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Anatomy of the upper limb > Intrinsic Muscles of the Glenohumeral Joint > Flashcards

Intrinsic Muscles of the Glenohumeral Joint Flashcards

1
Q

What are the origins of Deltoid?

A
  • crest of SPINE of SCAPULA
  • lateral margin of ACROMION
  • lateral 1/3 of CLAVICLE
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2
Q

What are the insertions of Deltoid?

A

Deltoid tuberosity of HUMERUS?

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3
Q

What are the movements Deltoid participates in?

A
  • abducts arm
  • flex arm
  • extend arm
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4
Q

What is the innervation of Deltoid?

A

Axillary nerve (C5, C6)

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5
Q

What are the muscles of the Rotator Cuff?

A
  • Supraspinatus
  • Infraspiantus
  • Teres Minor
  • Subscapularis
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6
Q

What are the origins of SupraSpinatus?

A

Supraspinous fossa of the scapula

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7
Q

What are the insertions of Supraspinatus?

A

-most superior facet on the greater tubercle of the humerus

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8
Q

What does the supraspinatus muscle do?

A
  • Initiates the abbduction of the arm to 15 degrees

- Stabilizes the glenohumeral joint

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9
Q

What is the nerve supply of supraspinatus?

A

Suprascapular Nerve (C5, C6)

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10
Q

What is the origin of Infraspinatus?

A

Infra spinatous fossa of the scapula

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11
Q

What is the insertion of Infraspinatus?

A

MIDDLE facet on the posterior surface of the greater tubercle of the humerus.

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12
Q

What is the nerve supply of infraspinatus?

A

Suprascapular nerve [C5, C6]

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13
Q

What are the main actions of the Infraspinatus Muscle?

A

Lateral Rotation of the arm

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14
Q

What are the origins of Teres MINOR?

A

Middle part of lateral border of scapula

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15
Q

What are the insertions of Teres MINOR?

A

Inferior facet on greater tubercle of the humerus

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16
Q

What is the nerve supply of Teres MINOR?

A

Axillary Nerve (C5, C6)

17
Q

What is the main action of teres minor?

A

Lateral rotation of the arm

18
Q

What is the origin of Teres MAJOR?

A

Inferior angle of Scapula

19
Q

What is the insertion of Teres Major?

A

Medial Lip of intertubercular groove (bicipital groove) of humerus

20
Q

What is the nerve supply of Teres Major?

A

Lower subscapular nerve (C6)

21
Q

What is the action of Teres MAJOR?

A

Adducts medially

rotates humerus

22
Q

What are the origins of subscapularis?

A

Subscapular fossa of scapula

23
Q

What are the insertions of subscapularis?

A

Lesser tubercle of humerus

24
Q

What is the nerve supply of subscapularis?

A

Upper (C5) and lower (C6) subscapular nerves

25
Q

What is the action of subscapularis?

A

Medial rotator and adductor of humerus

stabilize gleno-humeral joint

26
Q

What are the boundaries of the quadrangular space?

A 
Superiorly = Teres Minor
Inferiorly = Teres Major
Medially = Long head of Triceps Brachii
Laterally = Humerus
27
Q

Which artery and nerve are located within the quadrangular space?

A
  • Axillary Nerve (C5, C6)

- Posterior circumflex artery + vein

28
Q

Which muscles is responsible for the initiation of abduction?

A

Supraspinatous

29
Q

What is the origin of the long head of Biceps Brachii?

A

supraglenoid tubercle of scapula

30
Q

What is the origin of the short head of Biceps Brachii?

A

coracoid process of scapula

31
Q

What is the insertion of biceps brachii?

A

Radial tuberosity

32
Q

What is the origin of the long head of triceps brachii?

A

infraglenoid tubercle of scapula

33
Q

What is the insertion of Triceps Brachii?

A

Olecranon Process of Ulna

34
Q

Contraction of which muscles produce protraction of the scapula?

A
  • pectoralis Major
  • Pectoralis Minor
  • Serratus Anterior
35
Q

Contraction of which muscles produce retraction of the scapula?

A

Rhomboid Major
Rhomboid minor
Latissimus dorsi
Trapezius

36
Q

Contraction of which muscles cause elevation of the scapula?

A

Trapzius
Levator Scapulae
Rhomboid Major / minor

37
Q

Contraction of which muscles cause depression of the scapula?

A 
Pectoralis Major
Pectoralis Minor
Latissimus dorsi
Trapezius
Serratus Anterior
38
Q

Lateral Rotation is caused by the contraction of which muscles?

A

Infraspinatus

Teres Minor

Anatomy of the upper limb (18 decks)

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