Brainscape's Knowledge GenomeTM

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


See full index

Anatomy Muscles > Shoulder Region Intrinsic Muscles > Flashcards

Shoulder Region Intrinsic Muscles Flashcards

1
Q

The intrinsic muscles connect?

A

Scapula to humerus

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

Name the muscles that connect scapula to humerus?

A
  1. Deltoid
  2. Supraspinatus
  3. Infraspinatus
  4. Teres minor
  5. Teres major
  6. Subscapularis
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Name the rotator cuff muscles?

A
  1. Supraspinatus
  2. Ifraspinatus
  3. Teresminor
  4. Subscapularis
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Rotator cuff muscles attach to which part of shoulder joint?

A

Capsule

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

Shape of deltoid?

A

Triangular

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

Parts of deltoid? And origin of deltoid?

A
  1. Clavicular fibres - originates from lateral 3rd of clavicle
  2. Acromial fibres - originate from the acromion of scapula
  3. Spinal fibres - originate from spine of scapula
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Insertion of deltoid?

A

Deltoid Tuberosity on lateral aspect of humerus

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

Nerve supply of deltoid muscle?

A

Axillary nerve

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

Axillary nerve arises from which part of brachial plexus?

A

Posterior cord of brachial plexus

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

Vascular supply of deltoid?

A
  1. Thoracoacromial artery
  2. Anterior and posterior humeral circumflex artery
  3. Subscapular artery
  4. Deltoid branch of profunda brachii artery

All arise from axillary artery except profunda brachii which arises from brachial artery

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

Action of deltoid?

A

Anterior (clavicular) fibres:
Flex and medially rotate the arm

Posterior (spinal) fibres:
Extend and laterally rotate the arm

Acromial (middle) fibres
Abduct the arm (takes over from from supraspinatus which abduct the first 15°)

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

In relation to trapezius, supraspinatous lies?

A

Deep to it

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

Origin of supraspinatus muscle?
Insertion?

A

Originates from Supraspinatus fossa of scapula
Runs under acromion
Inserts on the greater tubercle of humerus

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

How many facets of greater tubercle of humerus ?
And which muscles inserts on them?

A

3 facets:
1. Superior facet - supraspinatus
2. Middle facet - infraspinatus
3. Inferior facet - teres minor

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

Which nerve supplies supraspinatus muscle?

A

Suprascapular nerve

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

Nerve supply for infraspinatus?

A

Suprascapular

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Function of supraspinatus?

A

Abducts the arm
Stability to shoulder joint

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Infraspinatus muscle originates from?

A

Infraspinatus fossa of scapula

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Action of infraspinatus?

A

laterally rotates the humerus at glenohumeral joint

Stabilizes shoulder joint

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Origin of teres minor?

A

Upper two thirds of the lateral border of scapula

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Location of teres minor?

A

Just below infraspinatus
And just above teres major

22
Q

Insertion of teres minor?

A

Inferior facet of greater tubercle of humerus

23
Q

Function of teres minor?

A

Same as infraspinatus:
Laterally rotates the arm
Stabilizes the joint

24
Q

Nerve supply of teres minor?

A

Axillary nerve

25
Q

Axillary nerve supplies which 2 muscles?

A

Deltoid and teres minor

26
Q

Origin of teres major?

A

Lower 3rd of lateral border of scapula

27
Q

Insertion of teres major?

A

medial lip of intertubercular groove of humerus

28
Q

Action of teres major?

A

Adducts the arm
Medially rotates it

29
Q

What function do the lady (latissimus dorsi) and two majors (pectoralis major and teres major) have in common?

A

Adduct the arm
Medially rotate it
Extend it

30
Q

Teres major is supplied by which nerve?

A

Lower subscapular nerve

31
Q

Nerve supply of rotator cuff mucles?

A
  1. Supraspinatus and
  2. Infraspinatus ——— Suprascapular nerve
  3. Teres minor—–axillary nerve
  4. Subscapularis—-upper and lower subscapular nerve
32
Q

The lower subscapular nerve originates from which part of brachial plexus?

A

posterior cord of brachial plexus

33
Q

Origin of subscapularis muscle?

A

Subscapularis fossa of scapula

34
Q

Insertion of subscapularis muscle?

A

On lessor tubercle of humerus

35
Q

Action of subscapularis?

A

Same as teres major (as have same nerve supply from subscapularis nerve)

Medially rotate the arm
Stabilizes shoulder joint

36
Q

Insertion of rotator cuff muscles is on?

A

humerus
3 on greater tuberosity of humerus
1 on lesser

37
Q

The largest and strongest rotator cuff muscle?

A

Subscapularis

38
Q

Rotator cuff syndrome? Rotator cuff tendonitis?

A

Inflammation
Injury
Degeneration of rotator cuff

Muscle tear/tendinitis
Common in young atletes
E.g when bowling in cricket

Main affected muscle is supraspinatus

As it gets pinched underneath acromion

39
Q

What is subacromial impingement syndrome?

A

Associated with rotator cuff injuries

Subacromial impingement syndrome is a condition where the tendons and bursa in the shoulder become compressed and irritated, causing pain, weakness, and limited range of motion in the shoulder.
Supraspinatus Tendonitis
Subacromial Bursitis

40
Q

What is bursa?

A

Fluid filled sac that reduce friction between surfaces

41
Q

Origin of deltoid?

A

Lateral 3rd of clavicle
Acromion
Spine of scapula

42
Q

The initial abduction (first 15°) of arm is done by which muscle?

A

Supraspinatus

43
Q

Which muscle forms the inferior border of quadrangular space?

A

Teres major

44
Q

What muscle forms superior border of quadrangular space?

A

Teres minor

45
Q

What is on the lateral side of quadrangular space?

A

Surgical neck of humeus

46
Q

What is on the medial side of quadrangular space?

A

Long head of triceps

47
Q

What passes through the quadrangular space?

A
  1. Axillary nerve
  2. Posterior humeral circumflex artery
48
Q

What is the basic purpose of rotator cuff muscles?

A

Pull humeral head into glenoid fossa
Additional stability to glenohumeral joint

49
Q

Treatment of rotator cuff tendinitis?

A

Rest , analgesia (pain relief without losing consciousness by painkillers)
Steroid injection or surgery

50
Q

Which harmone is in steroid injection?

A

Steroid injections contain synthetic versions of the hormone cortisol,
which is a type of steroid hormone produced by the adrenal gland.

Cortisol has anti-inflammatory and immunosuppressive effects, which is why it is used in steroid injections to reduce inflammation and swelling in various parts of the body.

Anatomy Muscles (8 decks)

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