w
Muscles of the Shoulder and upper
Limb Are Concerned with Movement
You learned in Chapter 5 that the pectoral girdle consists
of the clavicle and scapula. The region of the muscles that
attach to these bones and to the bones of the arm and
forearm are also referred to as the
pectoral girdle
or
shoul-
der girdle.
The muscles of the shoulder include the deltoid,
subscapularis, supraspinatus, infraspinatus, teres major,
and teres minor.
Figure 6.20
illustrates and describes
these muscles.
M uscles o f th e sh o u ld er and u p p e r limb • Figure 6.2 0
Deltoid (cut)
Supraspinatus
Subscapularis
Pectoralis
major (cut)
Teres major
Biceps brachii
(cut)
Latissimus dorsi
Clavicle
Pectoralis
major (cut)
Pectoralis minor
Anterior deep view
Deltoid
Scapula
Teres major
Coraco-
brachialis
Humerus
5
Supraspinatus
'
(cut)
Infraspinatus
Teres minor
Teres major
Triceps brachii
Posterior view
Muscle
Origin
Insertion
Action
Muscles of the shoulder
Deltoid
(DEL-toyd)
Clavicle and scapula
Humerus
Abducts, flexes, extends, and rotates arm at shoulder joint
Subscapularis
(sub-scap'-u-LA-ris)
Scapula
Humerus
Rotates arm medially at shoulder joint
Supraspinatus
(soo'-pra-spi-NA-tus)
Scapula
Humerus
Assists deltoid muscle in abducting arm at shoulder joint
Infraspinatus
(in'-fra-spi-NA-tus)
Scapula
Humerus
Rotates arm laterally at shoulder joint
Teres major
(TE-rez)
Scapula
Humerus
Extends arm at shoulder joint; assists in adduction and
rotation of arm medially at shoulder joint
Teres minor
Scapula
Humerus
Rotates arm laterally and extends arm at shoulder joint
previous page 214 Craig Freudenrich, Gerard J  Tortora   Visualizing Anatomy and Physiology   2011 read online next page 216 Craig Freudenrich, Gerard J  Tortora   Visualizing Anatomy and Physiology   2011 read online Home Toggle text on/off