Pectoral region and axilla

Right pectoralis major and deltoid muscles, anterior view

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Image #89-2
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Pectoral region and axilla
Right pectoralis major and deltoid muscles, anterior view
The deep fascia has been removed. A well-developed sternalis muscle (9) is present. Later dissection revealed that this variant was not bilateral.
1 . Acromion
2 . Deltoid muscle
3 . Biceps brachii muscle (upper pointer, short head; lower pointer, long head)
4 . Serratus anterior muscle
5 . Clavicle
6 . Sternocleidomastoid muscle
7 . Clavicular part pectoralis major muscle
8 . Sternocostal part pectoralis major muscle
9 . Sternalis muscle
10 . Sternum