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Anatomy > Upper Limb Muscles > Flashcards

Upper Limb Muscles Flashcards

1
Q

muscles of the pectoral

region?

A

 Pectoralis major.  Pectoralis minor.  Subclavius.  Serratus anterior.

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2
Q

Pectoralis Major

Origin ? Insertion? Nerve supply? Action?

A 
• Nerve supply :
•  Medial & lateral pectoral
nerves.
• Action :
• Adduction and medial rotation
of the arm.
• Clavicular head helps in flexion
of arm (shoulder).
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3
Q

Pectoralis minor

Origin ? Insertion? Nerve supply? Action?

A

• Origin:
• from 3rd , 4th , and 5th ribs
close to their costal
cartilages. • Insertion: • coracoid process. • Nerve supply: • medial pectoral nerve. • Action:
• Depression of shoulder. • Draw the ribs upward and
outwards during deep
inspiration

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4
Q

Subclavius

Origin ? Insertion? Nerve supply? Action?

A

Origin: • From 1st rib at the junction
with its costal cartilage. • Insertion: • Subclavian groove at the
inferior surface of middle 1/3
of clavicle. • Nerve supply: • Nerve to subclavius from
upper trunk of brachial plexus. • Action: • Steadies the clavicle during
movement of the shoulder
joint.

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5
Q

Serratus anterior

Origin ? Insertion? Nerve supply? Action?

A

Origin: Upper eight ribs. Insertion: Ventral aspect of medial border and inferior angle of scapula. Nerve supply: Long thoracic nerve. Action: Draws the scapula forward (protraction, in boxing). Rotates scapula outwards in raising the arm above 90 degree.

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6
Q

It is a thickened
membrane of deep fascia between the subclavius and pectoralis minor.
?

A

Clavipectoral Fascia

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7
Q

Clavipectoral Fascia is It is pierced by ?

A

 Lateral pectoral nerve.
 Thoraco-acromial artery
 Cephalic vein.
 Few lymph vessels.

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8
Q 
A pyramid-shaped
space between the
upper part of the arm
and the side of the
chest
?
A

Axilla

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9
Q

Axilla what passes?

A 
• Through this major
neurovascular
structures(Axillary
vessels & nerves)
pass between neck
&  thorax and upper
extremity.
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10
Q

apex of axilla is the? Bounded by?

A

cervicoaxillary canal: The passageway between
theneck and the axilla

It is bounded by the 1st rib,
clavicle, and superior edge
of the scapula.

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11
Q

APEX’s Base formed by? Bounded by? In front? Behind? Medially?

A

Formed by skin stretching between the anterior and
posterior walls.

bounded:

-In front: the anterior
axillary fold (formed by
the lower border of the
Pectoralis major muscle).

-behind by the posterior
axillary fold (formed by
the tendon of latissimus
dorsi and the teres major
muscle).

-medially by the ribs and
the chest wall.

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12
Q

Apex
Anterior wall? Posterior wall ?
Medial wall? Lateral wall?

A
  • Anterior wall formed by the
    • pectoralis major • pectoralis minor • clavicopectoral fascia
    -Posterior wall:
    • Subscapularis • Latissimus dorsi • Teres major muscles
    -medial wall:
    Serratus anterior Upper 4-5 ribs & Intercostal muscles
    -lateral wall:
    Coracobrachialis Intertubercular groove of humerus Biceps brachii
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13
Q

Contents of The Axilla

A 
1. Cords and
braches of
brachial plexus. 
2. Axillary artery and
its branches. 
3.Axillary vein and its
tributaries.
4. Axillary lymph
nodes.
5. Axillary fat. 
6.Loose connective
tissue.
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14
Q

The brachial
plexus is formed
by the ?

A

anterior
rami of C5
C6,C7,C8, and T1

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15
Q

The apex of the axilla region is an opening
between the clavicle, first rib and the scapula. • In this apex, the vessels and nerves may
become compressed between the bones – this
is called?

A

thoracic outlet syndrome.

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16
Q

The serratus anterior is
paralyzed owing to injury to
? What happens?

A 
long thoracic nerve .
When the arm is raised, the
medial border and inferior
angle of the scapula pull
markedly away from the
posterior thoracic wall, a
deformation known as a
winged scapula
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17
Q

Shoulder Muscles?

A

Deltoid, • Teres major, • The four rotator cuff muscles (supraspinatus,
infraspinatus, subscapularis and teres minor).

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18
Q

Rotator cuff muscles attachments, innervation, and actions?

