Muscles of M100

Question 1

ORIGIN:
short head- coracoid
Long head- supraglenoid tubercle of scapula (going up through bicipital groove)
INSERTION:
Radial tuberosity & bicipital aponeurosis
ACTION:
*Flexion of humerus (humeroulnar joint)
*Flexion of elbow (glenohumeral joint)
*Supination of forearm (radioulnar joint)

Answer 1

Biceps Brachii

Question 2

ORIGIN:
Infraglenoid Tubercle of Scapula
INSERTION:
Olecranon process of ulna
ACTIONS:
*All heads: extension of elbow (humeroulnar joint)
*Long head: extension of humerus (glenohumeral joint)
*Long head: addiction of the shoulder (glenohumeral joint)

Answer 2

Triceps Brachii

Question 3

ORIGIN:
Lateral Epicondyle of humerus
INSERTION:
Olecranon process of ulna
ACTION:
Extension of elbow (humeroulnar joint)

Answer 3

Anconeus

Question 4

ORIGIN:
Anterior shaft of humerus
INSERTION:
Ulnar tuberosity
ACTION:
Flexion of the elbow (humeroulnar joint)

Answer 4

Brachialis

Question 5

ORIGIN:
Lateral Supracondylar Ridge of humerus
INSERTION:
Styloid process of radius
ACTIONS:
*Flexion of the elbow in neutral position (humeroulnar joint)
*Assist to probate and supinate the forearm when these movements are resisted

Answer 5

Brachioradialis

Question 6

ORIGIN:
Coracoid Process of the scapula
INSERTION:
Medial surface of the mid-numeral shaft
ACTIONS
*Flexion of the shoulder
*adduction of the shoulder
(Glenohumeral joint)

Answer 6

Coracobrachialis

Question 7

ORIGIN:
Lateral epicondyle of the humerus & ligamentous tissues around the ulna
INSERTION:
Anterior, lateral surface of proximal 1/3 of radial shaft
ACTION:
Supinates the forearm at the radioulnar joint

Answer 7

Supinator

Question 8

ORIGIN:
Humeral head- medial epicondyle of the humerus
Ulnar head- Coronoid process of the ulna
INSERTION:
Middle of the lateral surface of the radius
ACTIONS:
*Pronation of the forearm (radioulnar joint)
*Assists to flex the elbow

Answer 8

Pronation Teres

Question 9

ORIGIN:
Medial, anterior surface of the distal ulna
INSERTION:
Lateral, anterior surface of the distal radius
ACTION:
Pronates the forearm at the distal radioulnar joint

Answer 9

Pronator Quadratus

Question 10

ORIGIN:
Inferior border of the rib above
INSERTION:
Superior border of the rib below
ACTIONS:
*External: elevate the ribs in inhalation
*Internal: Depress ribs in exhalation
*Both: maintain spaces

Answer 10

Intercostals

Question 11

ORIGIN:
Inferior border of the rib above
INSERTION:
Costal cartilage of ribs 5,6,7 & Xiphoid process
ACTIONS:
*Flexion of the trunk
*Posterior pelvic tilt
*Supports compression of abdominal contents

Answer 11

Rectus Abdominis

Question 12

ORIGIN:
External surface of ribs 5-12
INSERTION:
Iliac crest & abdominal aponeurosis to Linea alba
ACTIONS:
*bilaterally: Flexion of the trunk, compression of ABD contents
*unilaterally: lateral Flexion, rotation of the trunk to opposite side

Answer 12

External oblique

Question 13

ORIGIN:
Lower ribs, iliac crest, & fascia
INSERTION:
Pubic bone & linea alba
ACTION:
Compression of abdominal contents

Answer 13

Transverse Abdominis

Question 14

ORIGIN:
Iliac crest & inguinal ligament
INSERTION:
Ribs 10-12, Abdominal aponeurosis to linea alba
ACTIONS:
*Bilaterally: Flexion of trunk, compression of ABD contents
*unilaterally: lateral Flexion, rotation of trunk to same side

Answer 14

Internal Oblique