Posteromedial view, right side
(photo credit - Paula Stacey, Fall
2008)
Posteromedial view, right side
(photo credit - Paula Stacey, Fall
2008)
Posterior view, left side
Posterior (superficial) view of origin, right
Posterior view of insertion, right sideHuman information:
triceps brachii, long head
origin: infraglenoid tubercle of
scapula
insertion: olecranon process of
ulna
nerve: radial (C7-C8)
action: extension of
forearm, extend
and adduct arm
The triceps brachii is one of the five muscles of the forearm that we will study. The anconeus and the triceps brachii have the same action, so Dr. J suggests that you learn these as a group. You should note the perimysium (pearlescent pantyhose) on the long head of the triceps brachii. Functionally this is important as it strengthens the muscle cells and keeps them from tearing. It is found on all skeletal muscles, but is particularly noticeable in a few muscles such as this one. The above drawings of the origin and insertion might help visualize this information (red is the origin, blue the insertion).
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2009 by William C. Johnson II
ALL RIGHTS RESERVED!
