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The infraspinatus with attachments on the sapula and humerus

Infraspinatus and Teres Minor

Integrated functional anatomy of the infraspinatus and teres minor (rotator cuff). Attachments, nerves, palpation, joint actions, arthrokinematics, fascia, triggerpoints, and behavior in postural dysfunction. Common activation exercises, subsystems, and strength exercises for the rotator cuff.

Course Summary: Infraspinatus and Teres Minor
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Course Summary: Infraspinatus and Teres Minor

Structure

This course describes the anatomy and integrated function of the infraspinatus and teres minor of the rotator cuff muscles (a.k.a. the shoulder external rotators, glenohumeral joint rotators, or SITS muscles). As the name implies, the infraspinatus originates inferior to the spine of the scapula in the infraspinous fossa of the scapula (shoulder blade), and the teres minor muscle is the smaller of two "teres muscles", the other being the "teres major ." The teres minor originates superior to the teres major on the superior 2/3rd of the lateral border of the scapula. Both the infraspinatus and teres minor cross the glenohumeral joint (shoulder joint), and both tendons insert into the greater tubercle of the humerus. The fascia covering the infraspinatus is known as the "infraspinatus fascia." Although the fascia is tacked firmly to the borders of the scapula, medially it continues to invest in the fascia superficial to the rhomboids, superiorly it invests in the fascia superficial to the supraspinatus (deep to the upper trapezius ), and laterally layers envelop the teres minor (coursing under the deltoid and separating the teres minor from the teres major ), as well as more superficial layers coursing into the deltoid fascia. Research suggests the infraspinatus and teres minor are moderately sized muscle groups, contributing to approximately 5.9% (4.8% infraspinatus and 1.1% teres minor) of the total upper body muscle mass (for comparison, the pectoralis major contributes approximately 10% of the upper body mass). Additionally, research suggests that the infraspinatus and teres minor are composed primarily of type II muscle fibers.

Function:

The infraspinatus and teres minor muscles both cross the shoulder (glenohumeral) joint and are likely the prime movers of shoulder external rotation. Additionally, both muscles aid in the stabilization of the shoulder during all joint actions as part of the rotator cuff. This course also discusses the contribution of the infraspinatus and teres minor to shoulder joint arthrokinematics, fascial integration, subsystem integration, and postural dysfunction. For example, "Arms Fall " during an Overhead Squat Assessment is correlated with altered rotator cuff recruitment and extensibility, including a reduction in EMG activity, a reduction in range of motion (ROM), and a reduction in shoulder stability, strength, and power. These changes imply these muscles most often should be activated and/or strengthened.

Practical Application:

Sports medicine professionals (personal trainers, fitness instructors, physical therapists, massage therapists, chiropractors, occupational therapists, athletic trainers, etc.) must be aware of the integrated function of the infraspinatus and teres minor for the detailed analysis of human movement, and the development of sophisticated exercise programs and therapeutic (rehabilitation) interventions. For example, altered activity and length of the infraspinatus and teres minor may contribute to rotator cuff injury, rotator cuff tears, shoulder pain, shoulder impingement syndrome (SIS), supraspinatus tendon strain, biceps tendon impingement, and the resulting weakness and pain during motions such as shoulder abduction and flexion. Altered infraspinatus and teres minor activity is also correlated with an increase in supraspinatus and subscapularis activity. These changes in shoulder function are likely to result in a significant reduction in upper extremity speed, agility, and strength, and a reduction in the effectiveness of resistance training intended to improve upper body strength and hypertrophy (bodybuilding). Deeper knowledge of infraspinatus and teres minor anatomy is essential for optimal assessment, intervention selection, and building a repertoire of infraspinatus-specific techniques.

This Course Includes:

This course also provides detailed descriptions of etymology, attachments, innervations, joint actions, location, palpation, integrated actions, arthrokinematics, fascial integration, subsystem integration, postural dysfunction, assessment, clinical implications, and interventions.