A
  1. Supraspinatus:
    Innervation: Suprascapular nerve.
    • Actions: Abducts the arm 0-15o, and
    assists deltoid for 15-90o
  2. Infraspinatus
    • Innervation: Suprascapular nerve. • Actions: Laterally rotates the arm.
  3. Subscapularis:
    Innervation: Upper and lower
    subscapular nerves.
    • Actions: Medially rotates the arm.
  4. Teres Minor
    • Innervation: Axillary nerve.
    • Actions: Laterally rotates the arm.
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19
Q

Teres Major

Origin ? Insertion? Nerve supply? Action?

A 
Originates from the
posterior surface of the
inferior angle of the
scapula. •  It attaches to the
intertubercular groove of
the humerus. • Innervation: Lower
subscapular nerve. • Actions: Adducts at the
shoulder and medially
rotates the arm.
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20
Q

refers to inflammation
of the tendons of the rotator cuff muscles. ? muscle most commonly affected is the
? During which movement?

A

Rotator Cuff Tendonitis

supraspinatus
abduction, causes inflammation and
degenerative changes in the tendon itself.

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21
Q

thickened band of deep fascia in center of palm of the hand. ?

A

Palmar Aponeurosis

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22
Q

Attachment of the Palmar Aponeurosis

?

A

Apex: flexor retinaculum & receives palmaris longus insertion Base: 4 slips

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23
Q

Function of Palmar Aponeurosis

?

A

Function: improve the grip Protect underlying structures

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24
Q

progressive shortening,
thickening, and fibrosis of the
palmar aponeurosis
Is called? What does it do?

A

Dupuytren contracture
pulls the
4th and 5th fingers into partial
flexion.

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25
Q

It is a thickening of deep fascia that lies over the front of the carpal bones
?

A

FLEXOR RETINACULUM

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26
Q

FLEXOR RETINACULUM

RELATIONS Superficial: from lateral to medial:
?

A

Superficial palmar branch of radial artery 2. Palmar cutaneous branch of median
nerve
3. Tendon of palmaris longus
4. Palmar cutaneous branch of ulnar nerve
5. Ulnar vessels
6. Ulnar nerve

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27
Q

FLEXOR RETINACULUM

RELATIONS Deep: Structures passing through carpal
tunnel
?

A

Tendon of FPL & its synovial sheath (radial
bursa)
8. Tendons of FDS & FDP & their common
synovial sheath (Ulnar bursa)
9. Tendon of FCR & its synovial sheath ( in a
special compartment)
10. Median nerve

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28
Q

HAND muscles ?

A
  1. Thenar eminence ( 3 muscles : • Flexor pollicis brevis • Opponens pollicis • abductor pollicis ) ( N supply: median nerve)
  2. Hypothenar eminence ( 3 muscles : • Abductor digiti minimi • Flexor digiti minimi • Opponens digiti minimi )( N.Supply=ulnar)

Superficial :
3. Palmaris brevis

Intermediate group

  1. Lumbricals ( 4 muscles : • lateral 2 by median n • medial 2 by ulnar n )
  2. Interossei ( 8 muscles : Palmar interossei ( 3) Dorsal Interossei (4) ) ( by ulnar N)
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29
Q

Thenar eminence

Muscles and nerve supply?

A 
Flexor pollicis brevis
• Opponens pollicis
• Adductor pollicis
• The median nerve innervates
all the thenar muscles.
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30
Q

Hypothenar Muscles and nerve supply?

A

Hypothenar group: eminence • Abductor digiti minimi • Flexor digiti minimi
• Opponens digiti minimi • The ulnar nerve innervates
the muscles of the
hypothenar eminence.

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31
Q

Lumbrical muscles

Nerve supply and action?

A

Nerve supply . • lateral 2 by median n • medial 2 by ulnar n Action: writing position • Flex metacarpophalangeal
joints • Extend interphalangeal
joints of medial 4 fingers

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32
Q

Palmar interossei

Location? Action? Innervation?

A

(3 )These are located anteriorly on the hand. There are three palmar interossei muscles • Actions: Adducts the fingers at the MCP joint. • Innervation: Ulnar nerve.

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33
Q

Dorsal Interossei

Location ? Action? Nerve supply?

A

These can be palpated
on the dorsum of the
hand. • There are four dorsal
interossei muscles. • Actions: Abduct the
fingers at the MCP joint. • Innervation: Ulnar
nerve

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34
Q

It is a thickening of deep fascia in front of the fingers? Function?

