Download Shoulder Muscles

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Shoulder Muscles
BIO 238
Instructor:
Dr. Gourdine
Shoulder (Glenohumoral Joint)
Figure 8–2a
Scapula: Posterior Surface
Figure 8–3c
Scapula: Lateral View
Figure 8–3c
Scapula: Anterior Surface
Figure 8–3a
Humerus
Figure 8–4
Clavicle
Figure 8–2b, c
Thoracic (Rib) Cage
Figure 7–22a
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ROM of the Shoulder
•
•
•
•
•
•
•
•
Flexion
Extension
Horizontal Abduction
Horizontal Adduction
Abduction
Adduction
Lateral Rotation
Medial Rotation
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Shoulder Flexion and Extension
Flexion
Extension
11
Shoulder Horizontal Abduction and
Adduction
Horizontal Abduction
Horizontal Adduction
12
Shoulder Abduction and Adduction
Abduction
Adduction
13
Shoulder Medial and Lateral
Rotation
Medial
Rotation
Lateral
Rotation
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ROM of the Scapula
•
•
•
•
•
•
Abduction (protraction)
Adduction (retraction)
Depression
Elevation
Downward rotation
Upward rotation
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Adduction and Abduction of
Scapula
Adduction
Abduction
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Depression and Elevation of
Scapula
Elevation
Depression
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Downward and Upward Rotation of
Scapula
Downward Rotation
Upward Rotation
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Muscles of the Upper Extremities:
Brachium
• Deltoid (pg 67)
▫ O-Lateral 1/3 of clavicle;
Acromion; Spine of Scapula
▫ I-Deltoid tuberosity of
humerus
▫ A- Moves the shoulder in the
following ways: Abduction,
flexion, medial rotation,
horizontal adduction,
extension, lateral rotation,
horizontal abduction
Figure 11-15a
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Muscles of the Neck and Back
• Trapezius (pg 69)
▫ O-External occipital
protuberence, medial
portion of superior nuchal
line of occiput, ligamentum
nuchae, spinous processes
C7-T12
▫ I-Lateral 1/3 of clavicle,
acromion; spine of scapula
▫ A Head and neck: Extention,
lateral flexion to the same
side, rotation to the
opposite side.
 Scapula: Elevation, upward
rotation, adduction,
stabilization, depression
Figure 11–13a
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Muscles of the Posterior Torso
Latissimus dorsi (pg 71)
• O- Inferior angle of scapula,
spinous processes of last six
thoracic vertebrae, last three
or four ribs, thoracolumbar
aponeurosis, and posterior
iliac crest
• I-Intertubercular groove of
humerus
• A-Extension, medial rotation
and adduction of shoulder
Figure 11–13a
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Muscles of the Posterior Torso
• Teres Major (pg 71)
▫ O-Inferior angle and lower
1/3 of lateral border of the
scapula
▫ I-Crest of the lesser tubercle
of the humerus
▫ A-Extension, medial
rotation and adduction of
humerus
Figure 11–15b
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Rotator Cuff
• Supraspinatus, infraspinatus, subscapularis,
teres minor muscles
Figure 11–15b
Muscles of the Posterior Torso
• Supraspinatus (pg
75)
▫ O- supraspinous fossa
▫ I-Greater tubercle of
humerus
▫ A-Abduction of
shoulder and
stabilization of head of
humerus
2311–15b
Figure
Muscles of the Posterior Torso
• Infraspinatus (pg 75)
▫ O- infraspinous fossa
▫ I-Greater tubercle of
humerus
▫ A- Lateral rotation and
adduction of shoulder,
and stabilization of
humerus
2411–15b
Figure
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Muscles of the Posterior Torso
• Teres Minor (pg 75)
▫ O-Upper axillary border of
scapula
▫ I-Greater tubercle of
humerus
▫ A-Lateral rotation and
adduction of shoulder and
stabilization of humerus
Figure 11–15b
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Muscles of the Anterior Torso
• Subscapularis (pg 75)
▫ O- Subscapular fossa
▫ I- Lesser tubercle of
humerus
▫ A-Medial rotation of the
shoulder and stabilization of
humerus
Figure 11–15a
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Muscles of the Posterior Torso
• Rhomboid(eus) major
(pg 82)
▫ O-Spinous processes T2-5
▫ I-Medial border of scapula
from root of spine to
inferior angle
▫ A-Adduction (retraction),
elevation, and downward
rotation of scapula
Figure 11–14a
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Muscles of the Posterior Torso
• Rhomboid(eus) minor
(pg 82)
▫ O-Spinous processes C7 and
T1
▫ I-Upper portion of medial
border of scapula, and
inferior angle
▫ A-Adduction (retraction),
elevation, and downward
rotation of scapula
Figure 11–14a
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Muscles of the Neck• and
Back
Levator scapulae (pg 84)
▫ O-Transverse process C1-4
▫ I-Medial border of scapula
from superior angle to
superior portion of spine of
scapula
▫ A Elevation and downward
rotation of scapula
 Lateral flexion and rotation
of head to the same side
Figure 11–13a
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Muscles of the Anterior Torso
• Serratus anterior (pg 86)
▫ O-External surface of ribs 18 or 9
▫ I-Anterior surface of
vertebral border of scapula
▫ A- Abduction (protraction),
upward rotation and
depression of scapula; hold
medial border of scapula
against rib cage.
Figure 11–13b
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Muscles of the Anterior Torso
• Pectoralis major (pg 89)
▫ O- medial half of clavicle;
Sternum, cartilages of ribs 16
▫ I-Crest of greater tubercle of
humerus
▫ A-Adduction, medial
rotation, flexion, horizontal
adduction, and extension of
shoulder
Figure 11–13b
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Muscles of the Anterior Torso
• Pectoralis minor (pg 92)
▫ O- Ribs 3-5
▫ I-Medial surface of coracoid
process of scapula
▫ A-Depression, abduction
(protraction), downward
rotation of scapula
Figure 11–13b
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Muscles of the Anterior Torso
• Subclavius (pg 94)
▫ O-Rib 1 and costal cartilage
▫ I-Inferior shaft of clavicle,
middle 1/3
▫ A-Depresses clavicle,
stabilizes sternoclaviclar
joint
Figure 11–13b
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Muscles of the Upper Extremities:
Antebrachium - Anterior
• Coracobrachialis (pg 99)
▫ O- Coracoid process of
scapula
▫ I-Medial surface of humeral
shaft
▫ A- Flexion and adduction of
shoulder
Figure 11–16b