Download Table 10.5: Deep Muscles of the Thorax: Breathing • Two phases of

3/28/2017
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Table 10.5: Deep Muscles of the Thorax: Breathing
• Two phases of breathing: inspiration (inhaling) and expiration (exhaling)
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Table 10.5: Deep Muscles of the Thorax: Breathing
• Inspiratory muscles include diaphragm and external intercostals
– Contraction of these muscles enlarges rib cage
– Diaphragm divides thoracic and abdominal cavities
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Table 10.5: Deep Muscles of the Thorax: Breathing
• Expiration brought on by relaxation of inspiratory muscles, as well as contraction of
internal intercostals
– Relaxation of muscles decreases size of rib cage
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Table 10.5 Deep Muscles of the Thorax: Breathing
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Figure 10.11a Muscles of respiration.
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Figure 10.11c Muscles of respiration.
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Table 10.6: Muscles of the Abdominal Wall: Trunk Movements and Compression
of Abdominal Viscera
• Four paired muscles: their fasciae and aponeuroses form lateral and anterior
abdominal wall
– Rectus abdominis
– External obliques
– Internal obliques
– Transversus abdominis
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Table 10.6: Muscles of the Abdominal Wall: Trunk Movements and Compression
of Abdominal Viscera (cont.)
• Fascicles run at angles to one another, provide added strength
• Actions of these muscles
– Lateral flexion and rotation of trunk
– Help promote urination, defecation, childbirth, vomiting, coughing, and screaming
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Table 10.6 Muscles of the Abdominal Wall: Trunk Movements and Compression of
Abdominal Viscera
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Figure 10.12a Muscles of the abdominal wall.
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Figure 10.12b Muscles of the abdominal wall.
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Figure 10.12c Muscles of the abdominal wall.
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Table 10.8: Superficial Muscles of the Anterior and Posterior Thorax: Movements
of the Scapula and Arm
• Most are extrinsic shoulder muscles
– Act in combination to fix shoulder girdle (mostly scapula); move it to increase
range of arm movements
– Actions: elevation, depression, rotation, lateral and medial movements, protraction,
and retraction
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Figure 10.12b Muscles of the abdominal wall.
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Figure 10.12c Muscles of the abdominal wall.
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Table 10.8: Superficial Muscles of the Anterior and Posterior Thorax: Movements
of the Scapula and Arm
3/28/2017
• Most are extrinsic shoulder muscles
– Act in combination to fix shoulder girdle (mostly scapula); move it to increase
range of arm movements
– Actions: elevation, depression, rotation, lateral and medial movements, protraction,
and retraction
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–
•
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Table 10.8: Superficial Muscles of the Anterior and Posterior Thorax: Movements
of the Scapula and Arm
• Two groups of muscles
– Muscles of the anterior thorax
– Muscles of the posterior thorax
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–
•
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Table 10.8-1 Superficial Muscles of the Anterior and Posterior Thorax: Movements
of the Scapula and Arm
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Figure 10.14a Superficial muscles of the thorax and shoulder acting on the
scapula and arm.
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Figure 10.14b Superficial muscles of the thorax and shoulder acting on the
scapula and arm.
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Table 10.8-2 Superficial Muscles of the Anterior and Posterior Thorax: Movements
of the Scapula and Arm (continued)
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Figure 10.14c Superficial muscles of the thorax and shoulder acting on the scapula
and arm.
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Figure 10.14d Superficial muscles of the thorax and shoulder acting on the
scapula and arm.
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Figure 10.14e Superficial muscles of the thorax and shoulder acting on the
scapula and arm.
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