A

Synovial flexor sheath

They enable tendons to slide freely over each other during movements of the fingers

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35
Q

Common synovial sheath surround? Exception? .

A

Common synovial sheath: Surrounds FDS & FDP • 2- synovial sheath for FPL: FPL has its own synovial sheath that continues till its insertion

36
Q

strong ligamentous tunnels containing the flexor tendons and their synovial sheaths.

A

fibrous digital sheaths:

37
Q

Inflammation of the tendon and synovial sheath, the digit swells and movement becomes painful. ?

Explain spread

A

Tenosynovitis/ In 2nd, 3rd, and 4th fingers, the infection is usually confined to the infected finger. Tenosynovitis in (5) little finger may spread to the common sheath and thus through the palm and carpal tunnel to the anterior forearm.

38
Q

Anterior (flexor) Compartment of the arm ?

A

Muscles: Coracobrachialis. Biceps brachii. Brachialis.

39
Q

Anterior (flexor) Compartment
Coracobrachialis. Biceps brachii. Brachialis.
Origin ? Insertion? Nerve supply?

A

Coracobrachialis
Origin: Apex of coracoid process. Insertion: Medial side of the midshaft of the humerus.

Biceps Brachii
Origin: • The short head: coracoid process. • The long head:  Supraglenoid tubercle within the shoulder
joint. Insertion:
• Radial tuberosity.
• As the tendon enters the forearm, a
flat sheet of connective tissue (the
bicipital aponeurosis) fans out from
the medial side of the tendon to blend
with deep fascia covering the anterior
compartment of the forearm.

Brachialis
• Origin:
Lower  half  of  the  ant. aspect of the humerus.
• Insertion:
Tuberosity of the ulna
beneath  the  biceps
brachii muscle

N suppply: Musculocutaneous N., except a small
component of the lateral part of brachilais is innervated by the radial nerve.

40
Q

Musculocutaneous nerve

Route?

A 
Pierces  the  coracobrachialis
muscle.
• Runs  between  the  biceps
and brachialis.
• Reaches  the  lateral  side  of
the biceps tendon.
•  Penetrates the deep fascia,
ends  as  the  lat.  cutaneous
nerve of the forearm.
41
Q 
Musculocutaneous Nerve (nerve of the flexor comp.) 
Motor and sensory?
A

Motor: all three muscle of the ant.

compartment. • Sensory: lateral skin of the forearm.

42
Q

Posterior Compartment of the Arm ?

Origin? Insertion? Nerve supply? Action?

A

Origin: (Triceps)
Long head from infraglenoid tubercle of the scapula (extracapsular). Lateral head from an linear roughening superior to the radial groove of the humerus Medial head from the shaft of the humerus inferior to the radial groove.
• Insertion: Superior surface of the olecranon process.
• Nerve supply: radial nerve
• Action: Extensor of the elbow joint.

43
Q

is an
important area of transition between
the arm and the forearm. It is the
triangular depression in the front of
the elbow.
?

A

Cubital Fossa

44
Q

Cubital Fossa

Boundaries? Lateral? Medial? Base? Roof? Floor?

A

Lateral: brachioradialis
Medial: pronator teres.
Base: a line between the two humeral epicondyles.
Floor: brachialis.
Roof: Roof: Skin, superficial fascia, and deep fascia.

superficial: medial cubital vein/ cephalic vein / basilic vein/ medial and lateral cutaneous nerves of forearm
deep: bicipital aponrosis

45
Q

Cubital Fossa

• Contents from medial to lateral ?

A 
1. Median N.: is the most medial
structure,  leaves  the  fossa  by
passing  between  the  two
heads  of  the  pronator  teres
muscle
2. Brachial  A.:   terminates  at  the
apex by dividing into radial and
ulnar arteries.
3. Tendon of biceps brachii.
46
Q

Deltoid

Origin ? Insertion? Nerve supply? Action?

A 
Origin: 
Ant.  border  of  the  lat.  third  of
the clavicle.
• Lat. border of acromion
• Lower  lip  of  the  crest  of  the
scapular spine.
Insertion:

Deltoid tuberosity of the humerus.
Nerve supply:
Axillary nerve.

Action:
• Ant.  fibres,  flexor  and
medial rotator of the arm .
• Post.  fibres,  extensor  and
lateral rotator of the arm .
• Middle  fibres,  abductor  of
the shoulder from 15°-90°
47
Q

Gateways to the Posterior Scapular Region? Names? Boundaries?

