AOI's practical 1

Question 1

Pectoralis major

Answer 1

action: adduction of arm, extension of arm, flexion of arm, medial rotation of arm
origin: clavicle, sternum, costal cartilages 1-6, aponeurosis of external abdominal oblique muscle
inception: humerus [intertubercular sulcus]

Question 2

latissimus dorsi

Answer 2

action: adduction of arm, extension of arm, medial rotation of arm
origin: sacral and lumbar spine, iliac crest, thoracolumbar fascia, ribs 9-12, scapula (inferior angle), spinous process of T6-12 vertebrae
insertion: humerus [intertubercular sulcus]

Question 3

deltoid

Answer 3

action: flexion and medial rotation of arm, abduction of arm, extension and lateral rotation of arm
origin: clavicle (lateral 1/3), scapula (acromion and spine)
insertion: humerus [deltoid tuberosity]

Question 4

trapezium [eads]

Answer 4

action: elevation, adduction, depression and superior rotation of scapula
origin: occipital bone (superior nuchal line), spinous process of C7 and T1-12 vertebrae
insertion: clavicle (lateral 1/3), scapula (Acromion and spine)

Question 5

pectoralis minor [sal]

Answer 5

action: stabilizes, abducts and laterally rotates scapula
origin: ribs 3-5
insertion: scapula (coracoid process)

Question 6

external oblique

Answer 6

action: flexion and rotation of trunk; compression of abdominal wall & viscera
origin: ribs and costal cartilage 5-12
insertion: iliac crest and linea alba

Question 7

internal oblique

Answer 7

action: flexion and rotation of trunk; compression of abdominal wall and viscera
origin: inguinal ligament, iliac crest, thoracolumbar fascia
insertion: costal cartilage 7-10, linea alba

Question 8

transverse abdominis

Answer 8

action: compression of abdominal wall and viscera
origin: inguinal ligament, iliac crest, thoracolumbar fascia, costal cartilage 7-12
insertion: pubis, linea alba, xyphoid process of sternum

Question 9

brachioradialis

Answer 9

action: flexion of forearm, supination of forearm(when pronated), pronation of forearm (when supinated)
origin: humerus ( lateral distal shaft )
insertion: radius ( styloid process )

Question 10

pronator teres

Answer 10

action: pronation of forearm
origin: humerus (medial epicondyle), ulna (coracoid process)
insertion: radius ( lateral mid shaft )

Question 11

flexor carpi radialis

Answer 11

action: abduction of hand, flexion of wrist
origin: humerus (medial epicondyle)
insertion: metacarpals II and III (base)

Question 12

palmaris longus

Answer 12

action: flexion of wrist (weak) ; tense palmar aponeurosis
origin: humerus (medial epicondyle)
insertion: palmar aponeurosis

Question 13

flexor carpi ulnaris

Answer 13

action: flexion of wrist, abduction of arm
origin: humerus (medial epicondyle), ulna (olecranon and posterior border of ulna)
insertion: pisiform and hamate, carpal bones, metacarpal V (base)

Question 14

extensor carpi radialis longus

Answer 14

action: extension of wrist, abduction of hand
origin: humerus ( lateral supracondylar ridge)
insertion: metacarpal II (base)

Question 15

extensor carpi radialis brevis

Answer 15

action: extension of wrist, abduction of hand
origin: humerus ( lateral epicondyle )
insertion: metacarpal III

Question 16

extensor digitorium

Answer 16

action: extension of fingers 2-5, extension of wrist
origin: humerus (lateral epicondyle )
insertion: middle and distal phalanges of fingers 2-5

Question 17

extensor carpi ulnaris

Answer 17

action: extension of wrist, adduction of hand
origin: humerus (lateral epicondyle), ulna (posterior shaft)
insertion: metacarpal V (base)

Question 18

flexor pollicis longus

Answer 18

action: flexion of thumb
origin: radius (anterior mid shaft), interosseous membrane , ulna (coronoid process)
insertion: distal phalanx of thumb

Question 19

flexor digitorum profundus

Answer 19

action: flexion of fingers 2-5, flexion of wrist and metacarpophalangeal joints
origin: ulna (proximal anterior shaft), interosseous membrane
insertion: distal phalanges 2-5

Question 20

abductor pollicis longus

Answer 20

action: abduction and extension of thumb
origin: ulna (both proximal and posterior) interosseous membrane
insertion: Metacarpal I (base)

Question 21

extensor pollicis longus

Answer 21

action: extension of thumb
origin: ulna (posterior mid shaft) interosseous membrane
insertion: distal phalanx of thumb

Question 22

supinator

Answer 22

action: supination of forearm
origin: ulna (posterior proximal shaft), interosseous membrane
insertion: radius (lateral proximal shaft)

Question 23

abductor pollicis brevis

Answer 23

action: abduction of thumb
origin: trapezium, scaphoid, flexion of retinaculum
insertion: proximal phalanx of thumb

Question 24

flexor pollicis brevis

Answer 24

action: flexion of thumb
origin: trapezium, trapezoid & capitate and flexor retinaculum
insertion: proximal phalanx of thumb