Pre-approved credits for:

Human Movement Specialist (HMS) Certification

Pre-approved for Continuing Education Credits for:

This Course Includes:

  • AI Tutor
  • Webinar
  • Study Guide
  • Text and Illustrations
  • Audio Voice-over
  • Research Review
  • Technique Videos
  • Case Study and Sample Routine
  • Practice Exam
  • Pre-approved Final Exam

Sample Intervention: Loss of Shoulder Range of Motion

Sample Self-administered Intervention

Additional Courses and Techniques:

Brookbush Institute’s most recommended techniques for the Infraspinatus and Teres Minor Muscles (see videos below):

Infraspinatus muscle on the shoulder blade
Caption: Infraspinatus muscle on the shoulder blade

Course Study Guide: Infraspinatus and Teres Minor

Course Summary Webinar: Infraspinatus and Teres Minor

Etymology of Terms Related to the Infraspinatus

Attachment and Innervations: Infraspinatus

Attachment and Innervation: Teres Minor

Where are the Infraspinatus and Teres Minor Located?

Palpating the Infraspinatus and Teres Minor

Joint Actions: Infraspinatus and Teres Minor

Arthrokinematics

Fascial Integration

Infraspinatus and Teres Minor Research
3 Sub Sections

Movement Impairment and the Infraspinatus and Teres Minor

Common Trigger Points and Referral Pain Patterns for the Infraspinatus and Teres Minor

