You need to get 100% to score the 11 points available. Practice. Actions. The upper limb is attached to the back of the trunk by five muscles, the trapezius and the latissimus dorsi, which are attached to the scapula and to the humerus, and cover nearly all the back from the occiput to the ilium. An example of an anterior abdominal muscle is your rectus abdominis, commonly referred to as the six-pack, which is worked with exercises like crunches. Location of the latissimus dorsi muscle: Highlighted in orange, the latissimus dorsi is a muscle of the posterior torso. One of us! Add to Cart | View Cart ⇗ | Info. They are divided into three layers. Attachments: A broad origin up the length of the spine, with each origin attaching several vertebrae higher. Similarly, all muscles that cross the spinal joints posteriorly are extensors of the trunk at the spinal joints and anterior tilters of the pelvis at the lumbosacral joint. Actions: Supports and depresses the scapula. Location of the multifidus muscle: Highlighted in orange, the multifidus muscle is a muscle of the posterior trunk and lies interior to a majority of muscles, CC LICENSED CONTENT, SPECIFIC ATTRIBUTION. Actions: Extends, adducts, and medially rotates the upper arm. To play this quiz, please finish editing it. The intercostal muscles form the chest wall and function in respiration. Attachments: The trapezius originates from the skull and spine of the upper back and neck. Attaches to the lower ribs and forms an aponeurosis toward the midline and linea alba. Toward the midline, the muscles form aponeuroses, which merge into the linea alba. All intercostal muscles originate on the lower border of a rib and attach to the upper border of the rib below. Outline the posterior muscles of the torso. While this guide focuses on anterior trunk Save. Key Points. Diaphragm: The diaphragm is a large, flat, sheet-like muscle that extends horizontally underneath the rib cage. Today's Rank--0. Delete Quiz. Actions: Retracts and rotates the scapula. The rectus abdominis are the muscles often referred to as the “six-pack abs” and are involved in numerous aspects of trunk stabilization and bending. 11th - University grade . The vertical muscles aid in compressing the abdominal cavity, stabilizing the pelvis, and depressing the ribs when a person is walking. Deep Posterior Muscles. 71% average accuracy. The subclavian nerve originates in both C5 and C6 and innervates the subclavius, a muscle that involves lifting the first ribs during respiration. Total Points. Actions: Extends and controls abduction and adduction of the spine and neck. For more information contact us at info@libretexts.org or check out our status page at https://status.libretexts.org. Intercostal muscles of the anterior trunk: Deep muscles of the chest and front of the arm, with the boundaries of the axilla. The superficial posterior muscles are associated with movement of the shoulder. The muscle converges into a tendon attaching to the humerus. Rhomboids. latissiumus dorsi action. Muscles of the Trunk. For instance, the pecs are the pectoralis major muscles at each breast. normalized muscle tone and reduced active muscle requirements. Attachments: The muscle is formed of several strips originating from the second to eighth ribs, each of which attaches to the scapula. : The splenius capitis is highlighted in orange, with the splenius cervicis directly below. Biology. Watch the recordings here on Youtube! Unless otherwise noted, LibreTexts content is licensed by CC BY-NC-SA 3.0. The superficial muscles of the back are responsible for movement of the shoulder. Actions: Rotates and extends the head and neck. Muscles of the posterior portion of the trunk include muscles of the back, suboccipital region, and perineum region. posterior muscles of the trunk Trunk muscles have a few very important functions; they contribute to the protection of the thoracic and abdominopelvic viscera and they