The Muscular System Upper Limb
Biceps two headed muscle. One head goes to superglenoid tubercule, and on it’s
passage goes through the bicipital groove. The other head, called the short head,
attaches to the coracoid process. Two bellies come together to form one belly that
inserts on bicipital tuberosity. Elbow, and shoulder flexor.
Brachialis originates half way up on the humerus to insert on the ulnar tuberosity.
In terms of elbow flexion, the ulna doesn’t move a lot. The radius however, moves
a great deal (flat head that articulates with capitulum).
Coracobrachialis originates off coracoid process and originates off of shaft of
humerus. Shoulder flexor. Doesn’t influence elbow movement.
All muscles in anterior brachium are innvervated by the musculocutaneous nerve.
Tricpes long head originates infraglenoid tubercle, just below glenoid fossa. The
two other originate on humerus, not crossing shoulder joint, lateral and medial.
Common insertion on the Olecranon process of ulna. The long head allows for
Radial nerve innvervates all the posterior brachium muscles.
** Ulnar nerve, radial nerve, and median nerve. Extend down to forearm and
innervate fingers, etc.
Anterior muscles perform flexion of digits and flexion of elbow as well as
Adduction & abduction of wrist is also called deviation (ulnar & radial). Posterior
muscles extend wrist & hand & digit. Very weak extensors of the elbow. Also perform
add &abduction of wrist.
Anterior muscles all originate on the medial epicondyle of humerus.
Pronator teres Must attach to radius. Performs pronation and elbow flexion.
Flexor Carpi Radialis runs alongside radial side of forearm. Inserts on second and
third metacarpal. Performs flexion and abduction (radial deviation) of wrist.
Palmaris longus inserts on palmar fascia. Weak flexor of wrist
Flexor Carpi Ulnaris encloses the pisiform. Flexes and adducts the wrist (ulnar
All innvervated by Median nerve (EXCEPT FOR ULARNIS which is innervated
by ulnar nerve).
Not muscles of anterior compartment: originate off of lateral epicondyle. Extensor
muscles, posterior compartment muscles. Wrist and elbow flexion. Movement of
Extensor Carpi Radialis Longus
Supinator Originates on both the ulna and radius. Origin doesn’t influence
Flexor Digitorum Superficialis flexes digits. Only muscle in midlayer. Tendon
that extends down to middle phalanx that splits. Splits around a deeper tendon that
carries on to the rest of the finger. This tendon is the tendon of the flexor
digitorum superficialis. This muscle has a large origin. Attaches to both medial