Anterior:middle 1/3rd of shaft of humerus Posterior:fibres of long and lateral heads of triceps brachii Above:origin of lateral head of triceps brachii Below:origin of medial head of triceps brachii Structures that pass via/along this groove are ΕΓΔΓΓΔΉ ΓΓΕVΓ PΕΓFΓΓΔΓ BΕΓΓHΓΓ ΓΕΕ€ΓΕΓ