313
CHAPTER NINE
Muscular System
Levator scapulae
Levator scapulae
Supraspinatus
Spine of scapula
Deltoid
Infraspinatus
Teres minor
Teres major
Long head of
triceps brachii
Lateral head of
triceps brachii
(a)
(d)
(c)
(b)
Supraspinatus
Triceps
brachii
Infraspinatus
Teres minor
Teres major
FIGURE 9.29
Muscles of the shoulder and arm. (
a
) Muscles of the posterior surface of the scapula
and the arm. (
b
and
c
) Muscles associated with the scapula. (
d
) Isolated view of the triceps brachii.
TABLE
9.6
|
Muscles That Move the Pectoral Girdle
Muscle
Origin
Insertion
Action
Nerve Supply
Trapezius
Occipital bone and spines of
cervical and thoracic vertebrae
Clavicle, spine, and
acromion process of scapula
Rotates scapula; various F
bers raise scapula, pull scapula
medially, or pull scapula and shoulder downward
Accessory n.
Rhomboid major
Spines of upper thoracic
vertebrae
Medial border of scapula
Retracts, elevates, and rotates scapula
Dorsal scapular n.
Rhomboid minor
Spines of lower cervical
vertebrae
Medial border of scapula
Retracts and elevates scapula
Dorsal scapular n.
Levator scapulae
Transverse processes of
cervical vertebrae
Medial margin of scapula
Elevates scapula
Dorsal scapular and
cervical nerves
Serratus anterior
Outer surfaces of upper ribs
Ventral surface of scapula
Pulls scapula anteriorly and downward
Long thoracic n.
Pectoralis minor
Sternal ends of upper ribs
Coracoid process of scapula
Pulls scapula forward and downward or raises ribs
Pectoral n.
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