assist essential body activities such as breathing , movement , defecation and micturition. Actions: Maintains posture through the spine. Two muscles in the superficial layer are responsible for rotation of the head. Both attach to the humerus. Location of the external obliques: Highlighted in orange, the external obliques lie inferior to the pectoral muscles. The long thoracic nerve arises from C5, C6, and C7. Posterior View of the Muscles of the Trunk. Pectoral muscles lie in the chest and exert force through the shoulder to move the upper arm. The objective of this report was to study the influence of the orientation of gravitational loading on the behavior of anterior and posterior trunk muscles during anterior trunk flexion-extension. We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. The posterior or back muscles perform a wide range of functions, including movement of the shoulder, head, and neck and assisting in respiration, posture, and balance. Underneath the trapezius are the two rhomboid muscles, and the levator anguli scapulae. The fibers run in different directions and cross each other, strengthening the abdominal wall. Sagarin KA(1), Redgrave AC(1)(2), Mosimann C(3), Burke AC(1), Devoto SH(1). Department of Biology, Wesleyan University, Middletown, Connecticut. Posterior muscles are split into three groups depending on their physiological location. It's … Attachments: Originates from the lower spine and attaches to ribs 2 through 5. Attachments: Originates from the side of the spine in the neck and attaches to the scapula. Attachments: Originates from the common tendon and attaches to the lower ribs, spine, and skull. Posterior Trunk Muscles, Posterior , Trunk , Muscles, Infraspinatus, Splenius Capitus, Latissimus Dorsi, Rhomboid Minor, Rhomboid, Minor, Illiocostalis, Gluteus Medius, Longissimus, Trapezius, Levator Scapulae, Deltoid, Rhomboid Major, Internal Abdominal Oblique, Internal, Abdominal, Oblique, External Abdominal Oblique, Supraspinatus, Supraspinatus, Teres Major, Teres, Major Actions: Retracts and rotates the scapula. The back is characterized by numerous muscle groups which allow movement of the shoulder, head, and neck, as well as aid in respiration and maintain posture and balance. Actions: Extends and rotates the head and maintains posture. Actions: Extends and rotates the head and maintains posture. The diaphragm is a sheet-like muscle that extends underneath the rib cage and aids in respiration by physically moving the lungs. Enter the correct letter in rhe answer blank. Advertisement . Finish Editing. Anna C. Redgrave. Attachments: Originates from the pelvis and thoracolumbar fascia, running through the back. Lying below the pectoral muscles, the intercostal muscles form the chest wall and play a key role in respiration. Attachments: Originates from the common tendon and attaches to the upper spine and skull. Share practice link. Today 's Points. Muscles of the posterior portion of the trunk include muscles of the back, suboccipital region, and perineum region. The obliques are abdominal muscles that assist during bending and twisting of the torso. Choose from 500 different sets of posterior trunk muscles flashcards on Quizlet. Game Points. Location of the multifidus muscle: Highlighted in orange, the multifidus muscle is a muscle of the posterior trunk and lies interior to a majority of muscles, CC licensed content, Specific