Session 1 - Pectoral Region Flashcards Preview

Semester 2 - MSK > Session 1 - Pectoral Region > Flashcards

Flashcards in Session 1 - Pectoral Region Deck (24)
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1
Q

Name the four sections of the pectoral region we need to know

A
  • Pectoralis Major
  • Pectoralis Minor
  • Serratus anterior
  • Subclavius Muscles
2
Q

What is the name of the muscle in the image?

A

Pectoralis Major

3
Q

Name A and and give the bone it attaches to

A

Clavicular head

Attaches to the clavicle (predictably)

4
Q

Name B and give the bones it attaches to

A

Sternocostal head

Attaches to the sternum and ribs

5
Q

What do fibres from both A and B attach to?

A

The intertubecular groove of the humerus

6
Q

Describe how the two heads A and B can work and what bone they mediate the movement of?

Give a mechanism specific to A

A

1) Two heads can work independently and synergistically.

Together they act to adduct (draw towards the mid-line) and medially rotate (rotate towards the center) the humerus at the shoulder

Draws scapula anteriorly and inferiorly

2) The clavicular head also performs flexion (decrease in joint angle)

7
Q

What is the muscle in the picture innervated by?

A

The medial and lateral pectoral nerves, derives from the brachial plexus (network of nerve fibres).

C5-C8 and T1

8
Q

What is the name of muscle A in the image?

A

Pectoralis Minor

9
Q

Where does the muscle lie?

A

Posterior to the pectoralis major

10
Q

What do the pectoralis major and pectoralis minor together form?

A

The anterior wall (front) of the axilla

11
Q

Where does muscle A originate from?

A

The anterior surfaces of ribs 3-5

12
Q

Name B, where muscle A attaches

A

The corocoid process of the scapula

13
Q

What lies under muscle A?

A

Vessels passing into the upper limb

14
Q

What is the main action of muscle A?

A

Stabilises scapula by drawing it inferiorly and anteriorly against the thoracic wall

15
Q

What is muscle A innervated by?

A

The medial pectoral nerve

16
Q

What is muscle A?

A

The serratus anterior

17
Q

Where is muscle A found and what does it form?

A

Laterally in the chest and forms the medial wall of the axilla

18
Q

What does the muscle A attach to?

A

The costal (rib facing) surface of the medial border of the scapula and originates from 1st - 8th rib

19
Q

What is the main innervation of muscle A?

A

Long thoracic nerve (C5, C6, C7)

20
Q

What is the main action of muscle A?

A

To rotate the scapula, allowing the arm to be raised over 90 degrees.

Holds scapula against ribcage, useful when upper limb reaches anterioly

21
Q

Name muscle A

A

Subclavius muscle

22
Q

What is the attachment of muscle A?

A

Junction of 1st rib and costal cartilage

Attached to clavicle

23
Q

What is the main innervation of A?

A

Nerve to subclavius (C5, C6)

24
Q

What is the main action of muscle A?

A

Anchors and depresses clavicle