Exercises and Techniques for the Infraspinatus and Teres Minor
10 Sub Sections

Sample Intervention

Bibliography

  1. Donald A. Neumann, “Kinesiology of the Musculoskeletal System: Foundations of Rehabilitation – 2nd Edition” © 2012 Mosby, Inc.
  2. David B. Jenkins, Hollinshead's Functional Anatomy of the Limbs and Back: Eighth Edition © 2002 Saunders
  3. Holzbaur KR, Murray WM, Gold GE, Delp SL. Upper limb muscle volumes in adult subjects. J Biomech. 2007;40(4):742-9
  4. Lovering, R. M., & Russ, D. W. (2008). Fiber type composition of cadaveric human rotator cuff muscles. journal of orthopaedic & sports physical therapy, 38(11), 674-680.
  5. Johnson, M. A., Polgar, J., Weightman, D., & Appleton, D. (1973). Data on the distribution of fibre types in thirty-six human muscles: an autopsy study. Journal of the Neurological Sciences, 18(1), 111-129.
  6. Cynthia C. Norkin, Pamela K. Levangie, Joint Structure and Function: A Comprehensive Analysis: Fifth Edition © 2011 F.A. Davis Company
  7. Inman VT, Saunders JB, Abbot JC, Observatinos on the function of the shoulder joint. J Bone Joint Surg 26:1 - 30, 1944
    • Fascial Integration
  8. Benjamin, M. (2009). The fascia of the limbs and back–a review. Journal of anatomy, 214(1), 1-18.
  9. Stecco, C., Porzionato, A., Lancerotto, L., Stecco, A., Macchi, V., Day, J. A., & De Caro, R. (2008). Histological study of the deep fasciae of the limbs. Journal of bodywork and movement therapies, 12(3), 225-230.
  10. Stecco, C., Pavan, P. G., Porzionato, A., Macchi, V., Lancerotto, L., Carniel, E. L., … & De Caro, R. (2009). Mechanics of crural fascia: from anatomy to constitutive modelling. Surgical and Radiologic Anatomy, 31(7), 523-529.
  11. Levangin, H.M. 2006. Connective tissue: a body-wide signaling network? Med. Hypoththeses 66, 1074-1077
  12. Tom Myers, Anatomy Trains: Second Edition. © Elsevier Limited 2009
  13. Moccia D, Nackashi AA, Schilling R, Ward PJ. (2016). Fascial bundles of the infraspinatus fascia: anatomy, function, and clinical considerations. Journal of Anatomy. 228: 176-183.
  14. Chafik D, Galatz LM, Keener JD, Kim HM, Yamaguchi K. (2013). Teres minor muscle and related anatomy. J. Shoulder Elbow Surg. 22: 108-114.
  15. Tubbs RS, Shoja MM, Shokouhi G, Loukas M, Oakes WJ. Insertion of the pectoralis major into the shoulder joint capsule. Anat Sci Int. 2008 Dec;83(4):291-3
    • EMG Research
    • External Rotation at Different Angles
  16. Lee, D., Lee, S., & Han, S. (2016). Changes in the electromyographic activities of the infraspinatus and posterior deltoid according to abduction angles of the shoulder joint during shoulder external rotation in closed kinetic chain exercise. Journal of Physical Therapy Science, 28(10), 2748-2750. https://doi.org/10.1589/jpts.28.2748
  17. Ryan, G., Johnston, H., & Moreside, J. (2018). Infraspinatus isolation during external rotation exercise at varying ° of abduction. Journal of Sport Rehabilitation, 27(4), 334-339
  18. Hughes, P. C., Green, R. A., & Taylor, N. F. (2014). Isolation of infraspinatus in clinical test positions. Journal of Science and Medicine in Sport, 17(3), 256-260.
  19. Ha, S. M., Kwon, O. Y., Cynn, H. S., Lee, W. H., Kim, S. J., & Park, K. N. (2013). Selective activation of the infraspinatus muscle. Journal of athletic-training, 48(3), 346-352.
  20. Uga, D., Endo, Y., Nakazawa, R., & Sakamoto, M. (2016). Electromyographic analysis of the infraspinatus and scapular stabilizing muscles during isometric shoulder external rotation at various shoulder elevation angles. Journal of Physical Therapy Science, 28(1), 154-158.
    • External Rotation With and Without a Towel/Adduction
  21. Alizadehkhaiyat, O., Hawkes, D. H., Kemp, G. J., & Frostick, S. P. (2015). Electromyographic Analysis of the Shoulder Girdle Musculature During External Rotation Exercises. Orthopaedic journal of sports medicine, 3(11), 2325967115613988. https://doi.org/10.1177/2325967115613988
  22. Sakita, K., Seeley, M. K., Myrer, J. W., & Hopkins, J. T. (2015). Shoulder-muscle electromyography during shoulder external-rotation exercises with and without slight abduction. Journal of sport rehabilitation, 24(2), 109–115. https://doi.org/10.1123/jsr.2013-0116
  23. Bitter, N. L., Clisby, E. F., Jones, M. A., Magarey, M. E., Jaberzadeh, S., & Sandow, M. J. (2007). Relative contributions of infraspinatus and deltoid during external rotation in healthy shoulders. Journal of Shoulder and Elbow Surgery, 16(5), 563-568.
  24. Clisby, E. F., Bitter, N. L., Sandow, M. J., Jones, M. A., Magarey, M. E., & Jaberzadeh, S. (2008). Relative contributions of the infraspinatus and deltoid during external rotation in patients with symptomatic subacromial impingement. Journal of shoulder and elbow surgery, 17(1), S87-S92.
