arises from the second, third and fourth lumbar nerves

lies above the obturator vessels on the lateral wall of the pelvis

supplies the obturator internus muscle

has no sensory branches

supplies the gracilis muscle

initiates abduction of the shoulder

has an extensive range of action because it is multipennate

is supplied by the radial nerve

inserts into a rough elevation on lateral aspect of humerus

together with the head of humerus, it is responsible for the characteristic roundness of the shoulder

begins at the upper border of the clavicle

terminates as it crosses the inferior border of pectorals minor

is contained in the axillary sheath

has the median nerve anterior to its proximal third

has the radial nerve behind its distal third

flexes both the shoulder and the elbow joints

both supinates and pronates the forearm

short head arises from clavicle

tendon of long head is partially enclosed in synovial membrane

is supplied by the median nerve

the primary curves are in the thoracic and sacral region

there is more flexion and extension in the lumbar region than in the thoracic region

there is more rotation about a longitudinal axis in the thoracic region than in the lumbar region

the transverse processes are posterior to the articular processes in all the vertebrae

the shape of the intervertebral discs contributes to the secondary curves