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ANAT315 > the shoulder and proximal upper extremity > Flashcards

the shoulder and proximal upper extremity Flashcards

1
Q

what are the muscles that compose the anterior part of the shoulder?

A
  • Pectoralis Major
  • Deltoid
  • Subscapularis
  • subclavius
  • pectoralis minor
  • serratus anterior
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2
Q

Pectoralis Major
origin
insertion
action?

A

origin: medial clavicule and sternal head
insertion: lateral lip of the intertubercular groove of the humerus
action: GH flexion, Adduction and internal rotation

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3
Q

Deltoid
origin
insertion
action?

A

origin: lateral third of the clavicle, acromion and spine of the scapula
insertion: deltoid tuberosity of the humerus
action:
1) anterior fibers: GH flexion and medial rotation
2) middle fibers: GH abduction
3) posterior fibers: GH extension and lateral rotation

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4
Q

Subscapularis
origin
insertion
action?

A

origin: subscapular fossa
insertion: lesser tubercule of the humerus
action: internal rotation of the GH joint

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5
Q

subclavius
origin
insertion
action?

A

origin: costal cartilage of rib I
insertion: inferior surface of clavicle
action: depression of the clavicle

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6
Q

pectoralis minor
origin
insertion
action?

A

origin: ribs 3-5
insertion: coracoid process of the scapula
action: depression of the scapula

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7
Q

serratus anterior
origin
insertion
action?

A

origin: Lateral border of ribs I-VIII
insertion: anteromedial border of the scapula
action: protraction (abduction) and depression of the scapula

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8
Q

what anterior shoulder muscles act on the GH joint?

A
  • deltoid
  • pectoralis major
  • subscapularis
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9
Q

what anterior shoulder muscles act on the “scapulothoracic joint”?

A
  • pectoralis minor
  • subclavius
  • serratus anterior
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10
Q

what muscles make up the rotator cuff? do they belong to the anterior or posterior side of the shoulder?

A
  • subscapularis (anterior)
  • supraspinatus (posterior)
  • infraspinatus (posterior)
  • teres minor (posterior)
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11
Q

what is the acronym to recall the rotator cuff muscles?

A

SItS muscles

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12
Q

what is the common function shared by the muscles of the rotator cuff?

A

they create a cuff around the GH joint and stabilize it.

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13
Q

what are some joint components found around the subscapularis muscle?

A

we have 2 different bursaes to relieve frictions

  • subtendinous bursa of subscapularis
  • subcoracoid bursa to reduce friction between the muscle and the coracoid process which sits rights above
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14
Q

Supraspinatis
origin
insertion
action?

A

origin: supraspinous fossa of the scapula
insertion: greater tubercule of the humerus (superior facet)
action: initiates arm abduction at the GH joint for the first 30 degrees of motion

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15
Q

what is the name of the bursa found next to the supraspinatus muscle? why?

A

-the subacromial bursa prevents the belly of the muscle from being caught in the acromion
there is also lateral to it the subdeltoid bursa.

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16
Q

Infraspinatus
origin
insertion
action?

A

origin: Infraspinous fossa of the spine of the scapula
insertion: greater tubercules of the humerus (middle facet)
action: external rotation of the arm

17
Q

teres minor
origin
insertion
action?

A

origin: Lateral superior border of the scapula
insertion: greater tubercule of the humerus (inferior facet)
action: external rotation of the arm

18
Q

where is the subacromial bursa located?

A

right above the tendon of the supraspinatus and below the acromion on the posterior side of the shoulder

19
Q

where is the subcoracoid bursa located?

A

above the subscapularis muscles and beneath the coracoid process on the anterior side of the shoulder

20
Q

where is the subtendinous burda of subscapularis located?

A

on the anterior inferior side of the shoulder between the subscapularis muscle and the tendon of the bicep brachii

21
Q

what are the posterior muscles of the shoulder excluding those of the rotator cuffs?

A
  • Teres Major
  • levator scapulae
  • Rhomboid minor and major
  • trapezius
  • latissimus dorsi
22
Q

Teres Major
origin
insertion
action?

A

origin: lateral (inferior) border of the scapula
insertion: medial lip of the interbercular groove on the humerus
action: extension, addiction and internal rotation of the GH joint

23
Q

the greater tubercule is a common insertion to what?

A

3 of the 4 muscles of the rotator cuff

SIt

24
Q

what is the triangular space bordered by? what does this space contain?

A
  • teres minor
  • tricep brachii long head
  • teres major

this space contains the curcymflex scapular artery

25
Q

what is the quadrangular space bordered by? what does this space contain?

A
  • teres minor
  • proximal humerus
  • Teres major
  • triceps brachii long head

contains: auxillary nerve and posterior circumflex humeral artery

26
Q

Levator Scapulae
origin
insertion
action

A

origin: TPS CI-CIV
insertion: superomedial boarder of the scapula
action: elevation and downwards rotation of the scapula

27
Q

Rhomboid minor and major
origin
insertion
action?

A

origin: SP’s CVII-TV
insertion: medial boarder of the scapula
action: retraction (Adduction) of the scapula
slight contibution to the elevation and downwards rotation of the scapula

28
Q

what type of back muscles are the levator scapulae and the rhomboid minor and major?

A

they are part of the second superficial layer of the back’s extrinsic muscles

29
Q 
Trapezius
origin
insertion
action
innervation
blood supply
A

origin: external occipital protuberance, ligamentum of nuchae, SPs CVII-TXII
insertion: spine of the scapula, acromion and clavicle
action:
upper fibers –> elevate the scapula
middle fibers –> retraction (adduction) and upward rotation of the scapula
lower fibers –> upwards rotation of the scapula during adduction of the arm during depression of the scapula
innervation: spinal accessory nerve C11
blood supply: transverse cervical artery

30
Q

Latissimus Dosi
origin
insertion
action

A

origin: SPs of TVI-LV,
sacrum, illiac crest, throacolumbar apneurosis
insertion: floor of the interbercular groove of the humerus
action: extension, adduction and internal rotation of the arm at the GH joint.

31
Q

the intertubercular groove is a common insertion for which muscles?

A
  • Pectoralis Major
  • Latissimus Dorsi
  • Teres Major
32
Q

what acronym(s) can you use to recall the insertions on the intertubercular groove?

A

-PLT
or
-A miss between 2 majors

33
Q

what is the trianglular interval bordered by? what does this space contain?

A
  • Teres Major
  • long head of the tricep muscle
  • lateral head of the tricep muscle

conains: the deep brachial artery and the radial nerve

ANAT315 (12 decks)

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