Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Biomedical Human Anatomy > Muscles of the Arm > Flashcards

Muscles of the Arm Flashcards

1
Q

Pectoralis major

A
  • Origin: clavicular head (sternal end of clavicle), sternocostal head (sternum, costal cartilage ribs 1-6, aponeurosis of external oblique muscle)
  • Insertion: intertubercular sulcus and greater tubercle of humerus
  • Innervation: lateral and medial pectoral nerves
  • Action: arm flexion (clavicular head), extend arm from flexed position (sternocostal head), rotates arm medially, adducts arm
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Latissimus dorsi

A
  • Origin: spinous processes of T6-T12, thoracolumbar fascia, iliac crest, ribs 8(9)-12
  • Insertion: intertubercular sulcus of humerus
  • Innervation: thoracodorsal nerve
  • Action: extends, adducts, medially rotates humerus
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Deltoid muscle

A
  • Origin: lateral third of clavicle, acromion and spine of scapula
  • Insertion: deltoid tuberosity of humerus
  • Innervation: axillary n.
  • Action: clavicular part (flex and medially rotate arm), acromial (abduct arm), spinal (extend and laterally rotate arm)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Supraspinatus muscle

A
  • Origin: supraspinous fossa of scapula
  • Insertion: (superior facet of) greater tubercle of humerus
  • Innervation: suprascapular nerve
  • Action: initiates arm abduction- assisting deltoid, holds humerus in glenoid cavity
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Infraspinatus muscle

A
  • Origin: infraspinous fossa of scapula
  • Insertion: (middle facet of the) greater tubercle of humerus
  • Innervation: suprascapular nerve
  • Action: laterally rotate arm, holds humerus in glenoid cavity
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Teres minor muscle

A
  • Origin: middle part of the lateral border of the scapula
  • Insertion: (inferior facet of the) greater tubercle of humerus
  • Innervation: axillary n.
  • Action: laterally rotate arm, holds humerus in glenoid cavity
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Subscapularis muscle

A
  • Origin: subscapular fossa of scapula
  • Insertion: lesser tubercle of humerus
  • Innervation: upper and low subscapular nerve
  • Action: medially rotate arm, holds humerus in glenoid cavity
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Teres major muscle

A
  • Origin: posterior surface of the inferior angle of the scapula
  • Insertion: intertubercular sulcus of humerus
  • Innervation: lower subscapular n.
  • Action: adduct and medially rotate arm
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Biceps brachii muscle

A
  • Origin: short head (tip of coracoid process of scapula), long head (supraglenoid tubercle of scpaula)
  • Insertion: radial tuberosity
  • Innervation: musculocutaneous nerve
  • Action: flex forearm, supinate forearm, weak glenohumoral flexion
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Corocobrachialis muscle

A
  • Innervation: musculocutaneous n.

- Action: help flex and adduct arm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Brachialis muscle

A
  • Innervation: musculocutaneous n. and radial n.

- Action: flex forearm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Triceps brachii m.

A
  • Origin: long head (infraglenoid tubercle), lateral head (posterior surface of humerus superior to radial groove), medial head (posterior surface of humerus inferior to radial groove)
  • Insertion: olecranon process
  • Innervation: radial n.
  • Action: extend forearm
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Anconeus muscle

A
  • Innervation: radial n.

- Action: extend forearm, assisting triceps brachii, stabilize elbow joint, ulna abduction in pronation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Pronator teres muscle

A
  • Innervation: median nerve

- Action: pronate and flex forearm at elbow

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Flexor carpi radialis muscle

A
  • Innervation: median n.

- Action: flexes and abducts hand at wrist

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Palmaris longus muscle

A
  • Innervation: median n.

- Action: flex hand and tense palmar aponeurosis

17
Q

Flexor carpi ulnaris muscle

A
  • Innervation: ulnar n.

- Action: flexes and adducts hand at wrist

18
Q

Flexor digitorum superficialis muscle

A
  • Innervation: median n.

- Action: flex proximal interphalangeal joint and metacarpophalangeal joints on digits 2-5

19
Q

Flexor digitorum profundus muscle

A
  • Innervation: ulnar and median n.

- Action: flex distal interphalangeal joint on digits 2-5

20
Q

Flexor pollicis longus muscle

A

-Innervation: median n.

Action: flex interphalangeal joint on digit 1

21
Q

Pronator quadratus muscle

A
  • Innervation: median n.

- Action: pronates forearm, bind radius and ulna together

22
Q

Brachioradialis muscle

A
  • Innervation: radial n.

- Action: flex forearm

23
Q

Extensor carpi radialis longus muscle

A
  • Innervation: radial n.

- Action: extend and abduct the hand at wrist

24
Q

Extensor carpi radialis brevis muscle

A
  • Innervation: radial n.

- Action: extend and abduct the hand at wrist

25
Q

Extensor digitorum muscle

A
  • Innervation: radial n.

- Action: extend medial four digits at the metacarpophalangeal joint

26
Q

Extensor digiti minimi muscle

A
  • Innervation: radial n.

- Action: extend fifth digit at the metacarpophalangeal joint

27
Q

Extensor carpi ulnaris muscle

A
  • Innervation: radial n.

- Action: extend and adduct the hand at the wrist

28
Q

Extensor pollicis brevis muscle

A
  • Innervation: posterior interosseous n.

- Action: extend proximal phalanx at metacarpophalangeal joint; extend carpometacarpal joint

29
Q

Abductor pollicis longus muscle

A
  • Innervation: posterior interosseous n.

- Action: abduct and extend at carpometacarpal joint

30
Q

Extensor indicis muscle

A
  • Innervation: posterior interosseous n.

- Action: extend 2nd digit and some wrist extension

31
Q

Supinator muscle

A
  • Innervation: deep radial n.

- Action: supinate forearm

Biomedical Human Anatomy (28 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions