Brainscape's Knowledge GenomeTM

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


See full index

Anatomy 337 > Muscles of the arm, forearm and hand > Flashcards

Muscles of the arm, forearm and hand Flashcards

1
Q

coracobrachialis

A
  • is normally pierced by the musculocutaneous nerve in the middle portion of the muscle belly

Action: Adducts and flexes GH joint

Origin: Coracoid process

insertion: Middle medial shaft of humerus

Innervation: Musculocutaneous nerve

blood supply: brachial artery

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

brachialis

A

Action: Elbow flexion

origin: distal humerus
insertion: proximal ulna

Innervation: Musculocutaneous nerve

blood Supply: radial artery

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

brachioradialis

A

lateral to the flexor carpi radialis
superficial to pronator teres
looks like the muscles of the forearm, but it doesn’t actually cross the wrist

Action:Flexes elbow

Origin:Lateral distal humerus

Insertion:Styloid process of radius

innervation:Radial nerve

Blood Supply: radial artery

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

biceps Brachii

A

This muscle has two heads.
- this is just medial to the Brachialis

Action: Flexes GH joint, elbow flexion, supination of forearm

Origin:
long head: Supraglenoid tubercle
short head: coracoid process of the scapula

insertion: Radial tuberosity and bicipital aponeurosis

Innervation: Musculocutaneous nerve

Blood Supply: brachial artery

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

extensor carpi radialis longus

A
  • On the radial side of the forearm
  • deep to the brachioradialis
  • has a longer tendon and is just superficial and lateral to the extensor carpi radialis brevis

Action:Extends wrist, abducts hand

origin: Lateral distal humerus
insertion: Base of 2nd metacarpal
innervation: Radial nerve

blood supply: radial artery

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

extensor carpi radialis brevis

A
  • On the radial side of the forearm
  • deep to the brachioradialis
  • has a shorter tendon and is just deep to the extensor carpi radialis longus

action: Extends wrist, abducts hand
origin: Lateral epicondyle of humerus
insertion: Base of metacarpal III

Innervation: Radial nerve

blood supply: radial artery

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

extensor carpi ulnaris

A

most medial muscle of the posterior superficial forearm muslces

action: Extends wrist, adducts hand
origin: Lateral epicondyle of humerus
insertion: Base of 5th metacarpal

Innervation: Radial nerve

blood supply: ulnar artery

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

extensor digitorum

A

Note that there is only one extensor digitorum muscle, so there is no other descriptor in the name

action: Extends wrist, 2nd–5th MP joints, PIP joints, & DIP joints
origin: Lateral epicondyle of humerus
insertion: Distal & middle phalanges of digits 2–5

Innervation: Radial nerve

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

extensor digiti minimi

A

just medial to the extensor digitorum and is lateral to the extensor carpi ulnaris
allows you to you can extend your 5th digit much farther while the others are flexed
action: Extends wrist, MP, and PIP joints of finger 5

origin: Lateral epicondyle of humerus
insertion: Proximal phalanx of finger 5

Innervation: Radial nerve

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

extensor indicis

A
  • deep to the extensor digitorum
  • medial to the extensor pollicis longus

action: Extends MP, PIP, and DIP joints of finger 2
insertion: second digit
innervation: radial nerve

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

supinator

A
  • this is a deep muscle in the posterior arm
  • is deep and more difficult to find, but it can be observed running from the lateral epicondyle to the shaft of the radius.
  • this is just distal to the elbow

action: Supinates forearm
origin: Lateral epicondyle of humerus & proximal ulna
insertion: Anterolateral radius

Innervation: Radial nerve

blood supply: radial artery

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

abductor pollicis longus

A
  • a deep muscle in the forearm
  • this is on the lateral side and wraps around the tendons of the extensor carpi radialis longus and brevis
  • this is lateral to the extensor pollicis brevis

action: Abducts thumb
origin: Proximal radius and ulna
insertion: Lateral 1st metacarpal

Innervation:Radial nerve

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

extensor pollicis brevis

A
  • a deep muscle of the forearm
  • it’s tendon sits between the abductor pollicis longus and extensor pollicis longus tendons
  • this is on the lateral side and wraps around the tendons of the extensor carpi radialis longus and brevis
  • this is just medial to the abductor pollicis longus

action: Extends MP joints of thumb
origin: Posterior radius
insertion: thumb

Innervation:Radial nerve

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

extensor pollicis longus

A
  • a deep muscle of the forearm
  • just lateral to the extensor indicis muscle

action: Extends MP and IP joints of thumb
origin: Posterior ulna
insertion: thumb

Innervation:Radial nerve

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

superficial layer of the anterior forearm

A

pronator teres
Flexor carpi radialis
flexor carpi ulnaris
palmaris longus

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

pronator teres

A

deep to brachioradialis and flexor carpi radialis
this is more superior in the forearm
the shortest muscle originating from the medial epicondyle

Action:Pronates forearm

Origin:Medial epicondyle of humerus

Insertion:Lateral radius

innervation:Median nerve

blood supply: ulnar and radial arteries

17
Q

Flexor carpi radialis

A
  • this muscle is going to be medial to the brachioradialis
  • this is lateral to the palmaris longus
  • cross only the wrist joints
  • inserts on the ulnar side of the wrist and assists with radial deviation (wrist abduction)

Action:Flexes wrist and abducts hand

Origin:Medial epicondyle of humerus

Insertion:Base of 2nd & 3rd metacarpals

innervation:Median nerve

blood supply: ulnar artery

18
Q

palmaris longus

A
  • this is going to be medial to the flexor carpi radialis
  • this is lateral to the flexor carpi ulnaris
  • a very small muscle
  • not present in 10-20% of the population.

