Muscles

Question 1

Deltoid

Answer 1

Shoulder muscle

Origin:
-Lateral 1/3rd of clavicle
-Acromion and spine of the scapula

Insertion: Deltoid tuberosity in humerus

Action:
-Clavicle portion: flex arm at shoulder (sideways) And medially rotates arm
-Acromion part: ABduction of arm at shoulder beyond 15 degrees

Question 2

Biceps brachii

Answer 2

Bicep

Origin:
long head: supraglenoid tubercle of the scapula
short head: coracoid process of scapula

Insertion: Radial tuberosity of radius

Action:
-Flex arm at shoulder
-flex arm at elbow
-supinates forearm at elbow

Question 3

Triceps brachii

Answer 3

Triceps

Origin: Infraglenoid tubercle of the scapula

Insertion: Posterior olecranon process of ulna

Action: extends the forearm at elbow

Question 4

Pectoralis major

Answer 4

Pecs

Origin: Medial half of Clavicle and Sternum with costal cartilages

Insertion:
-lateral lip of intertubercular groove of humerus
-crest of greater tubercle of humerus

Action:
Sternum portion: extend arm at shoulder
Clavicle portion: Flex arm at shoulder
Both: Medially rotates the arm and adducts arm at shoulder

Question 5

Subscapularis

Answer 5

Front middle portion of scapula

Origin: Subscapular fossa of scapula

Insertion: Lesser tubercle of humerus

Action: Adducts the humerus? and internally rotates it

Question 6

Supraspinatus

Answer 6

Top muscle on scapula

Origin: Supraspinous fossa of the scapula

Insertion: superior aspect of the greater tubercle of the humerus

Action: abduction of the arm at the shoulder

Question 7

Infraspinatus

Answer 7

Back main portion of scapula

Origin: Infraspinous fossa of the scapula

Insertion: Middle part of the greater tubercle of the humerus

Action: Laterally rotates the arm

Question 8

Teres major

Answer 8

On the bottom part of the scapula

Origin: Lower lateral border and inferior angle of scapula

Insertion: Medial lip of the intertubercular groove of anterior humerus

Action:
-adducts the arm at shoulder
-medially rotates arm at shoulder
-extends arm at shoulder

Question 9

Teres minor

Answer 9

Back side of the scapula (more shown there) at the bottom

Origin: Middle part of lateral axillary of scapula

Insertion: Inferior aspect of greater tubercle of humerus

Action: Laterally rotates the arm at shoulder and weakly adducts the arm

Question 10

Latissimus dorsi

Answer 10

Sides of lower back

Origin: Vertebrae, sacrum, scapula, lower 3 or 4 ribs

Insertion: Floor of intertubercular groove of humerus

Action:
-Adducts arm at shoulder
-Medially rotates arm
-Extends arm

Question 11

Extensor carpi ulni

Answer 11

In arm

Origin: Lateral epicondyle of humerus

Insertion: Base of 5th metacarpal

Action:
-Extends hand at wrist
-Adducts hand at wrist

Question 12

Brachioradialis

Answer 12

Whole radius side of arm

Origin: Lateral supracondylar ridge of humerus

Insertion: Styloid process of radius

Action: Flexes forearm at elbow

Question 13

Pronator teres

Answer 13

Starts at ulna side but goes under brachioradialis

Origin:
-Humeral head: medial epicondyle of humerus & distal supracondylar ridge
-Ulnar head: medial side of coronoid process of ulna.

Insertion: Middle of lateral surface of radius

Action:
-Pronates the forearm (twist)
-flexes the forearm at elbow

Question 14

Brachilais

Answer 14

In between bicep and tricep

Origin: Anterior distal half of humerus

Insertion: Coronoid process and tuberosity of ulna

Action: Flexes forearm at elbow

Question 15

Supinator

Answer 15

no clue

Origin:
-Lateral epicondyle of humerus
-Supinator crest of ulna

Insertion: Lateral, posterior and anterior surfaces of proximal 1/3 of radius

Action: supinate forearm

Question 16

Trapezius

Answer 16

Neck to middle of back, dorito shape

Origin:
-Descending part: Superior nuchal line of occiptial bone
-Transverse part: Spinous processes of the vertebra
-Ascending part: Spinous processes of the thoracic vertebrae

Insertion:
-Descending part: Lateral third of the clavicle
-Transverse part: Acromion of the scapula;
Spine of the scapula
-Ascending part: Medial part of the spine of the scapula

Action:
Depression and elevation of shoulder
Medially rotates arm

Question 17

Tendon

Answer 17

Muscle to bone

Question 18

Fascia

Answer 18

fibrous connective tissue

Question 19

Aponeurosis

Answer 19

a thin sheet of fascia that attaches some muscles to bone

Question 20

Insertion

Answer 20

The attachment of tendon or aponeurosis to bone that is moved

Question 21

Origin

Answer 21

The attachment of the tendon or aponeurosis to bone that serves as an anchor