- origin:
lateral head: superior 1/2 of post. lat. surface of humerus;
long head: infraglenoid tuberosity of scapula;
medial head:
- inferior 2/3 on posterior surface of the humerus, beginning at the spiral groove;
- medial head surrounds the radial nerve in the spiral groove;
- insertion: supraposterior surface of the olecranon process of the ulna
and deep fascia of the forearm;
- action: extends forearm at the elbow. Longe head aids in adduction and
extension of the arm at the shoulder;
- nerve supply:
Radial ,
C7 >
C6 ,
C8 ,
T1
- synergist:
Anconeus ;
- helps form
triangular space &
quadrangular space:
- Injury of Triceps:
- weakness or paralysis of the triceps is usually considered of little importance, since gravity will extend the elbow passively in most
positions that the arm assumes;
- however, use of the triceps is important for walking with crutches;
- consider transfer of
Brachioradialis muscle from lateral aspect of the elbow and forearm to a position posterior to lateral humeral condyle;
- should power of the
Brachialis muscle be insufficient, added power is obtained by transferring the
ECRL
A Cadaveric Study of Ulnar Nerve Innervation of the Medial Head of Triceps Brachii
