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Trapezius: Upper, Middle, and Lower fibers. Axio-Scapular/ Axio-Clavicular group Attachments: Proximal: Superior nuchal line on occipital bone (posterior.

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Presentation on theme: "Trapezius: Upper, Middle, and Lower fibers. Axio-Scapular/ Axio-Clavicular group Attachments: Proximal: Superior nuchal line on occipital bone (posterior."— Presentation transcript:

1 Trapezius: Upper, Middle, and Lower fibers

2 Axio-Scapular/ Axio-Clavicular group Attachments: Proximal: Superior nuchal line on occipital bone (posterior skull) + C1-T12 vertebrae (spinous process) Distal: Upper: lateral clavicle Middle: acromion + spine of scapula Lower: base (medial end) of spine of scapula Action: (scapular motion) U: UPWARD rotate, ADduct (retract), elevate M: ADduct (retract) L: UPWARD rotate, ADduct (retract), depress PERIPHERAL NERVE + spinal cord level of origin: Cervical nerves + cranial nerve XI (spinal accessory nerve) Spinal segments: C1,2,3,4,5

3 Levator scapulae

4 Axio-Scapular/ Axio-Clavicular group Attachments: Proximal: upper cervical vertebrae (transverse process of C1-C4) Distal: medial boarder of scapula, superior to spine Action: (scapular motion) Elevate, downward rotate PERIPHERAL NERVE + spinal cord level of origin: Cervical nerves: 3,4 + dorsal scapular nerve: C5 Spinal segments: C3,4,5

5 Rhomboid minor

6 Axio-Scapular/ Axio-Clavicular group Attachments: Proximal: lower cervical vertebrae (spinous process of C7-T1) Distal: medial border of scapula, at base of spine Action: (scapular motion) Elevate, ADduct (retract), downward rotate PERIPHERAL NERVE + spinal cord level of origin: Dorsal scapular nerve: C5 Spinal segment: C5

7 Rhomboid major

8 Axio-Scapular/ Axio-Clavicular Attachments: Proximal: upper thoracic vertebrae (spinous process of T2-T5) Distal: medial border of scapula, inferior to spine Action: (scapular motion) Elevate, ADduct (retract), downward rotate PERIPHERAL NERVE + spinal cord level of origin Dorsal scapular nerve: C5 Spinal segment: C5

9 Serratus anterior

10 Axio-Scapular/ Axio-Clavicular group Attachments: Proximal: lateral surface of ribs 1-8 Distal: medial border of scapula, entire length, on COASTAL surface Actions: (scapular motion) UPWARD rotate, ABduct (protract) – prevents winging PERIPHERAL NERVE + spinal cord level of origin: Long thoracic nerve: C5,6,7 Spinal segments: C5,6,7

11 Pectoralis minor

12 Axio-Scapular/ Axio-Clavicular group Attachments: Proximal: anterior surface of ribs 3-5 Distal: coracoid process of scapula Actions: (scapular motion) ABduct (protract), downward rotate, depress PERIPHERAL NERVE + spinal cord level of origin: Lateral + medial pectoral nerves: C5,6,7 + C8, T1 Spinal segments: C7,C8

13 Pectoralis major: Clavicular head (upper fibers) Sternal head (lower fibers)

14 Axio- Humeral group Attachments: Proximal: Clavicular head (CL) – medial clavicle sternal head (ST) – sternum (manubrium and body of sternum, plus the adjacent costal cartilages of ribs 2-6) Distal: All fibers to LATERAL lip of the intertubercular groove of the humerus (crest of the greater tubercle) Actions: CL head: flex, ADduct, IR, H. AD the gleno-humeral joint ST head: extend (from 180), ADduct, IR, H. AD the gleno-humeral joint ELEVATE TRUNK in closed kinematic chain with humerus stabilized (weight bearing on hands) (ALSO: protract + depress shoulder girdle) PERIPHERAL NERVE + spinal cord level of origin: CL head = LATERAL pectoral nerve: C5,6,7 ST head = Lateral + Medial pectoral nerves: C5,6,7 + C8, T1 Spinal segments: CL head: C5,6,7 ST head: C6,7,8, T1

15 Latissimus dorsi

16 Axio-Humeral group Attachments: Proximal: Vertebral column from T7 to sacrum + iliac crest (T7-T12 is directly from spinous process of vert., while L+S levels and iliac crest are via thoraco-lumbar fascia) Also, (small attachment to inferior tip of scapula) Distal: FLOOR of intertubercular groove of humerus Actions: Extend, ADduct, IR, H. AB at gleno-humeral joint ELEVATE TRUNK in closed kinematic chain with humerus stabilized (weight bearing on hands) (ALSO: retract + depress shoulder girdle, and downward rotate scapula via small attachment to inferior tip of scapula) PERIPHERAL NERVE + spinal cord level of origin: Thoracodorsal nerve: C6,7,8 Spinal segments: C6,7,8

