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MEDSCI 201 > Lecture 12: Pectoral Girdle > Flashcards

Lecture 12: Pectoral Girdle Flashcards

1
Q

What is the upper limb made up of?

A

arm, forearm, hand and shoulder (pectoral girdle)

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2
Q

The shoulder joint has the ___ range of motion and is the ___ stable joint. This means it requires ____ of muscles.

A

widest; least; lots

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3
Q

Whats the fancy word that refers to the arm?

A

brachium

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4
Q

If you puff your chest out, what type of movement does that do to the pectoral girdle?

A

retraction

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5
Q

If you pull your shoulder forward, what type of movement does the pectoral girdle do?

A

protraction

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6
Q

If you shrug, your pectoral girdle is ___ and if you relax back down your pectoral girdle is ___

A

elavated: depressed

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7
Q

If you raise your arm, you are ____ rotating your glenoid fossa of your scapula.

A

superiorly

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8
Q

If you clap your hands behind you, you are ____ rotating your glenoid fossa of your scapula.

A

inferiorly

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9
Q

What main bones makes up the pectoral girdle?

A

clavicle and scapula

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10
Q

What are the main bone structures of the clavicle?

A

deltoid tubercle, costoclavicular roughened area (for ligament attachment), subclavian groove (for muscle attachment

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11
Q

What are the 3 angles of the scapula?

A

superior angle, inferior angle, glenoid fossa

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12
Q

What are the 3 borders of the scapula?

A

superior border, medial border, lateral border

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13
Q

What are the 3 surfaces of the scapula?

A

subscapula fossa (anterior view), infraspinous fossa, supraspinous fossa (both posterior view)

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14
Q

What are the 3 protuberene of the scapula?

A

coracoid (seen on anterior), acromion and spine (seen on posterior)

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15
Q

What are the two main main joints of the pectoral girdle?

A

sternoclavicular joint

Acromioclavicular

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16
Q

Describe the sternoclavicular joint

A

saddle shaped synovial joint that sits between the medial end of the clavicle and the manubrium (sternum)

17
Q

What are the four most important ligaments of the sternoclavicular joint?

A

Posterior and anterior sternoclavicular ligament

Interclavicular and consto-clavicular ligament (this is the strongest)

18
Q

Where is the acromioclavicular joint located?

A

between the lateral end of the clavicle and the medial end of the acromion

19
Q

what lies inside the acromioclavicular joint and what surrounds it?

A

intra-articular disc; acromio-clavicular ligament

20
Q

What two muscles help strengthen the AC joint?

A

Trapezius and deltoids

21
Q

What ligament strengthens the AC joint (and the acromioclavicular ligament)?

A

coraco-clavicular ligament

22
Q

What is the insertion and origin of the subclavius?

A 
O= costal cartilage of the first rib 
I= clavicle
23
Q

What is the insertion and origin of the pectoralis minor?

A 
O= 3rd, 4th and 5th rib
I= Coracoid process of the scapula
24
Q

Primary action of the subclavius?

A

“braces” the clavicle

25
Q

Primary action of the pectoralis minor?

A

depresses the scapula

26
Q

What is the insertion and origin of the serratus anterior ?

A 
O= ribs 1- 8/9
I= medial border of the scapula
27
Q

Primary actions of the serratus anterior?

A
  • protracts scapula

- lower fibres help superiorly rotate scapula

28
Q

What is the insertion and origin of the three regions of the trapezius?

A

Superior
O= Skull to mid cervicle verterbrae
I= clavicle

Middle
O=beginning of thoracic verterbrae to mid thoracic verterbrae
I= acromion of scapula

Inferior
O= mid to end of thoracic vertebrae
I= spine of the scapula

29
Q

Primary action of the traps

A 
altogether= retracts scapula 
superior= elevate scapula
mid= retract scapula
inferior= depress scapula
superior + inferior = superior rotation of scapula
30
Q

What is the insertion and origin of the levator scapulae

A 
O= cervical vertebraes
I= coracoid process of the scapula
31
Q

Primary action of the levator scapulae

A

elevate scapula

32
Q

What are the insertion and origin of the major and mino rhomboids?

A 
O= beginning of the thoracic to mid thoracic
I= medial border of the scapula
33
Q

Primary action of rhomboids

A

Retract scapula

34
Q

What is the insertion and origin of the pectoralis major?

A 
O= clavicular head AND the sterno-costal head
I= lateral lip of the inter-tubercular groove of humerus
35
Q

primary action of the pectoralis major

A
  • adducts humerus
  • medially rotates humerus
  • assist in protraction of scapula (flys on cables)
36
Q

what is the insertion and origin of the latissimus dorsi?

A 
O= lumbar verterbrae and iliac crest
I= floor of inter-tubercular groove on the anterior surface of the humerus
37
Q

Primary action of latissium dorsi

A
  • adducts the humerus (lat pulldowns)
  • medially rotates humerus
  • lower fibres help depress scapular by pulling on humerus
38
Q

What is the apopneurosis of the latissimus dorsi?

A

It is the flat tendon seen on your lower back

MEDSCI 201 (7 decks)

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