A

The quadrangular space Boundaries • the teres minor, • the surgical neck of the humerus, • the teres major • the long head of the triceps brachii.

The triangular space Boundaries: • the long head of the triceps brachii. • the teres major. • the teres minor.

The triangular interval Boundaries • the long head of the triceps brachii, • the shaft of the humerus • the teres major.

48
Q

Gateways to the Posterior Scapular Region

Structures that pass through them?

A

Qspace

Structures passing through: Axillary nerve Posterior circumflex humeral artery and vein.

Tspace
Structures passing through: The circumflex scapular artery and vein.

Tint
Structures passing through: Radial nerve Profunda brachii artery

49
Q

the anterior compartment muscle of forearms :

A

A. Superficial

  1. Pronator teres ( median nerve lies between the heads )
  2. Flexor carpi radialis
  3. Palmaris longus
  4. Flexor carpi ulnaris ( supply ulnar nerve+ lies overseen the two heads of this muscle )

Nerve supply: median nerve except flexor carpi radialis ulnar nerve.

B. Intermediate
1. Flexor digitorum superficialis

Nerve supply : median nerve

C. Deep

  1. Flexor digitorum profundus ( Its lateral half: from the anterior interosseus nerve (branch of the median nerve) It medial half: from the ulnar nerve.)
  2. Pronator Quadratus ( anterior interoseous nerve of median nerve)
  3. Flexor pollicis longus (anterior interoseous nerve of median nerve)

Nerve supply: anterior interoseous nerve of median nerve except flexor digitorum profundus

50
Q

Pronator Teres

Origin? Insertion? Nerve? Action?

A 
Origin by two heads
Superficial head: Medial
epicondyle. Deep Head : Coronoid
process of  ulna  Insertion: middle of
shaft of radius.  Innervated by median
nerve.  Action:  Pronates  and  flexes  forearm. Note :  Median nerve lies
between its  two heads
51
Q

Flexor Carpi Radialis

Origin? Insertion? Nerve? Action?

A 
Flexor Carpi Radialis
 Origin: medial
epicondyle of humerus.
 Insertion: Base of
second and third
metacarpals.  Innervated by median
nerve.  Action:
-Flexor
-[radial]  abductor of
wrist.
- Flexes the elbow.
52
Q

Palmaris longus

Origin? Insertion? Nerve? Action?

A 
Origin: Medial Epicondyle of
humerus.
 Inserted into the flexor
retinaculum  and the palmar
aponeurosis
 Innervated by median nerve.  Action: Weak flexor of wrist.

Degenerating muscle  absent in 13%   of arms.(cf. the plantaris in leg)
 The palmar aponeurosis
represents  the distal part of the
tendon of  Palmaris longus.
53
Q

Flexor Carpi Ulnaris

Origin? Insertion? Nerve? Action?

A

Origin: Humeral head –(Medial Epicondyle humerus) Ulnar head (shaft ulna)  Inserted into the pisiform and
the base of fifth metacarpal.  Nerve Supply: Ulnar nerve  Action:
Flexor and
adductor(ulnar) of wrist .  Ulnar nerve passes
between two heads of this
muscle.

54
Q

Flexor Digitorum Superficialis

Origin? Insertion? Nerve supply? Action?

A

Origin:
medial epicondyle of humerus,
And upper part of radius and ulna

Inserts into the middle phalanges of medial 4 fingers
Innervated by median nerve
Action: Flexor of proximal interphalangeal joints, metacarpophalangeal and wrist joints.

55
Q

narrow passageway found on the anterior portion of the wrist. It serves as the entrance to the palm for several tendons and the median nerve.
?

A

carpal tunnel

56
Q

Flexor Digitorum Profundus

Origin? Insertion? Nerve supply? Action?

A

Origin:
From shaft of the ulna and interosseus
membrane. Insertion:The muscle divides into 4 tendons
which are inserted into the bases of the distal phalanges of the medial 4 fingers.
Nerve Supply: Its lateral half: from the anterior interosseus nerve (branch of the median nerve)
It medial half: from the ulnar nerve.
Action:
1 Flexion of the distal interphalangeal joints (of the 2.
medial 4 fingers.) Helps in flexion of the proximal interphalangeal joints and 3.
metacarpophalangeal joints (of the medial 4 fingers). Helps of flexion of the wrist joint.

57
Q

Flexor Digitorum Profundus unique features

?

