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MEDSCI 201 > Lecture 13: Shoulder Joint > Flashcards

Lecture 13: Shoulder Joint Flashcards

1
Q

What are the two bones involved in the shoulder joint?

A

Humerus and scapula

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2
Q

The scapula’s supraglenoid tubercle attaches what muscle?

A

long head bicep brachii

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3
Q

the scapula’s infraglenoid tubercle attaches what muscle?

A

long head tricep brachii

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4
Q

What is the surgical neck?

A

the diaphysis of humerus

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5
Q

How many greater tubercles are there?

A

3

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6
Q

How many lesser tubercles are there?

A

1

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7
Q

Where does the coracoclavicular ligament insert?

A

to the coracoid process of the scapula

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8
Q

Apart from the scapula, what are the other bones that interact with the head of the humerus?

A

Acromion and glenoid labrum (ring)

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9
Q

Where is the synovial capsule attached to?

A

around the glenoid labrum

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10
Q

What is the extracapsular ligament of the shoulder joint:

A

coraco-acromial, gaps between the coracoid and acromion

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11
Q

What is the intracapsular ligaments of the shoulder joint:

A

1) Coroco-humeral
2) Tranverse humeral (between greater and lesser tubercles)
3) Glenohumeral

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12
Q

What does a bursa do?

A

Prevents friction between bone and soft tissue and acts as a cushion

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13
Q

What are the main tendons involved in the shoulder joint

A

Subscapularis; supraspinatus; infraspinatus: bicep tendon; subscapularis

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14
Q

What does the sacciform synovial membrane do?

A

allows bicep brachii tendon to move up and down the humerus.

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15
Q

Explain what the caracoacromial arch does? (give me 2)

A

acts as a buffer and prevents superior dislocation

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16
Q

What are the rotator cuff muscles? (SIST)

A

supraspinatus
infraspinatus
subscapularis
teres minor

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17
Q

other than the rotator cuff muscles, what are 3 additional muscles that act on the shoulder joint?

A

Deltoid Major
teres major
coracobrachialis

18
Q

which rotator cuff muscle is only seen on the anterior

A

Supracapsularis

19
Q

What is the origin and insertion of the supraspinatus?

A

Origin: supraspinus FOSSA
Insertion: Superior FACET of Greater Tubercle

20
Q

What is the origin and insertion of the infraspinatus?

A

Origin: Infraspinatus FOSSA
Insertion: Middle FACET of Greater Tubercle

21
Q

What is the origin and insertion of the Teres minor?

A

Origin: Lateral boarder of the scapula
Insertion: Inferior FACET of Greater Tubercle

22
Q

What is the origin and insertion of the subcapsularis?

A

Origin: subscapular FOSSA
Insertion: LESSER tubercle

23
Q

What is the origin and insertion of the Deltoid?

A

Origin: anatomical horseshoe
Insertion: Deltoid tuberosity

24
Q

What is the main function of the subscapularis?

A

Internally rotates arm

25
Q

What is the main function of the supraspinatus?

A

Initiates the beginning of ABducts the arm

26
Q

What is the main function of the infraspinatus?

A

externally rotates arm

27
Q

What is the main function of the teres minor?

A

externally rotates arm

28
Q

What is the main function of the anterior fibres of the deltoids?

A

1) flex the shoulder

2) internally rotate arm

29
Q

What is the main function of the middle fibres (multipennate) of the deltoids? and why?

A

Adducts the arm. It waits until supraspinatus performs adduction the humerus to 15 degrees from the anatomical position before contracting.

30
Q

What is the main function of the posterior fibres?

A

1) extend the shoulder

2) externally rotate arm

31
Q

What is the origin and insertion of the middle fibres of the deltoid?

A

Origin: acromion
Insertion: deltoid tuberosity

32
Q

What two deltoid fibres assist middle fibres with adduction?

A

anterior and posterior. Its function depends on their spatial orientation of the insertion of the muscle, relative to the axis.

33
Q

What is the origin and insertion of teres MAJOR?

A

Origin: inferior angle and lateral border of the scapula (posterior side)
Insertion: anterior aspect of the humerus

34
Q

What is the main function of teres MAJOR?

A

1) internally rotates arm

2) extends shoulder

35
Q

what is the origin and insertion of the coracobrachialis?

A

Origin: coracoid process (anterior side)
Insertion: medial side of humerus

36
Q

What is the main function of coracobrachialis?

A

1) adduction of shoulder

2) its a shunt muscle

37
Q

what are the muscles that ABDUCT the arm?

A

supraspinatus

lateral deltoids

38
Q

What are the muscles that ADDUCT the arm?

7

A 
posterior deltoids 
anterior deltoids (anterior aspect)
pectoralis major (anterior aspect)
long head of tricepts
coracobrachialis (anterior aspect
teres major
latissimus dorsi
39
Q

What are the arm flexors? (4)

A

anterior deltoids
clavicular head of pectoralis major
coracobrachialis
bicep brachii

40
Q

What are the arm extensors? (5)

A 
posterior deltoids
teres major
latissimus dorsi 
long head of triceps
sternocostal portion of pectoralis major
41
Q

What muscles are responsible for INTERNAL rotation of the ARM?

A 
Pectoralis major
anterior deltoid
subscapularis
latissimus dorsi
teres MAJOR
42
Q

What muscles are responsible for EXTERNAL rotation of the ARM?

A

posterior deltoids
infraspinatus
teres MINOR

MEDSCI 201 (7 decks)

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