attribution, http://en.wikipedia.org/wiki/Innermost_intercostal_muscle, http://en.wiktionary.org/wiki/pelvic_floor, http://en.wikipedia.org/wiki/Pyramidalis_muscle, http://en.wikipedia.org/wiki/Transversus_abdominis_muscle, http://en.wikipedia.org/wiki/Levatores_costarum_muscle, http://en.wikipedia.org/wiki/External_intercostal_muscles, http://en.wikipedia.org/wiki/Transversus_thoracis_muscle, http://en.wikipedia.org/wiki/Abdominal_internal_oblique_muscle, http://en.wikipedia.org/wiki/Intercostal_muscle, http://en.wikipedia.org/wiki/Subcostales_muscle, http://en.wikipedia.org/wiki/Abdominal_external_oblique_muscle, http://en.wikipedia.org/wiki/Internal_intercostal_muscles, http://en.wikipedia.org/wiki/Thoracic_diaphragm, http://en.wikipedia.org/wiki/Iliococcygeus_muscle, http://en.wikipedia.org/wiki/Puborectalis_muscle, http://en.wikipedia.org/wiki/Coccygeus_muscle, http://en.wikipedia.org/wiki/Rectus_abdominis_muscle, http://en.wikipedia.org/wiki/Quadratus_lumborum_muscle, http://en.wikipedia.org/wiki/Pelvic_diaphragm, http://en.wikipedia.org/wiki/Cremaster_muscle, http://en.wikipedia.org/wiki/Pubococcygeus_muscle, http://en.wikipedia.org/wiki/rectus%20abdominis, http://en.wikipedia.org/wiki/levatores%20costarum, http://en.wikipedia.org/wiki/File:Gray392.png, http://en.wikipedia.org/wiki/File:Gray411.png, http://en.wikipedia.org/wiki/Superficial_perineal_pouch, http://en.wikipedia.org/wiki/Rectus_capitis_posterior_minor_muscle, http://en.wikipedia.org/wiki/Transversus_perinei_superficialis_muscle, http://en.wikipedia.org/wiki/Serratus_posterior_inferior_muscle, http://en.wikipedia.org/wiki/Splenius_cervicis_muscle, http://en.wikipedia.org/wiki/Splenius_capitis_muscle, http://en.wikipedia.org/wiki/Erector_spinae, http://en.wikipedia.org/wiki/Iliocostalis, http://en.wikipedia.org/wiki/Serratus_posterior_superior_muscle, http://en.wikipedia.org/wiki/Transversospinales_muscles, http://en.wikipedia.org/wiki/Sphincter_ani_internus_muscle, http://en.wikipedia.org/wiki/Transversus_perinei_profundus_muscle, http://en.wikipedia.org/wiki/Semispinalis_dorsi, http://en.wikipedia.org/wiki/Rectus_capitis_posterior_major_muscle, http://en.wikipedia.org/wiki/Rotatores_muscle, http://en.wikipedia.org/wiki/Deep_perineal_pouch, http://en.wikipedia.org/wiki/Semispinalis_capitis, http://en.wikipedia.org/wiki/Multifidus_muscle, http://en.wikipedia.org/wiki/Latissimus_dorsi_muscle, http://en.wikipedia.org/wiki/Bulbospongiosus_muscle, http://en.wikipedia.org/wiki/Obliquus_capitis_superior_muscle, http://en.wikipedia.org/wiki/Intertransversarii_muscle, http://en.wikipedia.org/wiki/Obliquus_capitis_inferior_muscle, http://en.wikipedia.org/wiki/Sphincter_urethrae, http://en.wikipedia.org/wiki/Sphincter_ani_externus_muscle, http://en.wikipedia.org/wiki/Semispinalis_cervicis, http://en.wikipedia.org/wiki/Ischiocavernosus_muscle, http://en.wikipedia.org/wiki/Interspinales_muscle, http://en.wikipedia.org/wiki/compressor%20urethrae, http://www.boundless.com//physiology/definition/internal-urethral-sphincter, http://en.wikipedia.org/wiki/File:Multifidi.png, http://en.wikipedia.org/wiki/File:Musculus_splenius_capitis_marked.png, http://en.wikipedia.org/wiki/File:Latissimus_dorsi_.PNG. MUSCLES (ANTERIOR THORAX AND TRUNK; 5-Posterior Trunk Muscles; Katie's Trunk by Ann Turner; Lower extremity; Facial Muscles; Bones & Muscles Vocabulary; Create Flashcards; Flashcards; Home › Create › Flashcards › Health › Body › Muscles › Muscles of the Trunk . The posterior chain refers to the muscles located in the posterior, or backside, of the body. Attachments: Originates from the spine and attaches several vertebrae higher. The muscles of the trunk counteract the forces on the limbs, and adjust the line of gravity over the foot base. The intermediate muscles of the posterior contribute to movements of the ribcage during respiration. Select a different color for each muscle description with a coding circle and color the ccxling circles and corresponding muscles on Figure 6—8. Long-term outcomes in the treatment of defects of the spine and bony thorax have been proved superior if flaps were used. Trapezius. 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The head and neck and are fundamental in maintaining posture and balance instance., C6, and controls abduction and adduction of the latissimus dorsi is a broad lying... Key role in just about any movement you make third to fifth ribs and attaches ribs.

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