1.4.5. Extrinsic Muscles of the Shoulder Flashcards Preview

3rd Year - MSK Upper Limb Anatomy > 1.4.5. Extrinsic Muscles of the Shoulder > Flashcards

Flashcards in 1.4.5. Extrinsic Muscles of the Shoulder Deck (36)
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1
Q

What is the Definition of “Extrinsic Muscles of the Shoulder”?

A

Muscles which Originate from the Torso and Attach to the Bones of the Shoulder

2
Q

What are the 3 Bones of the Shoulder?

A
  1. Clavicle
  2. Scapular
  3. Humerus
3
Q

What are the “Extrinsic Muscles of the Shoulder” also known as?

A

Superficial Back Muscles

4
Q

How many layers are the Extrinsic Muscles of the Shoulder are there?

A

2

5
Q

What are the 2 Layers of the Extrinsic Muscles of the Shoulder?

A
  1. Superficial

2. Deep

6
Q

What are the 2 Superficial Extrinsic Muscles of the Shoulder?

A
  1. Trapezius

2. Latissimus Dorsi

7
Q

How is the Trapezius described?

A
  1. A Broad, Flat, Triangular Muscle - The muscles on each side forming a Trapezoid Shape
  2. The most Superficial of all the Back Muscles
8
Q

Where does the Trapezius attach onto the Torso?

A
  1. Base of the Skull (Where this Originates from)
  2. Nuchal Ligament
  3. Spinous Processes of C7 to T12
9
Q

Where does the Trapezius attach onto the Shoulder Bones?

A
  1. Clavicle
  2. Acromion
  3. Spine of the Scapula
10
Q

What is the Motor Innervation of the Trapezius?

A

Accessory Nerve (Cranial Nerve XI)

11
Q

What provides the Proprioception Fibres to the Trapezius?

A

C3 and C4 Spinal Nerves

12
Q

What are the 3 Divisions (Bands) of the Trapezius?

A
  1. Upper (Superior)
  2. Middle
  3. Lower (Inferior)
13
Q

What is the function of the Upper (Superior) Fibres of the Trapezius?

A
  1. Elevation of the Scapula

2. Rotation of the Scapula during Abduction of the Arm

14
Q

What is the function of the Middle Fibres of the Trapezius?

A

Retraction of the Scapula

15
Q

What is the function of the Lower (Inferior) Fibres of the Trapezius?

A

Pull the Scapula Inferiorly

16
Q

How is the Latissimus Dorsi described?

A

Originating from the Lower Back and Covering a Large Area

17
Q

Where does the Latissimus Dorsi attach onto the Torso?

A
  1. Spinous Processes of T6 to T12
  2. Iliac Crest
  3. Thoracolumbar Fascia
  4. Inferior 3 Ribs (10, 11, 12)
18
Q
  1. Where does the Latissimus Dorsi attach onto the Shoulder Bones?
  2. What happens to the Fibres as they attach onto the Shoulder Bones?
A
  1. Intertubercular Sulcus of the Humerus

2. The Fibres converge into a Tendon

19
Q

What is the innervation of the Latissimus Dorsi?

A

Thoracodorsal Nerve

20
Q

What is the function of the Latissimus Dorsi?

A
  1. Extension of Upper Limb
  2. Adduction of the Upper Limb
  3. Medial Rotation of the Upper Limb
21
Q

Where are the Deep Extrinsic Muscles of the Shoulder Located?

A
  1. In the Upper Back

2. Deep to the Trapezius

22
Q

What are the 3 Deep Extrinsic Muscles of the Shoulder?

A
  1. Levator Scapulae
  2. Rhomboid Major
  3. Rhomboid Minor
23
Q

How is the Levator Scapulae described?

A

A Small, Strap-Like Muscle beginning in the Neck and Descending to Attach to the Scapula

24
Q

Where does the Levator Scapulae attach onto the Torso?

A

The Transverse Processes of C1 to C4

25
Q

Where does the Levator Scapulae attach onto the Shoulder Bones?

A

The Medial Border of the Scapula

26
Q

What is the innervation of the Levator Scapulae?

A

The Dorsal Scapula Nerve

27
Q

What is the function of the Levator Scapulae?

A

Elevate the Scapula

28
Q

Which, of Rhombod Major and Rhomboid Minor, is situated Superiorly?

A

Rhomboid Minor

29
Q

Where does the Rhomboid Major attach onto the Torso?

A

Spinous Processes of T2 to T5

30
Q

Where does the Rhomboid Major attach onto the Shoulder Bones?

A

Medial Border of the Scapula, between the:

  1. Spine of the Scapula
  2. Inferior Angle of the Scapula
31
Q

What is the innervation of the Rhomboid Major?

A

Dorsal Scapular Nerve

32
Q

What are the functions of the Rhomboid Major?

A
  1. Retracts the Scapula

2. Rotates the Scapula

33
Q

Where does the Rhomboid Minor attach onto the Torso?

A

Spinous Processes of C7 to T1

34
Q

Where does the Rhomboid Minor attach onto the Shoulder Bones?

A

Medial Border of the Scapula, at the Level of the Spine of the Scapula

35
Q

What is the innervation of the Rhomboid Major?

A

Dorsal Scapular Nerve

36
Q

What is the function of the Rhomboid Major?

A
  1. Retracts the Scapula

2. Rotates the Scapula

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