Dissection of breast and anterolateral thoracic wall

External intercostal muscles viewed from left

For permissions information regarding the use of these images, please contact Drew Bourn at dbourn@stanford.edu

Image #115-3
Bassett ImageDiagram Image
Legend Image
Dissection of breast and anterolateral thoracic wall
External intercostal muscles viewed from left
The left upper limb has been detached from the specimen.
1 . Rib I
2 . External intercostal muscle
3 . Pectoralis minor muscle (cut across near origin)
4 . Pectoralis major muscle (abdominal part, cut off near origin)
5 . External abdominal oblique muscle (cut off)
6 . Rib VIII (pointer on costochondral junction)
7 . Posterior scalene muscle
8 . Serratus anterior muscle (upper part, cut across)
9 . Trapezius muscle right
10 . Serratus anterior muscle middle part, cut across)
11 . Rib VI
12 . Serratus anterior muscle (lower part, cut across)
13 . Serratus posterior inferior muscle (cut across at insertions)
14 . Erector spinae muscle
15 . Rib XII