Lecture 12 - Musculoskeletal 1 Flashcards

1
Q

which is more ‘important’ in terms of the brain processing power, the upper limb or the lower limb?

A

upper, since it has a larger representation of the upper limb on the sensory and motor homunculus

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2
Q

why are our upper limbs so important?

A

interaction with our environment gave us success

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3
Q

the upper limb is all about?

A

movement

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4
Q

where does the upper limb articulate with the axial skeleton?

A

at the sternoclavicular joint, which is between the manubrium (sternum) and the clavicle

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5
Q

everything between the connection with the axial skeleton and the shoulder joint is called?

A

the pectoral girdle, spans from shoulder to shoulder, so one arm

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6
Q

what is the anatomy arm?

A

between the shoulder and the elbow joint
- arm aka brachium

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7
Q

what is the forearm aka?

A

antebrachium

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8
Q

carpals make up the?

A

wrist

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9
Q

how can we best describe the function of the pectoral girdle?

A

a mobile base that adds to the plane of movement

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10
Q

how is the upper body made for movement?

A

in comparison to the hip (which has only immobile joints) the upper body is a very mobile base due to synovial joints there

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11
Q

what is the anterior and posterior movement of the scapula called?

A

protraction (anteriorly)
retraction (posteriorly)

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12
Q

what is the superior and inferior movement of the scapula called?

A

elevation and depression

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13
Q

what is scapula inferior and superior rotation

A

try wave down an airplane

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14
Q

what are the two things that scapula abduction could be

A

superior rotation or protraction

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15
Q

what are the two things that scapula adduction could be?

A

inferior rotation or retraction

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16
Q

why dont we use the terms scapular abduction and adduction?

A

because they are subjective

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17
Q

how do we name joints?

A

proximal articulating surface, then distal articulating surface

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18
Q

where is the acromio-clavicular joint?

A

between the clavicle and the acromion (the sternum)

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19
Q

what bone is the strut between our scapula and our axial skeleton?

A

clavicle

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20
Q

what does it mean to say the clavicle is a strut for the scapula?

A

there are big muscles on the anterior and posterior sides of our scapula that are are under tonal contraction, and without the clavicle, the scapula would be pulled towards the axial skeleton/ribcage. this allows more movement of the scapula

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21
Q

what are the roughened areas of the inferior clavicle bone?

A

areas where ligaments attach to
- costoclavicular ligament attachment
- subclavian groove muscle attachment
- coracoclavicular ligament attachment

22
Q

what is the main difference in the clavicle from the superior view?

A

deltoid tubercule, where the deltoid origin is.

23
Q

what muscles attach onto the clavicle?

A

the deltoid (clavicle is the origin)
trapezius (clavicle is the insertion)
pectoralis major (clavicle is origin)

24
Q

where is our clavicle most often fractured?

A

where there are no muscled attached

25
Q

what is treatment for a greenstick fracture vs a break in the clavicle?

A

greenstick - sling, take the weight off the arm
broken: plates and screws to hold in place while heals

26
Q

what do soft clavicles do?

A

not act as a very good strut

27
Q

what are the three angles of the scapula?

A
  • superior angle
  • inferior angle
  • glenoid fossa (lateral)
28
Q

what are the three borders of the scapula?

A
  • superior border
  • medial border
  • lateral border
29
Q

which border contains most muscle attachments of the scapula?

A

the lateral border

30
Q

what are the 3 protuberances of the scapula?

A
  • coracoid ‘crows beak’
  • acromion (continuous with spine along posterior side of scapula)
  • spine
31
Q

what are the 3 surfaces of the scapula?

A
  • supraspinous fossa
  • infraspinous fossa
  • subscapula fossa
32
Q

what group of muscles are associated with the 3 surfaces of the scapula?

A

the rotator cuff muscles

33
Q

describe the sternoclavicular joint

A
  • saddle shaped synovial joint
  • 30º rotation (so pretty mobile)
34
Q

what makes the sternoclavicular joint a complex joint?

A

menisci of the sternoclavicular joint

35
Q

what is the only connection between the two sides of your pectoral girdle

A

interclavicular ligament

36
Q

what provides the most strength between the clavicle and the sternum?

A

costoclavicular ligament
- from 1st rib to underside of clavicle

37
Q

what is the main function of the subclavius muscle in day to day life?

A

shunt muscle
prevents the dislocation of the sternoclavicular joint by pulling clavicle back towards the midline

38
Q

why do we need an acromioclavicular joint

A

if we didn’t have one, when you move the clavicle, the scapula would be forced into rotation
- gives and extra degree of movement

39
Q

what makes the acromioclavicular joint complex?

A

a wedge shaped intra-articular disc
- also fibrocartilage

40
Q

which muscles support the AC joint?

A

the deltoid and the trapezius

41
Q

where is the coracoclavicular ligament

A

connects the clavicle to the scapula, but is not really a part of the acromioclavicular joint

42
Q

what is the function of the coracoclavicular ligament

A
  • very strong
  • used to passively hold the scapula under the clavicle
43
Q

which muscle actively moves and stabilises the scapula?

A

the trapezius

44
Q

what is the conceptual joint of the pectoral girdle?

A

where the medial border of the scapula moves against the thorax due to muscles and ligaments acting on it
- stabilises the scapula
- no cartilage or synovial fluid

45
Q

what is the origin and insertion of the pectoralis major?

A

origin: clavicular head and sternocostal head
insertion: intertubercular groove

46
Q

what are the three movements of the pectoralis major?

A
  • adducts the humerus
  • internally rotates the humerus
  • can help protract scapula by pulling on humerus (2º action)
47
Q

what is the origin and insertion of the subclavius?

A

origin: costal cartilage of the 1st rib
insertion: clavicle

48
Q

what are the primary movements of the subclavius?

A
  • braces the clavicle
  • weak depressor of the scapula
49
Q

what is the origin and insertion of the pectoralis minor?

A

origin: anterior-lateral sufaces of ribs 3-5
insertion: coracoid process of the scapula

50
Q

what is the brachial plexus?

51
Q

what is the origin and insertion of the serratus anterior?

A

origin: ribs
insertion: medial border of the scapula
- packs a punch

52
Q

what are the primary movements of the serratus anterior?

A

protracts scapula
lower fibres help superiorly rotate scapula