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Anatomy and Physiology I Muscles that Move the Vertebral Skeleton Muscles that Aid in Breathing Muscles of the Abdominal Wall Muscles that Move the Scapula.

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Presentation on theme: "Anatomy and Physiology I Muscles that Move the Vertebral Skeleton Muscles that Aid in Breathing Muscles of the Abdominal Wall Muscles that Move the Scapula."— Presentation transcript:

1 Anatomy and Physiology I Muscles that Move the Vertebral Skeleton Muscles that Aid in Breathing Muscles of the Abdominal Wall Muscles that Move the Scapula Instructor: Mary Holman

2 Muscles that move the Vertebral Column Erector spinae : Iliocostalis group - lateral Longissimus group - intermediate Spinalis group - medial

3 Fig Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Action: Acting together, muscles of each region extend and main- tain erect posture of vertebral column in their respective region. Acting singly, laterally flex vertebral column in their region. Iliocostalis (lateral) group Iliocostalis cervicis Iliocostalis thoracis Iliocostalis lumborum

4 Fig Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Cervicis - Origin: upper 6 ribs Insertion: cervical vertebrae 4-6 Action: extends neck Thoracis - Origin: lower 6 ribs Insertion: upper 6 ribs Action: holds spine erect, extends, laterally flexes & rotates Lumborum - Origin: Iliac crest & lumbar vert. Insertion: lower 6 ribs Action: Extends, laterally flexes & rotates spine Iliocostalis lumborum Iliocostalis thoracis Iliocostalis cervicis Iliocostalis Group of Erector Spinae

5 Fig Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Action: Acting together, both L. capitis muscles extend the head. Acting singly, they rotate the head to the same side as the contracting muscle. Acting together, L. cervicis & L. thoracis extend the vertebral column in their regions. Acting singly, they laterally flex the vertebral column in their region. Longissimus (intermediate) Group Longissimus capitis Longissimus cervicis Longissimus thoracis

6 Fig Capitis - Origin: upper thoracic, lower cervical vertebrae Insertion: Mastoid process Action: extends & rotates head Cervicis - Origin: 4th and 5th thoracic vertebrae Insertion: 2nd - 6th cervical vertebrae Action: holds spine erect, extends, laterally flexes & rotates Thoracis- Origin: lumbar vertebrae Insertion: Thor. and upper lumbar vertebrae & ribs 9 & 10 Action: Extends thoracic region of spine Longissimus capitis Longissimus cervicis Longissimus thoracis Longissimus Group of Erector spinae

7 Fig Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Action: Acting together, muscles of each region extend the vertebral column of their respective regions. Spinalis (medial) Group Spinalis capitis Spinalis cervicis Spinalis thoracis

8 Fig Capitis - Origin: upper thoracic, lower cervical vertebrae Insertion: Occipital bone Action: extends & rotates head Cervicis - Origin: ligmentum nuchae & 7th cervical vertebra Insertion: axis Action: holds spine erect, extends, laterally flexes & rotates Thoracis- Origin: upper lumbar and lower thoracic vertebrae Insertion: Upper thoracic vertebrae Action: Extends thoracic region of spine Spinalis thoracis Spinalis cervicis Spinalis capitis Spinalis Group of Erector spinae

9 Erector spinae : Iliocostalis group Longissimus groupSpinalis group APRevealed

10 Fig Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Origin: Iliac crest Insertion: Upper lumbar vertebrae & 12th rib Action: Aids in breathing, Extends lumbar region Quadratus lumborum

11 Muscles Used in Breathing Diaphragm External Intercostals Internal Intercostals Quadratus lumborum

12 Diaphragm Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Plate 7, pg 45 Origin : Xiphoid process, costal cartilages of inferior 6 ribs, and lumbar vertebrae Insertion : Central tendon

13 External intercostal m. Internal intercostal m. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Plate 7, pg 45 Origin: Inferior border of rib above Insertion: Superior border of rib below Origin: Superior border of rib below Insertion: Inferior border of rib above Intercostals

14 Fig Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Origin: Iliac crest Insertion: Upper lumbar vertebrae & 12th rib Action: Aids in breathing, extends lumbar region Quadratus lumborum

15 Quadratus lumborum Anterior view Plate 7 pg. 45

16 Muscles of the Abdominal Wall Rectus abdominis External oblique Internal oblique Transversus abdominis

17 Fig. 9.35a Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Origin: Crest of pubis and symphysis pubis Insertion: Xiphoid process of sternum and costal cartilages of 5th to 7th ribs Action: Tenses abdominal wall, compresses abdominal con- tents and flexes vertebral column. Rectus abdominis Tendinous intersections

18 External oblique Origin: Outer surfaces of lower 8 ribs Insertion: Iliac crest and linea alba Action: Tenses abdominal wall and compresses abdominal contents a & b

19 Fig. 9.35a & c Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Internal oblique Origin: Crest of ilium and inguinal ligament Insertion: Cartilages of lower ribs, linea alba and, crest of pubis Action: Tenses abdominal wall and compresses abdominal contents

20 Fig. 9.35d Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Transversus abdominis Origin: Costal cartilages of lower ribs, processes of lumbar vertebrae, & lip of iliac crest. Insertion: Linea alba and crest of pubis. Action: Tenses abdominal wall and compresses abdominal contents

21 Rectus abdominus External Oblique Internal Oblique Transversus abdominus Plate Two Pg 40

22 Fig. 9.35e Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Internal oblique Peritoneum Skin Linea alba Rectus abdominis Transversus abdominis External oblique Transverse Section through Abdominal Wall

23 Page 347 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. © Royalty-Free/CORBIS

24 Muscles that Move the Pectoral Girdle

25 Anterior Thoracic Muscles Pectoralis minor Serratus anterior Posterior Thoracic Muscles Trapezius Levator scapulae Rhomboideus major Rhomboideus minor

26 Fig Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Pectoralis minor Origin: Three upper ribs (can vary) Insertion: Coracoid process of scapula Action: Depresses and abducts scapula forward, rotates it downward or raises ribs

27 Fig Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Serratus anterior Origin: Superior 8 or 9 ribs Insertion: Ventral surface of scapula Action: Pulls scapula anteriorly and downward

28 Fig. 9.27b Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Trapezius Fig Origin: Occipital bone & spines of 7th cervical and all thoracic vertebrae Insertion: Clavicle, spine and acromion process of scapula Action: Rotates scapula can raise, pull medially, pull upward or depress scapula Anterior Posterior

29 Plate 57 pg 349 Deltoid m. Trapezius m. Infraspinatus m. Border of scapula Latissimus dorsi m. Erector spinae m. Triceps brachii m. Biceps brachii m. Teres major m. Vertebral spine © Dr. Kent M. Van De Graaff

30 Fig. 9.29a Levator scapulae Spine of scapula Origin: Transverse processes of superior 4 or 5 cervical vertebrae Insertion: Medial border of scapula Action: Elevates scapula and rotates it downward

31 Fig. 9.27a Fig. 9.27d Rhomboideus major Origin: Spines of upper thoracic vertebrae Insertion: Medial margin of scapula Action: Adducts, elevates and rotates scapula downward

32 Fig. 9.27a Fig. 9.27d Rhomboideus minor Origin: Spines of lower cervical vertebrae Insertion: Medial margin of scapula Action: Adducts, and elevates scapula


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