Coracobrachialis

[Sonia]

A small muscle in the upper arm that originates on the Coracoid process (Crazy, right?) and inserts around the upper-third of the [Humerus].
But more importantly, A muscle that you will rarely if ever see/hear mentioned when looking up exercise routines online, reading body-building forums, or when engaging in casual conversation at your local gym. Why? Because very few [meathead] Broscientists ever have enough actual scientific evidence or basic anatomical education to ever know what the Coracobrachialis muscle is, let alone spell/pronounce it.
This neglected muscle falls unfortunately under the same category as other never talked about/trained yet just as important muscles such as [Anterior] Tibialis, Levator Scapulae, [Teres] Major (or Upper [Lat], as many non-educated Broscientists will tell you, despite it being an entirely different muscle than the Latissimus Dorsi) and Anconeus. (Thats right, your arm IS made up of more than just the [Bis] [N] [Tris].

[Ernesto]

a muscle attached to the shoulder blade (= the triangular bone on each side of the back)