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Fundementals Musculoskeletal > Week 6 > Flashcards

Week 6 Flashcards

1
Q

What kind of joint is the shoulder joint?

A

Ball and socket joint

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2
Q

Characteristics of the shoulder joint

A
  • one of the most mobile yet unstable joints in the body
  • Movement in 3 planes
    Sagittal, frontal, transverse
    3 degrees of freedom
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3
Q

What is the function of the rotator cuff?

A
  • Helps to rotate the shoulder against the glenoid fossa during shoulder motion
  • Stabilize the head of humerus during shoulder joint motion
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4
Q

True or false: the rotator cuff is more a generator of rotation than a facilitator of rotation

A

False

More facilitators of rotation as opposed to generators of rotation

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5
Q

What is the origin of the anterior deltoid?

A

Lateral 1/3 of clavicle

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6
Q

What is the insertion of the anterior deltoid?

A

Deltoid tuberosity

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7
Q

What is the action that the anterior deltoid performs?

A
  • Abduction
  • Flexion
  • Medial rotation
  • Horizontal adduction
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8
Q

What are some characteristics/functions of the anterior deltoid

A

Front portion of deltoid fibres

Deltoid is its own antagonist

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9
Q

What is the origin of the middle deltoid?

A

Acromion process

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10
Q

What is the insertion of the middle deltoid?

A

Deltoid tuberosity

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11
Q

What action does the middle deltoid perform?

A

Abduction

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12
Q

What is the origin of the posterior deltoid?

A

Spine of scapula

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13
Q

What is the insertion of the posterior deltoid?

A

Deltoid tuberosity

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14
Q

What action does the posterior deltoid perform?

A
  • Abduction
  • Extension
  • Hyperextension
  • Lateral rotation
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15
Q

What are some characteristics/functions of the posterior deltoid?

A
  • Back portion of deltoid fibres

-Runs on a diagonal (obliquely)

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16
Q

What is the origin of the pectoralis major?

A

Medial 1/3 clavicle

Sternum

Costal cartilage of ribs 1-6

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17
Q

What is the insertion of the pectoralis major?

A

Bicipital groove (lateral lip)

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18
Q

What action does the pectoralis major perform?

A

Shoulder flexion (first 60 degrees)

-Shoulder extension (first 60 degrees)

-Adduction

  • Medial rotation

-Horizontal adduction

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19
Q

What is the origin of the latissimus dorsi?

A
  • Spinous process of T7-L5
  • posterior sacrum
  • iliac crest
  • lower 3 ribs
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20
Q

What is the insertion of the latissimus dorsi?

A

Bicipital groove

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21
Q

What action does the latissimus dorsi perform?

A
  • Shoulder extension
  • Adduction
  • Medial rotation
  • Hyperextension*
22
Q

What are some characteristics/functions of the latissimus dorsi?

A

Broad, sheet-like muscle
Superficial

23
Q

What is the origin of the teres major?

A

Inferior lateral border of scapula

24
Q

What is the insertion of the teres major?

A

Bicipital groove, below lst tubercle under latissimus dorsi

25
What action does the teres major perform?
Extension, adduction, and medial rotation
26
What are some characteristics/functions of the teres major?
- Follows latissimus dorsi to humerus Nicknamed as latissimus dorsi’s little helper
27
What are the rotator cuff muscles?
SITS muscle S - supraspinatus I - infraspinatus T – teres minor S – subscapularis
28
What is the origin of the supraspinatus?
Supraspinous fossa
29
What is the insertion of the supraspinatus?
Greater tubercle
30
What action does the supraspinatus perform?
Abduction and stabilizes shoulder
31
What are some characteristics/functions of the supraspinatus?
Above the spine Passes underneath acromion to its insertion doesn’t generate rotation Initiates abduction (helps it get started before deltoid takes over) All rotator cuff muscles are weak
32
What is the origin of the infraspinatus?
Infraspinous fossa
33
What is the insertion of the infraspinatus?
Greater tubercle
34
What action does the infraspinatus perform?
lateral rotation and horizontal abduction
35
What is the origin of the teres minor?
Lateral border of scapula
36
What is the insertion of the teres minor?
Greater tubercle
37
What action does the teres minor perform?
lateral rotation and horizontal abduction
38
What are some characteristics/functions of the teres minor?
Very similar to infraspinatus Attaches to back part of humerus just below infraspinatus
39
What is the origin of the subscapularis?
Subscapular fossa
40
What is the insertion of the subscapularis?
Lesser tubercle
41
What action does the subscapularis perform?
Medial rotation of humerus
42
What are some characteristics/functions of the subscapularis?
Starts out on the anterior side of the scapula Horizontal line of pull --> prime mover for medial rotation as it inserts on lesser tubercle
43
What is the origin of the coracobrachialis?
coracoid process
44
What is the insertion of the coracobrachialis?
medial humerus halfway down
45
What action does the coracobrachilais perform?
Stabilizes shoulder Assists in flexion
46
What are some characteristics/functions of the coracobrachialis?
Weak flexor Vertical line of pull
47
What is the difference between a first class, second class, and third class lever?
First class lever: has the fulcrum in the middle Second class lever: have the load in the middle Third class lever: has the effort in the middle Levers: refer to a bone Fulcrum: refers to the joint that is formed by the connection between two or more bones. Effort: refers to the force generated by the contraction of the muscles in the lever system
48
What is the most popular type of lever in the body?
Third class levers
49
What is a force arm?
the distance between the point where the force or effort is applied and the axis. Also called moment arm
50
What is a resistance arm?
the distance between the point where the resistance or load is applied and the axis.
51
What is a joint capsule made of?
- Thin wall - Outer fibrous membrane - Inner synovial membrane - Attaches around rim of glenoid fossa and anatomical neck of humerus

Fundementals Musculoskeletal (9 decks)

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