Lab 4: upper limb

Question 1

What muscles insert at the greater tubercle? (3)

Answer 1

Rotator cuff muscles:

Supraspinatus, infraspinatus, teres minor

Question 2

What muscle inserts at the lesser tubercle?

Answer 2

Subscapularis

Question 3

What inserts at the intertubercular groove?

Answer 3

Tendon of the long head of the biceps brachii

Question 4

What inserts at the deltoid tuberosity?

Answer 4

Deltoid muscles

Question 5

What muscles originate at the medial epicondyle?

Answer 5

Hand flexor muscles of the forearm

Question 6

What originates at the lateral epicondyle?

Answer 6

Hand extensor muscle group in forearm

Question 7

What muscle inserts at the olecranon process?

Answer 7

Triceps brachii

Question 8

What muscle inserts at the radial tuberosity?

Answer 8

Biceps brachii

Question 9

How is the neck of the radius held to the ulna?

Answer 9

By the annular ligament, allowing probation and supination

Question 10

1st carpometacarpal joint: classification and movement

Answer 10

Saddle joint

Adduction/abduction, flexion/extension, opposition

Question 11

2-5 carpometacarpal joints: classification and movements

Answer 11

Planar joint

Sliding- slight adduction/abduction, slight flexion/extension

Question 12

1st metacarpophalangeal joint: classification and movements

Answer 12

Hinge or condylar

Flexion/extension, adduction/abduction

Question 13

2-5 metacarpophalangeal joint: classification and movements

Answer 13

Condylar

Adduction/abduction, flexion/extension, circumduction

Question 14

Interphalangeal joint:classification and movements

Answer 14

Hinge

Flexion/extension

Question 15

subscapularis m action

Answer 15

medially rotates arm at shoulder

Question 16

supraspinatus m action

Answer 16

initiates and assists in abduction of arm at shoulder

Question 17

infraspinatus m action

Answer 17

laterally rotates arm at shoulder

Question 18

teres minor m action

Answer 18

laterally rotates arm at shoulder

Question 19

teres major m: origin, insertion, action

Answer 19

origin: inferior angle of scapula
insertion: medial lip of intertubercular groove of humerus
action: extension, medial rotation, and adduction at the shoulder

Question 20

coracobrachialis m: origin, insertion, action

Answer 20

origin: coracoid process of scapula
insertion: medial margin of shaft of humerus
action: flexion, adduction of arm at shoulder

Question 21

pectoralis major m: origin, insertion, action

Answer 21

origin: cartilage of ribs 2-6, body of sternum, inferior medial clavicle
insertion: greater tubercle and intertubercular groove of humerus
action: medial rotation, flexion, adduction of arm at shoulder

Question 22

latissimus dorsi m: origin, insertion, action

Answer 22

origin: spinous process of inferior thoracic, all lumbar, and sacral vertebrae, ribs 8-12, thoracolumbar fascia
insertion: floor of intertuberculer sulcus of humerus
action: medial rotation, adduction, extension of arm at shoulder

Question 23

Deltoid: origin, insertion, action

Answer 23

origin: clavicle, acromion, spine of scapula
insertion: deltoid tuberosity (lateral) of humerus
action:
anterior fibers - flexion, medial rotation
posterior fibers - extension, lateral rotation
all - adduction

Question 24

movements occurring at humeroulnar joint

Answer 24

flexion, extension

Question 25

biceps brachii m. action

Answer 25

flexion of arm at shoulder, flexion of forearm at elbow, supination

Question 26

brachialis m. action

Answer 26

flexion of forearm at elbow

Question 27

brachioradialis m. action

Answer 27

flexion of forearm at elbow

Question 28

triceps brachii m. action

Answer 28

extension of forearm at elbow | long head involved with extension and adduction of arm at shoulder

Question 29

anconeus m. action

Answer 29

extension of forearm at elbow

Question 30

supinator m. action

Answer 30

supinates

Question 31

pronator teres m. action

Answer 31

rotates radius against ulna at proximal radioulnar joint, pronator of hand

Question 32

pronator quadratus m. action

Answer 32

rotates radius against ulna at distal radioulnar joint, pronator of hand

Question 33

what 3 muscles originate at the medial epicondyle?

Answer 33

(wrist flexors) flexor carpi radialis, flexor carpi ulnaris, palmaris longus

Question 34

what 3 muscles originate at the lateral epicondyle?

Answer 34

(wrist extensors) extensor carpi radialis longus, extensor carpi radialis brevis, extensor carpi ulnaris

Question 35

what 2 muscles contract to produce adduction of the hand at the wrist? (ulnar deviation)

Answer 35

flexor carpi ulnaris, extensor carpi ulnaris

Question 36

what 3 muscles would contract to produce abduction of the hand at the wrist? (radial deviation)

Answer 36

flexor carpi radialis, extensor carpi radialis longus and brevis

Question 37

extensor digitorum m action

Answer 37

extension of the fingers at the metacarpophalangeal joint, extension of the hand at the wrist

Question 38

flexor digitorum superficialis m. action

Answer 38

flexion of the fingers at the proximal interphalangeal joint, flexion of the fingers at the metacarpophalangeal joint, flexion of the hand at the wrist

Question 39

flexor digitorum profundus m. action

Answer 39

flexion of the fingertips at the distal interphalangeal joins (main action), flexion of the fingers at the proximal interphalangeal joints, flexion of the hand at the wrist

Question 40

dorsal interossei muscle action

Answer 40

abduct and flex digits at metacarpophalangeal joints, extend distal phalanges at interphalangeal joints

Question 41

palmar interossei muscle action

Answer 41

adduct and flex digits at metacarpophalangeal joints, extend distal phalanges at interphalangeal joint