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MSK > 15B - Pectoral Girdle Muscles > Flashcards

15B - Pectoral Girdle Muscles Flashcards

1
Q

How do you injure the AC joint?

A

Tackling

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2
Q

What is the conceptual joint?

A

Is a functional not true joint between the medial scapula and thorax. Braces the scapula onto the thorax for stability. Has lots of fluid of lubrication

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3
Q

What are the muscles that go from axial skeleton to pectoral girdle?

A

Pectoralis MINOR, subclavius, serratus anterior, trapezius, rhomboid major and minor, levator scapulae

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4
Q

Muscles from axial skeleton to humerus?

A

Pectoralis Major, Latissimus Dorsi

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5
Q

Muscles from pectoral girdle to humerus?

A

Supraspinatus, Infraspinatus, Teres Minor and Major, Subscapularis, Deltoid, Coracobrachialis, Biceps and Triceps Brachii

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6
Q

What do I need to know about these muscles?

A

NERVE. Primary actions. General origins and insertions

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7
Q

What is Trapezius O and I?

A

O: broad from skull to T12 spinous processes
I: anatomical horseshoe (clavicle, acromion, spine)
> superior: clavicle
> middle: acromion
> inferior: spine of scapula

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8
Q

Action of trapezius?

A

All fibres together: retract
Superior: Elevates
Middle: Retracts
Inferior: Depresses

Superior and Inferior Fibres: STRONG superior rotation

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9
Q

Nerve to trapezius

A

Accessory Nerve (CN 11)

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10
Q

Levator Scauplae?

A

O: TRANSVERSE processes of upper cervical vertebrae
I: Superior angle of scaupla

> Dorsal Scapula Nerve
Elevates
O and I can swap to laterally flex head

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11
Q

Rhomboid Major and Minor

A

O: Spinous processes of lower cervical and upper thoracic vertebra
I: Medial Border of Scapula

> Dorsal Scapula Nerve
Retracts scapula

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12
Q

Latissimus Dorsi?

A

O: T7 - S5, iliac crest, lower ribs
I: FLOOR of intertubercular groove of anterior humerus

> adducts and internally rotates arm. Depress scapula
Thoracodorsal Nerve

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13
Q

Significance of lat dorsi origin including iliac crest?

A
  • is of lower limb. This doesn’t move so is a stable base to anchor the upper limb to (mechanical advantage)
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14
Q

What does lat dorsi form?

A

The posterior fold of the armpit/axilla.

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15
Q

Pectoralis Major?

A

O: Sternocostal head and clavicular head
I: Lateral Lip of intertubercular groove

> internally rotates arm and adducts (and protract)
Lateral and Medial Pectoral Nerves

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16
Q

When do you use pectoralis major?

A

Climbing trees, using crutches.

17
Q

Pectoralis Minor?

A

O: Ribs 3,4,5
I: Coracoid

> Depresses scapula and is a weak stabiliser i.e. during heavy breathing it locks the scapula and pulls the ribs up
Medial Pectoral Nerve

18
Q

Subclavius

A

O: Costal cartilage of first rib
I: Subclavian groove of clavicle

> Braces clavicle and is a weak depressor
C5 nerve

19
Q

Where does the NM bundle of the upper limb run? Why is this significant?

A

Below pectoralis minor - if you sleep woth your arm abducted then you can stretch the BP under the coracoid with pec minor in front resulting in a numb arm

20
Q

Where does the Medial Pectoral Nerve run?

A

Through pectoralis minor to major

21
Q

What is serratus anterior known as?

A

Boxers muscle

22
Q

Serratus Anterior?

A

O: Anterior Lateral Thorax
I: Medial border of scapula

> protracts scapula
LOWER fibres help superiorly rotate the scapula
Long Thoracic Nerve

23
Q

Where does serratus anterior insert?

A

Below the rhomboids at the medial scapula

24
Q

What results after damage to the Long Thoracic Nerve?

A

Winged scapula.

25
Q

What muscles elevate the scapula?

A

Elevator Scapulae, Superior Fibres of Trapezius

26
Q

What muscles depress the scapula?

A

Inferior Trapezius, Subclavius (weak), Pec Minor, Lower Fibres of Lat Dorsi

27
Q

What muscles protract scapula?

A

Serratus anterior and pec major

28
Q

What muscles retract scapula?

A

Rhomboids, trapezius total and middle fibres,

29
Q

What muscles superiorly rotate the scapula?

A

Inferior and superior fibres of trapezius, lower fibres of serratus anterior

MSK (29 decks)

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