    • Internal and External Rotation with Various Tempos, Loads, and Unexpected Resistance
  25. Gaudet, S., Tremblay, J., & Begon, M. (2018). Muscle recruitment patterns of the subscapularis, serratus anterior and other shoulder girdle muscles during isokinetic internal and external rotations. Journal of sports sciences, 36(9), 985–993. https://doi.org/10.1080/02640414.2017.1347697
  26. Day, A., Taylor, N. F., & Green, R. A. (2012). The stabilizing role of the rotator cuff at the shoulder--responses to external perturbations. Clinical biomechanics (Bristol, Avon), 27(6), 551–556. https://doi.org/10.1016/j.clinbiomech.2012.02.003
  27. Dark, A., Ginn, K. A., & Halaki, M. (2007). Shoulder muscle recruitment patterns during commonly used rotator cuff exercises: an electromyographic study. Physical therapy, 87(8), 1039–1046. https://doi.org/10.2522/ptj.20060068
    • Comparing Joint Actions
  28. Tsuruike, M., & Ellenbecker, T. S. (2022). A comparison of teres minor and infraspinatus muscle activation in the prone position. JSES international, 6(1), 116-122.
  29. Wattanaprakornkul, D., Cathers, I., Halaki, M., & Ginn, K. A. (2011). The rotator cuff muscles have a direction-specific recruitment pattern during shoulder flexion and extension exercises. Journal of science and medicine in sport, 14(5), 376–382. https://doi.org/10.1016/j.jsams.2011.01.001
  30. Whittaker, R. L., Alenabi, T., Kim, S. Y., & Dickerson, C. R. (2022). Regional Electromyography of the Infraspinatus and Supraspinatus Muscles During Standing Isometric External Rotation Exercises. Sports health, 14(5), 725–732. https://doi.org/10.1177/19417381211043849
  31. Antony, N. T., & Keir, P. J. (2010). Effects of posture, movement and hand load on shoulder muscle activity. Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology, 20(2), 191–198. https://doi.org/10.1016/j.jelekin.2009.04.010
    • Comparing Various Exercises
  32. Reinold, M. M., Wilk, K. E., Fleisig, G. S., Zheng, N., Barrentine, S. W., Chmielewski, T., Cody, R. C., Jameson, G. G., & Andrews, J. R. (2004). Electromyographic analysis of the rotator cuff and deltoid musculature during common shoulder external rotation exercises. The Journal of Orthopaedic and Sports Physical Therapy, 34(7), 385–394. https://doi.org/10.2519/jospt.2004.34.7.385
  33. Calver, R., Alenabi, T., Cudlip, A., Dickerson, C. R., Mondal, P., & Kim, S. Y. (2022). Regional activation of supraspinatus and infraspinatus sub-regions during dynamic tasks performed with free weights. Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology, 62, 102308. https://doi.org/10.1016/j.jelekin.2019.05.009
  34. Boettcher, C. E., Ginn, K. A., & Cathers, I. (2009). Which is the optimal exercise to strengthen supraspinatus?. Medicine and science in sports and exercise, 41(11), 1979–1983. https://doi.org/10.1249/MSS.0b013e3181a740a7
  35. Marta, S. M., Pezarat-Correia, P. L., Carita, A. I., Fernandes, O. J., Cabri, J. M., & De Moraes, A. C. U. O. C. (2013). Electromyographic analysis of posterior deltoid, posterior rotator cuff and trapezius musculature in different shoulder exercises. International SportMed Journal, 14(1), 1-15.
  36. Townsend, H., Jobe, F. W., Pink, M., & Perry, J. (1991). Electromyographic analysis of the glenohumeral muscles during a baseball rehabilitation program. The American journal of sports medicine, 19(3), 264–272. https://doi.org/10.1177/036354659101900309
  37. Fukunaga, T., Orishimo, K. F., & McHugh, M. P. (2022). Electromyographic analysis of select eccentric-focused rotator cuff exercises. Physiotherapy theory and practice, 38(13), 2554–2562. https://doi.org/10.1080/09593985.2021.1949767
    • Hand Position During Horizontal Abduction
  38. Schoenfeld, B., Sonmez, R. G. T., Kolber, M. J., Contreras, B., Harris, R., & Ozen, S. (2013). Effect of hand position on EMG activity of the posterior shoulder musculature during a horizontal abduction exercise. The Journal of Strength & Conditioning Research, 27(10), 2644-2649.
    • EMG Activity During Passive and Active Assisted Rehabilitation Exercise (Healthy Individuals):
  39. Jung, M. C., Kim, S. J., Rhee, J. J., & Lee, D. H. (2016). Electromyographic activities of the subscapularis, supraspinatus and infraspinatus muscles during passive shoulder and active elbow exercises. Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA, 24(7), 2238–2243. https://doi.org/10.1007/s00167-015-3586-8
  40. Cross, A., deVries, J., Vetter, C.S., Mocarski, M., Ketchum, N.,Compty, E., Krimmer, M., Fritz. (2020). "Electromyography of the shoulder musculature during passive rehabilitation exercises." Journal of Shoulder and Elbow Arthroplasty, 4 (2020): 2471549220960044.
