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PowerPoint ® Lecture Slides prepared by Barbara Heard, Atlantic Cape Community College C H A P T E R © 2013 Pearson Education, Inc.© Annie Leibovitz/Contact Press Images 10 The Muscular System: Part B
© 2013 Pearson Education, Inc. Deep Muscles of the Thorax: Breathing Muscles of respiration External intercostals—more superficial muscles; elevate ribs for inspiration Internal intercostals—deeper muscles; aid forced expiration Diaphragm –Partition between thoracic and abdominal cavities –Most important muscle in inspiration –Innervated by phrenic nerves
© 2013 Pearson Education, Inc. Figure 10.11a Muscles of respiration. External intercostal Internal intercostal
© 2013 Pearson Education, Inc. PLAY A&P Flix™: Internal intercostals PLAY A&P Flix™: External intercostals Muscles of the Thorax
© 2013 Pearson Education, Inc. Figure 10.11b Muscles of respiration. Xiphoid process of sternum Foramen for esophagus Costal cartilage Diaphragm Lumbar vertebra Quadratus lumborum Psoas major Foramen for inferior vena cava Central tendon of diaphragm Foramen for aorta 12th rib
© 2013 Pearson Education, Inc. Figure 10.11c Muscles of respiration. Body of thoracic vertebra Aorta Diaphragm (muscular part) Inferior vena cava Esophagus Pericardial sac Central tendon of diaphragm Pericardium (cut)
© 2013 Pearson Education, Inc. Muscles of the Abdominal Wall Four paired muscles, their fasciae and aponeuroses form lateral and anterior abdominal wall –Rectus abdominis –External obliques –Internal obliques –Transversus abdominis
© 2013 Pearson Education, Inc. Figure 10.12a Muscles of the abdominal wall. Linea alba Pectoralis major Tendinous intersection Rectus abdominis Inguinal ligament (formed by free inferior border of the external oblique aponeurosis) Aponeurosis of the external oblique Transversus abdominis Internal oblique External oblique Serratus anterior
© 2013 Pearson Education, Inc. Muscles of the Abdominal Wall Fascicles run at angles to one another, provide added strength All innervated by intercostal nerves Actions of these muscles –Lateral flexion and rotation of trunk –Help promote urination, defecation, childbirth, vomiting, coughing, and screaming
© 2013 Pearson Education, Inc. Figure 10.12b Muscles of the abdominal wall. External oblique Iliac crest Rectus abdominis Internal oblique Pubic tubercle Lumbar fascia Transversus abdominis Inguinal ligament Lumbar fascia
© 2013 Pearson Education, Inc. Figure 10.12c Muscles of the abdominal wall. Linea alba Peritoneum Skin Rectus abdominis Internal oblique Transversus abdominis External oblique Aponeuroses
© 2013 Pearson Education, Inc. PLAY A&P Flix™: Internal obliques PLAY A&P Flix™: External obliques PLAY A&P Flix™: Rectus abdominis PLAY A&P Flix™: Transversus abdominis Muscles of the Abdominal Wall
© 2013 Pearson Education, Inc. PLAY A&P Flix™: Muscles that act on the shoulder joint and humerus: An overview (b) PLAY A&P Flix™: Muscles that act on the shoulder joint and humerus: An overview (a) Superficial Muscles of the Thorax Most - 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 Two groups of muscles: anterior and posterior
© 2013 Pearson Education, Inc. PLAY A&P Flix™: Muscles of the pectoral girdle (b) PLAY A&P Flix™: Muscles of the pectoral girdle (a) Superficial Muscles of the Thorax Muscles of anterior thorax –Pectoralis minor –Serratus anterior –Subclavius
© 2013 Pearson Education, Inc. PLAY A&P Flix™: Muscles that act on the shoulder joint and humerus: An overview (b) Figure 10.14a Superficial muscles of the thorax and shoulder acting on the scapula and arm. Subclavius Clavicle Subscapularis Pectoralis minor Coracobrachialis Serratus anterior Humerus Sternocleidomastoid Deltoid Pectoralis major Sternum Biceps brachii
© 2013 Pearson Education, Inc. PLAY A&P Flix™: Serratus anterior PLAY A&P Flix™: Pectoralis minor Superficial Muscles of the Thorax
© 2013 Pearson Education, Inc. PLAY A&P Flix™: Movement of the pectoral girdle PLAY A&P Flix™: Muscles of the pectoral girdle (c) Superficial Muscles of the Posterior Thorax Posterior extrinsic shoulder muscles –Trapezius –Levator scapulae –Rhomboids (major and minor)
© 2013 Pearson Education, Inc. Figure 10.14c Superficial muscles of the thorax and shoulder acting on the scapula and arm. Levator scapulae Supraspinatus Clavicle Spine of scapula Infraspinatus Teres minor Teres major Humerus Trapezius Deltoid Rhomboid minor Rhomboid major Latissimus dorsi
© 2013 Pearson Education, Inc. PLAY A&P Flix™: Levator scapula PLAY A&P Flix™: Trapezius PLAY A&P Flix™: Rhomboid major PLAY A&P Flix™: Rhomboid minor Superficial Muscles of the Posterior Thorax
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