17 Supraspinatus Muscle of the ROTATOR CUFF “S---” of “SITS”

18 Scapulo-Humeral group Attachments: Proximal: supraspinous fossa of scapula Distal: greater tubercle of humerus, UPPER facet Actions: ABduct at gleno-humeral joint (does NOT rotate) Also; supports head of humerus in glenoid fossa PERIPHERAL NERVE + spinal cord level of origin: Suprascapular nerve: C5,6 Spinal segment: C5

19 Infraspinatus Muscle of the ROTATOR CUFF “-I--” of “SITS”

20 Scapulo-Humeral group Attachments: Proximal: infraspinous fossa of scapula Distal: greater tubercle of humerus, MIDDLE facet Actions: External rotation of gleno-humeral joint. Also; depress head of humerus (compress + stabilize the GH jt) PERIPHERAL NERVE + spinal cord level of origin: Suprascapular nerve: C5,6 Spinal segments: C5,6

21 Teres minor Muscle of the ROTATOR CUFF “- -T-” of “SITS”

22 Scapulo-Humeral group Attachments: Proximal: lateral boarder of scapula at mid-length Distal: greater tubercle of humerus, LOWER facet Actions: External rotation of gleno-humeral joint. Also; depress head of humerus (Compress + stabilize the GH jt). PERIPHERAL NERVE + spinal cord level of origin: Axillary nerve: C5,6 Spinal segments: C5,6

23 Subscapularis Muscle of the ROTATOR CUFF “- - - S” of “SITS”

24 Scapulo-Humeral group Attachments: Proximal: subscapular fossa of scapula Distal: lesser tubercle of humerus Actions: Internal rotation of gleno-humeral joint. Also, depress head of humerus PERIPHERAL NERVE + spinal cord level of origin: Upper + lower subscapular nerves: C5,6 Spinal segments: C5,6

25 Deltoid: Anterior, Middle, and Posterior fibers

26 Scapulo-Humeral group Attachments: Proximal: Anterior: lateral clavicle Middle: acromion process of scapula Posterior: spine of scapula Distal: ALL to deltoid tuberosity of humerus (Compare this to gluteus medius arrangement, especially the actions) Actions: A: ABduct, flex, IR and H. AD at GH jt M: ABduct GH jt P: ABduct, extend, ER, and H. AB at GH jt PERIPHERAL NERVE + spinal cord level of origin: Axillary nerve: C5,6 Spinal segments: C5,6

27 Teres major

28 Scapulo-Humeral group Attachments: Proximal: lateral boarder of scapula at inferior angle Distal: MEDIAL lip of intertubercular groove of humerus (crest of lesser tubercle) Actions: Extend, ADduct, IR at GH jt PERIPHERAL NERVE + spinal cord level of origin: Lower subscapular nerve: C5,6 Spinal segment: C6

29 Coracobrachialis

30 Scapulo-Humeral group Attachments: Proximal: coracoid process of scapula Distal: mid-humerus, medial side Actions: Flex, ADduct at GH jt PERIPHERAL NERVE + spinal cord level of origin: Musculocutaneous nerve: C5,6,7 Spinal segments: C6,7

31 Biceps brachii: Long head, Short head

32 Scapulo-Forearm group Attachments: Proximal: Long head: supraglenoid tubercle of scapula Short head: coracoid process of scapula Distal: BOTH heads; radial tuberosity + bicipital aponeurosis Actions: Both heads: flex GH jt + flex elbow, supinate forearm PERIPHERAL NERVE + spinal cord level of origin: Musculocutaneous nerve: C5,6,7 Spinal segments: C5,6

33 Triceps brachii: Long head, Lateral head, and Medial head (deep)

34 Scapulo-Forearm group Attachments: Proximal: Long head: infraglenoid tubercle of scapula Lateral head: posterior humerus, superior to radial groove Medial head (deep): posterior humerus, inferior to radial groove Distal: ALL 3 heads; olecranon process of ulna Actions: Long head: extend GH joint ALL 3 HEADS: extend elbow joint PERIPHERAL NERVE + spinal cord level of origin: Radial nerve: C5-T1 Spinal segments: C7,C8

35 Anconeus

36 Scapulo-Forearm group Attachments: Proximal: lateral epicondyle of humerus Distal: olecranon process of ulna Actions: Extend elbow joint PERIPHERAL NERVE + spinal cord level of origin: Radial nerve: C5-T1 Spinal segments: C7,C8

37 Brachialis

38 Elbow: muscles of the brachium acting at the elbow Attachments: Proximal: anterior distal shaft of humerus Distal: anterior proximal shaft of ulna (ulnar tuberosity) Actions: Flex elbow PERIPHERAL NERVE + spinal cord level of origin: Musculocutaneous nerve: C5,6,7 Spinal segments: C5,6

39 Brachioradialis

40 Elbow: muscles of the brachium acting at the elbow Attachments: Proximal: lateral supracondylar ridge of humerus Distal: styloid process of distal radius Actions: Flex elbow PERIPHERAL NERVE + spinal cord level of origin: Radial nerve: C5-T1 Spinal segments: C5,6


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