Humans are under certain biological constraints, which is why we can express happiness and joy only by activating musculus zygomaticus major.
In most other mammals it also innervates the musculus retractor bulbi, which can retract the eye for protection.
Within the brachial fossa, the impression of its "musculus brachialis anticus" is deeper, and extends dorsally to the base of the dorsal supracondylar process.
This includes the following muscles: palatopharyngeus, palatoglossus, musculus uvulae, the pharyngeal constrictors, salpingopharyngeus plus others.
It unveils clearly the whole area from the subedge of the subscapularis tendon until the intersection between infraspinatus tendon and musculus teres minor.
The tuberosity of the rear humerus serving as attachment for the "musculus triceps brachii" is well-developed but the vertical ridge running from it to below is not.
