NUR 0012 Lecture 21 Ch. 10 Muscular System Cont. Outline of Last Lecture I. Ch. 8 wrap upA. Unhappy triad injuryB. Glenohumeral jointC. Acromioclavicular jointD. Coxal jointE. Nursemaid’s elbowF. Temporomandibular jointG. Talocrural jointII. Ch. 9 muscular systemA. FunctionsB. General featuresC. Muscle nomenclatureOutline of Current LectureI. Ch. 10 cont.A. Deeper and stronger anterior neck musclesB. Head and neck: superficial posteriorC. Deeper and stronger posterior neck musclesThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.D. Erector spinae groupE. Abdominals F. Diaphragm G. Main movements of the scapulaCurrent LectureI. Ch. 10 cont.A. Deeper and stronger anterior neck muscles1. Middle scalene 2. Anterior scalene3. Posterior scaleneB. Head and neck: superficial posterior1. Trapezius: primarily a scapula mover2. Latissimus dorsi: powerful arm muscleC. Deeper and stronger posterior neck musclesD. Erector spinae group: strongest back extensors, act as a group1. Iliocostalis: most lateral 2. Longissmus 3. SpinalisE. Abdominals 1. Aponeurosis of the external oblique: sheath of tendon that stuff attaches to right under the skin2. Rectus abdominus: a fixator, segmented a. Linea albab. Tendinous intersections3. Transversus (important for going to bathroom, increase abdominal pressure) and oblique muscles are synergists to Rectus abdominisa. External and internal obliquesF. Diaphragm: when it contracts, the volume of the chest increases, primary respirationmuscle1. External intercostals aid in inspiration , pull up on ribs elevating rib cage2. Internal intercostals aid in “forced expiration”, primarily in exercise, run in opposite direction of external, pull down on ribs helping to get more air outG. Main movements of the scapula are elevation/depression and protraction/retraction1. Loosely attached to rib cage2. Muscles on anterior side are protractors3. Muscles that originate in head and neck are primarily elevators4. Muscles that originate in trunk are depressors5. Posterior scapular moversa. Trapezius: weak neck extensor, movements primarily on scapula though, its own antagonist1) Fibers arranged in 3 discrete bundlesa) Upper fibers are elevatorsb) Middle fibers are retractors c) Lower fibers are depressors: pull trapezius downb. Levator scapulae: underneath trapezius, bigger, more powerful shoulder elevatorc. Rhomboid minor and major: originate from lower cervical vertebrae, primarily
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