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MD1S1: Anatomy 201 > Pectoral Girdle > Flashcards

Pectoral Girdle Flashcards

1
Q

Muscles of the pectoral girdle

A

Pectoral girdle = anterior axio-appendicular group
Pectoralis Major
Pectoralis Minor
Subclavius
Serratus Anterior

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2
Q

Origin of pectoralis major

A

Two heads of pectoralis major:
Clavicular head: Medial half of anterior surface of clavicle
Sternocostal head: Anterior surface of sternum up to 6th costal cartilage

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3
Q

Insertion of pectoralis major

A

Lateral lip of intertubercular sulcus

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4
Q

Nerve supply of pectoralis major

A

Medial & lateral pectoral nerves

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5
Q

Action of pectoralis major

A

Medial rotation, adduction at shoulder joint

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6
Q

Pectoralis minor

A

Lies beneath pectoralis major

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7
Q

Origin of pectoralis minor

A

3rd to 5th ribs

Not the costal cartilage

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8
Q

Insertion of pectoralis minor

A

Coracoid process of scapula

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9
Q

Nerve supply of pectoralis minor

A

Medial & lateral pectoral nerves

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10
Q

Action of pectoralis minor

A

Protracts the scapula

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11
Q

Origin of subclavius

A

First rib & its costal cartilage

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12
Q

Insertion of subclavius

A

Groove on the undersurface of middle third of clavicle

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13
Q

Nerve supply of subclavius

A

Upper trunk of brachial plexus

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14
Q

Action of subclavius

A

Steadies clavicle during movements of shoulder joint

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15
Q

Origin of serratus anterior

A

8 digitations outer surface of the first 8 ribs

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16
Q

Insertion of serratus anterior

A

All digitations pass around the chest wall & insert on the anterior surface on the medial border of the scapula

17
Q

Nerve supply of serratus anterior

A

Long thoracic nerve (Nerve of Bell)

18
Q

Action of serratus anterior

A

Protracts the scapula along the chest wall in pushing & punching movement
Abduction >90

19
Q

What causes winging of the scapula?

A

Caused by paralysis of serratus anterior muscle

MD1S1: Anatomy 201 (24 decks)

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