Muscles (forearm, hand/elbow, and abdominal wall) plus the Lab Quiz Flashcards
What muscles move the Forearm at the elbow?
Triceps Brachii, Biceps Brachii, and Brachialis
Triceps Brachii
A: extension of forearm; long head extends and adducts arm –> posterior
O: three because it’s a tricep (basically scapula + humerus)
1) long head: inferior margin of glenoid fossa
2) MH: posterior surface to lateral head
3) LH: posterior surface of humerus
I: olecranon process of ulna
Biceps Brachii
A: flexion and supination of forearm; flexion of arm
O: two because it’s a biceps —> anterior
1) LH: superior margin of glenoid fossa of scapula
2) coracoid process of scapula
I: radial tuberosity of radius
Brachialis
A: flexion of arm
O: anterior surface of humerus
I: coronoid process of ulna
what muscles at the forearm perform flexion of the arm?
biceps brachii and brachialis
What muscles move the wrist, hand, and fingers?
extensor carpi radialis, extensor carpi ulnaris, extensor digitorum, flexor carpi radialis, flexor carpii ulnaris, and the flexor digitorum
Extensor carpi radialis brevis
A: extends/ABDucts hand
O: lateral epicondyle of humerus
I: third metacarpal
Extensor carpi ulnaris
A: extends/ABDucts hand
O: lateral epicondyle of humerus
I: metacarpal of 5th digit
Extensor digitorum
A: extends fingers and hand
O: lateral epicondyle of humerus
I: medial 4 digits
what is the origin of all the extensors?
lateral epicondyle of humerus
what is the one action the extensors all perform?
extension of hand + ABDuction
Flexor carpi radilias
A: flexes wrist/elbow and ABDucts wrist
O: medial epicondyle of humerus
I: base of second metacarpal
Flexor carpi ulnaris
A: flexes and ADDucts wrist
O: medial epicondyle of humerus + olecranon process of ulna
I: metacarpal bone of 5th digit
Flexor digitorum superficialis
A: flexes fingers and wrist
O: medial epicondyle of humerus
I: middle phalanges of medial 4 digits
what is the origin of all the flexors?
medial epicondyle of humerus
what is the one action all the flexors perform?
flexion
What are the muscles that move the abdominal wall and control breathing?
rectus abdominus, external oblique, internal oblique, and transversus abdominus
Rectus abdominus
A: tenses abdominal wall and flexes vetebral column
O:pubic crest; pubic symphysis
I: xiphoid process, costal cartilages of ribs 5-7
External oblique
A: compresses abdomen, contralaterally rotates, and flexes vetebral column
O: external surfaces of inferior 8 ribs
I: linea alba, pubic crest, pubic tubercle, and illiac crest
Internal oblique
A: compresses abdomen, ipsilaterally rotates + flexes vetebral column
O: thoracic columbar fascia, illiac crest, and inguinal ligament
I: linea alba, pubic crest, and inferior 3 or 4 ribs
Transversus Abdominis
A: compresses abdomen
O: thoraculmbar fascia, inguinal ligament, costal cartilages of inferior six ribs, iliac crest
I:linea alba, and pubic crest
