Pectoralis major muscle
| Latin | Musculus pectoralis major |
| Gray's | subject #122 436 |
| Origin | Clavicular head: anterior surface of the medial half of the clavicle. Sternocostal head: anterior surface of the sternum, the superior six costal cartilages, and the aponeurosis of the external oblique muscle |
| Insertion | Lateral lip of the bicipital groove of the humerus |
| Artery | pectoral branch of the thoracoacromial trunk |
| Nerve | lateral pectoral nerve and medial pectoral nerve Clavicular head: C5 and C6 Sternocostal head: C7, C8 and T1 |
| Actions | Clavicular head: flexes the humerus Sternocostal head: extends the humerus As a whole, adducts and medially rotates the humerus. It also draws the scapula anteriorly and inferiorly. |
| MeSH | Pectoralis+Muscles |
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Pectoralis minor muscle
| Latin | musculus pectoralis minor |
| Gray's | subject #122 438 |
| Origin | third to fifth ribs, near their costal cartilages |
| Insertion | medial border and superior surface of the coracoid process of the scapula |
| Artery | pectoral branch of the thoracoacromial trunk |
| Nerve | medial pectoral nerve (C8, T1) |
| Actions | stabilizes the scapula by drawing it inferiorly and anteriorly against the thoracic wall |
Serratus anterior muscle
| Latin | musculus serratus anterior, serratus lateralis |
| Gray's | subject #122 438 |
| Origin | fleshy slips from the outer surface of upper 8 or 9 ribs |
| Insertion | costal aspect of medial margin of the scapula |
| Artery | lateral thoracic artery (upper part), thoracodorsal artery (lower part) |
| Nerve | long thoracic nerve (from roots of brachial plexus C5, 6, 7) |
| Actions | protracts and stabilizes scapula, assists in upward rotation. |
| Antagonist | Rhomboid major, Rhomboid minor, Trapezius |
Subclavius muscle
| Latin | musculus subclavius |
| Gray's | subject #122 438 |
| Origin | first rib |
| Insertion | subclavian groove of clavicle |
| Artery | thoracoacromial trunk, clavicular branch |
| Nerve | nerve to subclavius |
| Actions | depression of clavicle |
Platysma muscle
The platysma is a superficial
muscle that
overlaps the sternocleidomastoid.
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subcutaneous tissue of infraclavicular and supraclavicular
regions
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base of mandible; skin of cheek and lower lip; angle of
mouth; orbicularis oris
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branches of the Submental
artery and Suprascapular artery
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cervical branch of the facial
nerve (CN VII)
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Draws the corners of the mouth inferiorly
and widens it (as in expressions of sadness and fright). Also draws the skin of the neck superiorly when teeth are clenched
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