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Anatomy Muscles > Pectoral Region > Flashcards

Pectoral Region Flashcards

1
Q

Name muscles of pectoral region?

A
  1. Pectoralis Major
  2. Pectoralis Minor
  3. Subclavius
  4. Serratus Anterior
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2
Q

Which muscles form anterior wall of axilla?

A

Pectoralis major and minor

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3
Q

Pectoralis major and minor form anatomy of?

A

Breast

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4
Q

Which nerve innervate pectoralis major and minor?

A

Major
Median and lateral pectoral nerves (branches of brachial plexus)

Minor
Only median

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5
Q

What structures does the pectorals are in close relation with?

A

1.The brachial plexus
2.Subclavian artery
3.Subclavian vein
(All run between the muscle and ribcage)

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6
Q

What is action of pectoralis major?

A

Adduction and medial rotation of arm

Clavicular fibres - flex the arm

Lifts the trunk when inhaling

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7
Q

Which muscle is known as breast stroke muscle?

A

Pectoralis major

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8
Q

Which muscle causes retroversion (outward rotation) of upper arm?

A

Pectoralis major

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9
Q

What are the functions of pectoralis minor?

A

Elevates the ribs (3rd - 5th) when fixed scapula

Depression of point of shoulder

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10
Q

Location of pectoralis minor?

A

Under pectoralis major

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11
Q

How many parts of pectoralis major? What are their function? Opposite and together?

A

2 heads:
1.Clavicular head (flexes humerus)
2. Sternocostal head(extension of humerus back to anatomical position)

Work opposite to each other
But when work together perform:

  1. Adduction of humerus
  2. Medial or internal rotation of humerus
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12
Q

What is the origin of and insertion of pectoralis major?

A

origin
Clavicle
Sternum + upper 6 costocartilage

Insertion
Lateral lip of bicipital groove of humerus (intertubercular groove)

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13
Q

Pectoralis major gets its blood supply from which artery?

A

Thoracoacromial artery

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14
Q

Medial and lateral pectoral nerves are branches of?

A

Brachial plexus

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15
Q

Thoracoacromial artery is a branch of?

A

Axillary artery

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16
Q

Pectoralis minor is inserted into?

A

Coracoid process of scapula

17
Q

Difference of nerve supply of pectoralis major and minor?

A

Major:
Median + lateral nerve of brachial plexus

Minor:
Only median

18
Q

The origin and insertion of pectoralis minor?

A

Origin
3rd, 4th and 5th ribs

Insertion
Corocoid process of scapula

19
Q

Origin of subclavius?
And insertion?

A

Origin

1st rib (costal cartilage)

Insertion
Clavicle

20
Q

What passes under the subclavius?

A
  1. Brachial plexus
  2. Subclavius Artery
  3. Subclavius vein
21
Q

What is subclavius muscle innervated by?

A

Nerve to subclavius (from the upper trunk of brachial plexus)

22
Q

Location of subclavius muscle?

A

Underneath the pectoralis major

23
Q

Subclavian nerve originates from which part of brachial plexus?

A

Upper trunk

24
Q

Artery which supply subclavius?

A

Two:
1. Thoracoacromial artery (branch of axillary artery)

  1. Suprascapular artery
    (Branch of subclavian artery)
25
Q

Function of subclavius?

A
  1. Depresses clavicle and stabilizes it
  2. Elevation of 1st rib
26
Q

Origin and insertion of serratus anterior?

A

origin
Upper 8 ribs

Insertion
Medial border and inferior angle of scapula

27
Q

Serratus anterior is innervated by?

A

Long Thoracic nerve ( branch of brachial plexus)

28
Q

Function of serratus anterior?

A

Rotataion of scapula

29
Q

Location of serratus anterior?

A

Lateral aspect of thoracic wall

Major portion lies under scapula and pectoral muscles

30
Q

Paralysis of serratus anterior causes?

A

Winged scapula- protrusion of scapula

31
Q

What is arterial supply of serratus anterior?

A
  1. Superior Thoracic Artery
  2. Lateral Thoracic Artery
  3. Thoracodorsal Artery
32
Q

The most superficial muscle in the pectoral region?

A

Pectoralis Major

33
Q

Clavicular head of pectoralis major originates from?

A

Anterior surface of medial clavicle

34
Q

Sternoclavicular head of pectoralis major originates from?

A
  1. Anterior surface of sternum.
  2. Superior 6 costal cartilages
  3. Aponeurosis of external Oblique muscle
35
Q

What part of pectoralis major flexes the arm?

A

Clavicular fibres

Anatomy Muscles (8 decks)

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