(this muscle occurs more frequently in lower primates and only occasionally in humans and apes)
- Origin: Humerus: medial epichondyle
- Insertion: Ulna:olecranon process
- Nerve: Ulnar
- Action: aBducts olecranon in lower animals
- CA: Humans: Approximately 1 in 4 humans will have this small muscle which is called Epitrochleoolecranonis in human anatomy books.