Action:Weak wrist flexor

Origin:Medial epicondyle of humerus

Insertion:Palmar aponeurosis

innervation:Median nerve

blood supply: ulnar artery

19
Q

flexor carpi ulnaris

A
  • cross only the wrist joints
  • inserts on the radial side of the wrist and also assists with radial deviation (wrist abduction)

Action: Flexes wrist and adducts hand

Origin:Medial epicondyle of humerus

Insertion:Medial carpal and metacarpal bones

innervation:Ulnar nerve

Blood supply: ulnar artery

20
Q

flexor digitorum superficialis (FDS)

A
  • this is the only muscle in the intermediate layer of the anterior arm
  • crosses the wrist, MCP, and PIP joints of digits 2-5 in the hand.
  • Notice how this muscle splits and inserts on the middle phalanx of these digits.
  • the tendons of this muscle are pierced by the tendons of flexor digitorum profundus

Action:Flexes wrist, 2nd–5th MP joints, and PIP joints

Origin:Medial epicondyle of humerus

Insertion:Middle phalanges of fingers 2–5

innervation:Median nerve

blood supply: ulnar artery

21
Q

deep layer of the anterior forearm

A

flexor digitorum profundus (FDP)
flexor pollicis longus
pronator quadratus

22
Q

flexor digitorum profundus (FDP)

A
  • is deep to the flexor digitorum superficialis
  • runs deep to the tendon of FDS through its split at the middle phalanx and continues distally

Action:Flexes wrist, 2nd–5th MP joints, PIP joints, & DIP joints

Origin:Anteromedial ulna

Insertion:Distal phalanges of fingers 2–5

innervation:
- Lateral 1⁄2 = median nerve - Medial 1⁄2 = ulnar nerve

23
Q

flexor pollicis longus

A
  • lateral to the flexor digitorum profundus
  • sends its tendon across the IP joint of the first digit to insert on the distal phalanx of digit 1, the thumb

Action:Flexes MP joint of thumb, IP joint of thumb

Origin: Anterior shaft of radius

Insertion:Distal phalanx of thumb

innervation:Median nerve

24
Q

pronator quadratus

A
  • very deep on the anterior aspect of the distal forearm
  • sits just anterior to the interosseous membrane

Action:Pronates forearm

Origin:Distal ulna

Insertion:Distal radius

innervation:Median Nerve

25
Q

opponens pollicis muscle

A
  • deep to flexor pollicis brevis and abductor pollicis brevis
  • within the thenar eminence

action: opposition of thumb
innervation: median nerve

Blood supply: superficial palmar arch

26
Q

flexor pollicis brevis

A
  • within the thenar eminence
  • medial to the abductor pollicis brevis

Action:Flexes thumb

innervation:Median nerve

blood supply: superficial palmar arch

27
Q

abductor pollicis brevis

A
  • within the thenar eminence
  • lateral to the flexor pollicis brevis

Action: Abducts thumb

innervation: Median nerve

blood supply: superficial palmar arch

28
Q

1/2 LOAF

A

this stands for what the median nerve is innervating in the hand

  • the lateral 2 lumbricals
  • opponens pollicis abductor pollicis brevis
  • flexor pollicis brevis
29
Q

Opponens digiti minimi

A
  • this is in the hypothenar eminence
  • is deep to the flexor digiti minimi and abductor digiti minimi.

Action: Opposition of finger 5

innervation: ulnar nerve

blood supply: ulnar artery

30
Q

flexor digiti minimi

A
  • this is in the hypothenar eminence
  • this is medial and deep to the abductor digiti minimi

Action:Flexes finger 5

innervation: Ulnar nerve

blood supply: ulnar artery

31
Q

abductor digiti minimi

A
  • this is in the hypothenar eminence
  • this is lateral and superficial to the flexor digiti minimi brevis

Action: Abducts finger 5

innervation: Ulnar nerve

blood supply: ulnar artery

32
Q

adductor pollicis

A
  • is part of the deep muscles of the hand.
  • It has two heads: one runs from the thumb horizontally across the hand, while the other runs from the same origin obliquely across the palm.
  • These two heads create a “7” shape. This muscle acts to adduct the thumb.

Action: adduct the thumb

innervation: ulnar nerve

blood supply: deep palmar arch

33
Q

lumbricals

A
  • attach to the flexor tendons within the hand.
  • These thin muscles help you form an “L” with your 2nd-4th digits

Action: Flexes 2nd–5th MP joints and extends 2nd–5th PIP and DIP joints

innervation:

  • Lateral 2 lumbricals: median nerve
  • Medial 2 lumbricals: ulnar nerve

blood supply: superficial palmar arch

34
Q

dorsal interossei

A
  • can see from the dorsal aspect of the hand
  • Dorsal interossei ABduct the digits DAB
  • The interosseous muscle on the lateral aspect of the digit with its fibers running distally towards the midline are dorsal interossei
  • middle (3rd) digit can only abduct, so it has only dorsal interossei on either side of it

Action: Abducts fingers 2–5; flexes MP joints 2–5, and extends PIP and DIP joints

innervation: Ulnar nerve

blood supply: superficial palmar arch

35
Q

palmar interossei

A
  • can see from the dorsal aspect of the hand
  • Palmer interossei ADduct the digits PAD
  • the interosseus muscle on the medial aspect of the digit with its fibers running proximally towards the midline are palmar interossei

Action: Adducts fingers 2–5; flexes MP joints 2–5, and extends PIP and DIP joints

innervation: Ulnar nerve

blood supply: superficial palmar arch

Anatomy 337 (39 decks)

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