A
  • It has a dual nerve supply so it is a
    composite or hybrid muscle
    -The tendons give origin to the
    lumbricals ms. in the palm.
-The tendons of flexor digitorum
profundus  passes within the
tendons of  flexor digitorum
superficialis before insertion on the
phalanges.
58
Q

Pronator Quadratus

Origin? Insertion? Nerve supply? Action?

A 
Arises from anterior
surface of distal ulna.
Inserted into anterior
surface of distal radius.
Innervated by anterior
interosseous nerve (branch of
the median nerve)
Action: Pronates the forearm and helps to hold lower ends of radius and ulna together, especially when hand is weight bearing.
59
Q

Flexor Pollicis Longus

Origin? Insertion? Nerve supply? Action?

A

Origin From the anterior surface of the
shaft of the radius and
interosseus membrane.  Insertion: Into the base of the distal phalanx
of the thumb.  Nerve Supply: From the anterior interosseus nerve
(branch of the median nerve). 
Action:
Flexion of the thumb

60
Q

Pressure on median nerve because of tightly packed flexor digitorum tendons ?

A

CARPAL TUNNEL SYNDROME

61
Q

is a compression neuropathy of the median nerve at the elbow between the two sections of the pronator teres muscle in the forearm. ? Results in ?

A

PRONATOR TERES SYNDROME

Weak pronation

62
Q

? develops when swelling or bleeding occurs within a compartment. ?

A

COMPARTMENT SYNDROME

63
Q

develops when swelling or bleeding occurs within a compartment. / Blood supply is disrupted and nerve compression can lead to abnormal sensations, muscular weakness and loss.
?

A

COMPARTMENT SYNDROME

64
Q

medial epicondylitis, is tendinosis of the medial epicondyle ? ,most common for?

A

Golfer’s elbow

It is the most common elbow injury for rock climbers, construction and plumbing, golfers etc.

65
Q

Muscles of the Back of Forearm

A

Extensors of the forearm :

Extensor compartment :

A. superficial:

  1. Brachioradialis (radial N)
  2. Extensor carpi radialis longus (radial N)
  3. Extensor carpi radialis brevis
  4. Extensor digitorum
  5. Extensor digiti minimi
  6. Extensor carpi ulnaris
  7. Anconeus ( Radial nerve )

Nerve supply: posterior interosseous nerve
Except ( Brachioradialis 2- ECRL 3- Anconeus= Radial N)

B. Deep:

  1. Supinator ( nerve lies between two heads )
  2. Abductor pollicis longus
  3. Extensor pollicis longus
  4. Extensor pollicis brevis
  5. Extensor indicis

Nerve supply : posterior interosseous nerve

66
Q

Brachioradialis muscle

Origin? Insertion? Nerve supply? Action?

A

Origin: Lateral supracondylar ridge Insertion: Lower end of radius (lateral surface) N.S.: Radial nerve Action: • Flexion of elbow in mid-prone position • Initiation of supination & pronation

67
Q

Extensor carpi radialis longus

Origin? Insertion? Nerve supply? Action?

A 
Origin :
Distal part of lateral supracondylar of humerus 
Insertion : base of 2nd metacarpal 
Nerve supply: 
Radial nerve 
Action: extension and abducts the wrist
68
Q

Extensor carpi radialis brevis

Origin? Insertion? Nerve supply? Action?

A

Origin: later epicondyl of humerus
Insertion: base of 3rd metacarpal
Nerve supply: posterior interosseous
Action: Extends and abducts the wrist

69
Q

Extensor digitorum muscle

Origin? Insertion? Nerve supply? Action?

A
  • Origin: Common extensor origin (Lateral epicondyle of humerus)
  • Insertion: Divides into 4 tendons to medial 4 fingers Which insert via extensor expansion (hood) into Middle & distal phalanges
  • N.S.: Posterior interosseous nerve
  • Action: • Extension of elbow & wrist • Extension of all joints of medial 4 fingers
70
Q 
Is triangular-shaped connective
tissue aponeurosis
• Situated on the dorsum of
Proximal phalanx of the medial 4
fingers (Thumb has no extensor
expansion)
?
A

extensor expansion (hood)

71
Q

Receives tendons of Extensors,

Lumbericals& Interossei of fingers ?

A

The extensor expansion (hood)

72
Q

The extensor expansion (hood)

Splits into three parts?

A 
Splits into three parts:
 A central part, which is inserted
into the base of the  middle
phalanx
 Two lateral parts, which converge to be inserted into the base of the distal phalanx
73
Q

Extensor digiti minimi muscle

Origin? Insertion? Nerve supply? Action?