  41. Gurney, A. B., Mermier, C., LaPlante, M., Majumdar, A., O'Neill, K., Shewman, T., & Gurney, J. G. (2016). Shoulder Electromyography Measurements During Activities of Daily Living and Routine Rehabilitation Exercises. The Journal of orthopaedic and sports physical therapy, 46(5), 375–383. https://doi.org/10.2519/jospt.2016.6090
    • Sports Activities
  42. Kelly, B. T., Backus, S. I., Warren, R. F., & Williams, R. J. (2002). Electromyographic analysis and phase definition of the overhead football throw. The American journal of sports medicine, 30(6), 837–844. https://doi.org/10.1177/03635465020300061401
  43. Ryu, R. K., McCormick, J., Jobe, F. W., Moynes, D. R., & Antonelli, D. J. (1988). An electromyographic analysis of shoulder function in tennis players. The American journal of sports medicine, 16(5), 481–485. https://doi.org/10.1177/036354658801600509
  44. Nuber, G. W., Jobe, F. W., Perry, J., Moynes, D. R., & Antonelli, D. (1986). Fine wire electromyography analysis of muscles of the shoulder during swimming. The american journal of sports medicine, 14(1), 7-11.
    • Various Exercises With and Without Shoulder Pain
  45. Diederichsen, L. P., Nørregaard, J., Dyhre-Poulsen, P., Winther, A., Tufekovic, G., Bandholm, T., Rasmussen, L. R., & Krogsgaard, M. (2009). The activity pattern of shoulder muscles in subjects with and without subacromial impingement. Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology, 19(5), 789–799.
  46. Ballantyne, B. T., O'Hare, S. J., Paschall, J. L., Pavia-Smith, M. M., Pitz, A. M., Gillon, J. F., & Soderberg, G. L. (1993). Electromyographic activity of selected shoulder muscles in commonly used therapeutic exercises. Physical therapy, 73(10), 668–682. https://doi.org/10.1093/ptj/73.10.668
  47. Ellsworth, A. A., Mullaney, M., Tyler, T. F., McHugh, M., & Nicholas, S. (2006). Electromyography of selected shoulder musculature during un-weighted and weighted pendulum exercises. North American journal of sports physical therapy: NAJSPT, 1(2), 73.
    • Scaption With and Without Shoulder Pain
  48. Reddy, A. S., Mohr, K. J., Pink, M. M., & Jobe, F. W. (2000). Electromyographic analysis of the deltoid and rotator cuff muscles in persons with subacromial impingement. Journal of shoulder and elbow surgery, 9(6), 519–523. https://doi.org/10.1067/mse.2000.109410
  49. Sole, G., Osborne, H., & Wassinger, C. (2014). Electromyographic response of shoulder muscles to acute experimental subacromial pain. Manual Therapy, 19(4), 343-348.
  50. Myers, J. B., Hwang, J. H., Pasquale, M. R., Blackburn, J. T., & Lephart, S. M. (2009). Rotator cuff co-activation ratios in participants with subacromial impingement syndrome. Journal of science and medicine in sport, 12(6), 603–608. https://doi.org/10.1016/j.jsams.2008.06.003
    • Functional Tasks With and Without Pain
  51. Glousman, R., Jobe, F., Tibone, J., Moynes, D., Antonelli, D., & Perry, J. (1988). Dynamic electromyographic analysis of the throwing shoulder with glenohumeral instability. The Journal of bone and joint surgery. American volume, 70(2), 220–226.
  52. Kelly, B. T., Williams, R. J., Cordasco, F. A., Backus, S. I., Otis, J. C., Weiland, D. E., Altchek, D. W., Craig, E. V., Wickiewicz, T. L., & Warren, R. F. (2005). Differential patterns of muscle activation in patients with symptomatic and asymptomatic rotator cuff tears. Journal of shoulder and elbow surgery, 14(2), 165–171. https://doi.org/10.1016/j.jse.2004.06.010
    • Movement Impairment
  53. Phillip Page, Clare Frank, Robert Lardner, Assessment and Treatment of Muscle Imbalance: The Janda Approach © 2010 Benchmark Physical Therapy, Inc., Clare C. Frank, and Robert Lardner
  54. Sahrmann, S.A. Diagnoses and Treatment of Movement Impairment Syndromes, © 2002 Mosby Inc.
  55. José Miota Ibarra, Hong-You Ge, Chao Wang, Vicente Martínez Vizcaíno, Thomas Graven-Nielsen, Lars Arendt-Nielsen. Latent Myofascial Trigger Points are Associated With an Increased Antagonistic Muscle Activity During Agonist Muscle Contraction. The Journal of Pain, Volume 12, Issue 12, December 2011, Pages 1282–1288
    • Trigger Point Assessment:
  56. David G. Simons, Janet Travell, Lois S. Simons, Travell & Simmons’ Myofascial Pain and Dysfunction, The Trigger Point Manual, Volume 1. Upper Half of Body: Second Edition,© 1999 Williams and Wilkens
  57. Moccia D, Nackashi AA, Schilling R, Ward PJ. (2016). Fascial bundles of the infraspinatus fascia: anatomy, function, and clinical considerations. Journal of Anatomy. 228: 176-183.

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