1 Assign the following muscles to each member of the group so that each student

1 assign the following muscles to each member of the

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1. Assign the following muscles to each member of the group so that each student is in charge of that muscle group. One member will be responsible for both d & e muscles. a. Superficial extrinsic back muscles: trapezius, latissimus dorsi, rhomboid major, rhomboid minor, levator scapulae b. Intermediate extrinsic back muscles: serratus posterior superior, serratus posterior inferior c. Superficial intrinsic back muscles: splenius capitis, splenius cervicis d. Intermediate intrinsic back muscles: erector spinae (iliacostalis, longissimus, spinalis) e. Deep intrinsic back muscles: transversospinales (semispinalis, multifidus, rotatores) and segmental muscles (levatores, interspinales, intertransversarii) 2. Spend about 5 minutes on your own familiarizing yourself with the muscles, their attachments and actions of the muscle group assigned to you (see next 2 pages). 3. Have each student in the group spend approximately 1-2 minutes teaching other group members their assigned muscles starting with superficial extrinsic back muscles. 4. Next have each student rotate clockwise to a new set of the assigned muscles. 5. Spend approximately 5 minutes learning the newly assigned muscles on your own. 6. Have each student in the group spend approximately 1-2 minutes teaching the other group members the newly assigned muscles. 7. Repeat the process until each student has studied and taught each muscle group once. 72 © 2011 Shirley J. Wright, Ph.D.
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A. Superficial Extrinsic Back Muscles Trapezius Origin: superior nuchal line, external occipital protuberance, ligamentum nuchae, spinous processes C7-T12 Insertion: lateral 1/3 of clavicle, scapula (acromion & spine) Action: elevate, retract (adduct) & depress scapula Innervation: accessory nerve CN XI Latissimus dorsi Origin: spinous processes of T7 to L5, sacrum, iliac crest, ribs 10-12 Insertion: intertubercular sulcus of humerus Action: extend, adduct and medially rotate humerus Innervation: thoracodorsal nerve C6-C8 Levator scapulae Origin: transverse processes of C1 to C4 Insertion: upper portion of medial border of scapula Action: elevate scapula Innervation: C3, C4 and dorsal scapular nerve C4-C5 Rhomboid major Origin: spinous processes of T2 to T5 Insertion: medial border of scapula between spine and inferior angle Action: retract (adduct) and elevate scapula Innervation: dorsal scapular nerve C4-C5 Rhomboid minor Origin: lower portion of ligamentum nuchae, spinous processes of C7 to T1 Insertion: medial border of scapula between spine and inferior angle Action: retract (adduct) and elevate scapula Innervation: dorsal scapular nerve C4-C5 B. Intermediate Extrinsic Back Muscles Serratus posterior superior Origin: lower portion of ligamentum nuchae, spinous processes of C7 to T3, supraspinous ligaments Insertion: upper border of ribs 2 to 5 Action: elevate ribs 2 to 5 Innervation: anterior rami of T2 to T5 Serratus posterior inferior Origin: spinous processes of T12 to L3 and supraspinous ligaments Insertion: lower border of ribs 9 to 12 Action: depress ribs 9 to 12 Innervation: anterior rami of T9 to T12 73 © 2011 Shirley J. Wright, Ph.D.
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C. Superficial Intrinsic Back Muscles
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  • Spring '11
  • Masthay
  • Vertebra, Bones of the torso

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