A

Origin: Common extensor origin (Lateral epicondyle of humerus) Insertion: Extensor expansion of little finger N.S.: Posterior interosseous nerve Ex. Digiti minimi
Action: • Extension of elbow & wrist • Extension of all joints of
little finger

74
Q

Extensor carpi ulnaris muscle

Origin? Insertion? Nerve supply? Action?

A 
Origin:
Common extensor origin  +
Posterior border of ulna Insertion: Base of 5th metacarpal bone N.S.: Posterior interosseous nerve Action: • Extension of elbow &
wrist • Adduction (Ulnar
deviation) of wrist
75
Q

Anconeus muscle

Origin? Insertion? Nerve supply? Action?

A

Origin: Back of lateral epicondyle Insertion: Posterior surface of ulna N.S.: Radial nerve Action: Assist in extension of elbow

76
Q

Supinator muscle

Origin? Insertion? Nerve supply? Action?

A 
-Origin : 
2 heads 
Humeral head and a deep ulnar head 
—Insertion: 
Upper 1/3 of Lateral surface of  Humeralradius 
-N.S.: Posterior interosseous nerve 
-Action: Supination of forearm  Posterior interosseous nerve
lies between its two heads
77
Q

Abductor pollicis longus muscle

Origin? Insertion? Nerve supply? Action?

A
  • Origin: Posterior surface of ulna Posterior surface of radius Interosseus memebrane
  • Insertion: Base of 1st metacarpal bone.
  • N.S.: Posterior interosseous nerve
  • Action: Abduction of thumb
78
Q

Extensor pollicis brevis muscle

Origin? Insertion? Nerve supply? Action?

A
  • Origin: Posterior surface of radius
  • Insertion: Base of proximal phalanx of thumb
  • N.S.: Posterior interosseous nerve
  • Action: Extension of carpometacarpal & metacarpophalangeal joints of thumb
79
Q

Extensor pollicis longus muscle

Origin? Insertion? Nerve supply? Action?

A
  • Origin: Posterior surface of ulna
  • Insertion: Dorsal surface of base of distal phalanx of thumb Its Tendon passes medial to dorsal tubercle of radius
  • N.S.: Posterior interosseous nerve
  • Action: Extension of all joints of thumb
80
Q

Extensor indicis muscle

Origin? Insertion? Nerve supply? Action?

A
  • Origin: Posterior surface of ulna
  • Insertion: Extensor expansion of index finger
  • N.S.: Posterior interosseous nerve
  • Action: Extension of all joints of index finger
81
Q

Triangular depression on lateral Side of wrist joint. ?

A

Anatomical Snuff Box

82
Q

Anatomical Snuff Box

Boundaries? Lateral medial floor and content?

A

Boundaries:

  • Lateral: tendons of Abductor pollicis longus & Extensor pollicis brevis
  • Medial: Tendon of Extensor pollicis longus
  • Floor: Styloid process of radius Scaphoid, Trapezium -Contents: Radial artery
83
Q

Thickening of deep fascia on dorsal surface of wrist ?

A

Extensor retinaculum

84
Q

Extensor retinaculum
Structure superficial to it?
Deep to it?

A
  • Structures superficial to it: Superficial branch of radial n. Cephalic v. Basilic v. Dorsal cut. Branch of ulnar n. •

-Structures deep to it: 6 compartments contain all long extensor tendons except Brachioradialis • It holds the long extensor
tendons in position

85
Q

after fracture of the distal third of the radius. Roughening of the dorsal tubercle of the radius by the fracture line can cause excessive friction on the tendon, which can then rupture .
?

A

Rupture of the Extensor Pollicis Longus

86
Q

caused by a partial tearing or degeneration of the origin of the superficial extensor muscles from the lateral epicondyle of the humerus. It is characterized by pain and tenderness over the lateral epicondyle of the humerus, with pain radiating down the lateral side of the forearm; it is common in?

A

Tennis Elbow

87
Q

Sudden severe tension on a long extensor tendon may avulse
part of its attachment to the phalanx. • This deformity results from the distal interphalangeal joint
suddenly being forced into extreme flexion leading to avulsion
of extensor expansion tendon from base of the distal phalanx.
As a result, the person cannot ?
Condition?

A

Mallet or Baseball Finger
the person cannot extend the distal interphalangeal
joint.

Anatomy (7 decks)

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