Brainscape's Knowledge GenomeTM

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


See full index

Functional Anatomy > Lecture 9 - Muscles Acting on the Hand > Flashcards

Lecture 9 - Muscles Acting on the Hand Flashcards

1
Q

functions of the hand

A
  • > grasp power
  • > pinch precision
  • > feel
  • > comunicate
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

the hand must have…

A
  • > strong mobile framework
  • > non slip, pliable gripping surface
  • > strong muscles without bulk
  • > sensitivity to internal and external environments
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

characteristics of the skin

A
  • > ridges
  • > sweatglands in the ridges
  • > fibrous septa (connects dermis to underlying fascia)
  • > fat between septa (no room for expansion if infected)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

bones and joints of the hands

A

thumb only has two phalanx but digets 2-5 have 3

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

finger movements

A

Add/Abduction

Flex/Extend

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

intrinsic vs extrinsic muscles of the hand

A

Extrinsic muscles have their origin on the forearm and have long tendons than insert into the hand

Intrinsic muscles originate inside the hand and insert on the hand

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

main groups of intrinsic muscles

A
  • > interossei
  • > lumbricals
  • > thenar muscles
  • > hypothenar muscles
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

muscles that flex the fingers from the forearm

A

AKA extrinsic finger flexors

  • > flexor digitorum superficialis
  • > flexor digitorum profundus
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

OIIA of flexor digitorum superficialis

A

Origin

Humeroulnar head: med epicondyle of humerus, ulnar collateral ligament, coronoid process of the ulna

Radial head: superior half of the ant border of the radius

Insertion

  • > shafts of the middle phalanges of digits 2-5

Innervation

  • > median nerve

Action

  • > flexes the middle phalanges at the proximal IP joints, can also flex MCP joints and wrist with stronger contractions
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

OIIA of flexor digitorum profundus

A

Origin

  • > prox ¾ of medial and ant surface of ulna and interosseous membrane

Insertion

  • > base of distal phalanx of digits 2-5

Insertion

  • > Medial part: ulnar nerve Lateral part: interosseus branch of median nerve

Action

  • > flexes distal phalanges at distal IP joints of medial 4 digits, assists with wrist flexion
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

muscles that extend the fingers from the forearm

A

AKA extrinsic finger extensors

  • > extensor digitorum
  • > extensor indicis
  • > extensor digiti minimi
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

OIIA of extensor digitorum

A

Origin

  • > lateral epicondyle of humerus

Insertion

  • > extensor expansions of medial four digits

Innervation

  • > deep branch of the radial nerve

Action

  • > extends d2-5 at metacarpophalangeal joints, extends hand at wrist joint
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

OIIA of extensor digiti minimi

A

Origin

  • > lateral epicondyle of humerus

Insertion

  • > extensor expansion of the 5th digit

Innervation

  • > deep branch of radial nerve

Action

  • > extends D5 at the metacarpophalangeal joints
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

OIIA of extensor indicis

A

Origin

  • > posterior surface of ulna and interosseous membrane

Insertion

  • > extensor expansion of 2nd digit

Innervation

  • > post interosseous nerve and the continuation of the deep branch of the radial nerve

Action

  • > extends 2nd digit and helps extend hand at the wrist joint
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

thumb movements

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

muscles that act on the thumb from the forearm

A

AKA extrinsic thumb muscles

  • > flexor pollicis longus
  • > abductor pollicis longus
  • > extensor pollicis longus
  • > extensor pollicis brevis
17
Q

OIIA of flexor pollicis longus

A

Origin

  • > ant surface of radius and adjacent interosseous membrane

Insertion

  • > base of distal phalanx of thumb

Innervation

  • > anterior interosseous nerve from median nerve

Action

  • > flexes thumb phalanges
18
Q

OIIA of abductor pollicis longus

A

Origin

  • > post surface of ulna, radius and interosseous membrane

Insertion

  • > base of 1st metacarpal

Innervation

  • > posterior interosseous nerve, the continuation of the deep branch of the radial nerve

Action

  • > abducts thumb and extends it at the carpometacarpal joint
19
Q

OIIA of extensor pollicis longus

A

Origin

  • > post surface of middle ⅓ of ulna and interosseous membrane

Insertion

  • > base of distal phalanx of thumb

Innervation

  • > post interosseous nerve, the cont of the deep branch of the radial nerve

Action

  • > extends distal phalanx of thumb at CM and IP joints
20
Q

OIIA of extensor pollicis brevis

A

Origin

  • > post surface of radius and interosseous membrane

Insertion

  • > base of proximal phalanx of thumb

Innervation

  • > post. interosseous nerve, the continuation of the deep branch of the radial nerve

Action

  • > extends proximal phalanx of thumb at CM joint
21
Q

anatomical snuff box

A
  • > radial artery passes through it
22
Q

OIIA of interossei

A

7 muscles

  • > 3 Palmar
  • > 4 dorsal

Origin

  • > shafts of metacarpals

Insertion

  • > bone and extensor expansion of the proximal phalanges 2-5

Innervation

  • > deep branch of the ulnar nerve

Action

the abduct and adduct the fingers

23
Q

OIA of lumbricals

A

4 lumbricals

Origins

  • > 1 and 2: lat tendons of Flexor Digitum Profundus; unipennate
  • > 3 and 4: medial three tendon of FDP; bipennate

Insertion

  • > lat sides of the extensor expansion of D2-5

Innervation

  • > median nerve and deep branch of ulnar nerve

Action

  • > flexes MCP and extend IP joints of D2-5
24
Q

Hypothenars

A
  • > Abductor digiti minimi
  • > flexor digiti minimi
  • > opponens digiti minimi

~ palmaris brevis

25
Q

what is the palmaris brevis and what does it do?

A
  • > muscle located in the subcutaneous tissue of the hypothenar eminence
  • > deppens the hallow of the palm to aid in a palmar grip
  • > protects ulnar artery
26
Q

thenar muscles

A
  • > abductor pollicis
  • > flexor pollicis brevis
  • > opponens pollicis

~ adductor pollicis

27
Q

adductor pollicis

A

adducts and flexes thumb MP joint

  • > 2 heads; transverse and oblique
28
Q

MCP joints have what kind of ligaments

A

collateral

29
Q

stability/mobility of CMC joints

A

D1 - Mobile

D2 - Stable

D3 - Stable

D4 - Mobile (15-30 degs of flexion)

D5 - Mobile

30
Q

palmar aponeurosis

A

thick triangle of long flattened tendon

  • > thenar, hypothenar, and adductor compartment
31
Q

mallet injury

A

caused by direct force to the tip of the finger

  • > results in damage/injury to the extensor digitorum tendon
32
Q

nerves of the hand

A

Median

Ulnar

Radial

Functional Anatomy (14 decks)

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