comprised of 2 heads, long and short
-long originates at supraglenoid tubercle and inserts at radial tuberosity of fascia
-short originates at coracoid process of scapula and inserts at radial tuberosity of fascia
-FLEXOR

Question 8

O and I of tricep brachii (GH JOINT MUSCLE)

Answer 8

-3 heads, lateral, medial, and long
-lateral originates at humerus, inserts at olacranon of the ulna
-medial originates at humerus, inserts at olacranon of the ulna
-long originates at infraglenoid tubercle of scapula, inserts at olacranon of the ulna
Main function= extension of elbow joint

Question 9

O and I of Serratus anterior (SCAPULOTHORACIC JOINT MUSCLE)

Answer 9

-orignates at superolateral surfaces of first to eighth ribs at lateral wall of thorax, inserts along superior angle, medial border, inferior angle of scapula
-Protraction and upward rotation

Question 10

O and I of levator scapulae (SCAPULOTHORACIC JOINT MUSCLE)

Answer 10

-originates from transverse processes of first four cervical vertebrae, inserts at superior angle and medial border of scapula
-Elevation, downward rotation

Question 11

O and I of deltoids (GH JOINT MUSCLE)

Answer 11

originates at lateral part of clavicle and spine and acromion process of the scapula, inserts at deltoid tuberosity of the humerus
-Flexion AND extension

Question 12

O and I of coracobrachialis ( GH JOINT MUSCLE)

Answer 12

-originates at coracoid process of scapula, inserts at anteromedial surfaces of humeral shaft
-Flexion

Question 13

O and I of Pectoralis (GH JOINT MUSCLE)

Answer 13

-MINOR originates at 3rd- 5th ribs and inserts at coracoid process of scapula
-MAJOR has 2 heads, sternocostal and clavicular
-Clavicular originates anterior surface of medial half of clavicle
-Sternocostal originates at anterior surface of sternum
-both inserts at crest of greater tubercle of humerus
- FLEXION AND ADDUCTION AND INTERNAL ROTATION

Question 14

O and I of latissimus dorsi (GH JOINT MUSCLE)

Answer 14

-Originates at spinous processes of thoracic spine T7-T12, Iliac crest, thoracolumbar fascia, inferior angle of scapula, inserts at intertubercular groove of humerus
-EXTENSION, ADDUCTION, INTERNAL ROTATION

Question 15

O and I of serratus (SCAPULOTHORACIC JOINT MUSCLE)

Answer 15

-originates at superolateral surfaces of first to 8th ribs at lateral wall of thorax, inserts along superior angle, medial border and inferior angle of the scapula
-PROTRACTION (anterior) AND UPWARD ROTATION (anterior)
-

Question 16

O and I of Rhomboids (SCAPULOTHORACIC JOINT MUSCLE)

Answer 16

-originates from spinous processes T2-T5 and inserts at medial border of scap
-RETRACTION, DOWNWARD ROTATION

Question 17

O and I of trapezius (SCAPULOTHORACIC JOINT MUSCLE)

Answer 17

originates from occipital bone, (base of skull), superior nuchal line, inserts at clavicle, acromion and scapula spine
-RETRATION, ELEVATION, DEPRESSION AND UPWARD ROTATION

Question 18

O and I of scalenes (shoulder and neck muscle)

Answer 18

originates at transverse processes of cervical vertebrae, inserts into scalene muscle tubercle of upper face of first rib

Question 19

O and I of sternocleidomastoid (neck and shoulder muscle

Answer 19

originates at manubrium of sternum and clavicle, insertsat mastoid process of temporal bone
-LATERAL FLEXION, FLEXION AND ROTATION

Question 20

O and I of levator scapulae (shoulder and neck)

Answer 20

-originates at transverse processes of first four cervical vertebrae, inserts at superior angle and medial border of scapula
-LATERAL FLEXION