Head of the humerusShoulder joint flexion 90° and rotation inside, rotation outside, can feel humeral head rotation, rotation inside can touchThe greater tuberosity and the lesser tuberosity of the humerus and the intertubercular sulcus. (FIG. 2-38)Shoulder peakAt the lateral end of the clavicle. (figure 2-39) the outer end of the scapula and the acromion of the clavicleThe acromioclavicular joints. The lower and posterior margins of the acromion areThe attachment point of the deltoid muscle. (FIG. 2-41)
The shoulder blade surfaceIt is palpable on the outside of the acromioclavicular joint. (FIG. 2-42)
coracoid: in the medial side of the head of the humerus and below the clavicle, the tip of the coracoid process and the medial margin can be felt. It is the attachment point of biceps brevis tendon, coracoid brachial muscle and pectoralis minor muscle. 43) (FIG. 2 –Biceps grooveInternal rotation of the upper arm, proximal to the middle of the humerus, the groove containing the long head of the biceps and its tendons. 44) (FIG. 2 –
The anterior deltoid and coracoid brachial muscles are the major flexors of the shoulder joint. Pectoralis major is the interstitial fibers, biceps brachii, serratus anterior and trapezius minor flexors. (FIG. 2-45)
Deltoid muscleThe starting point is 1/3 of the outer clavicle, acromion and scapular ridge. The insertion point is the deltoid tuberosity of the humerus. Posterior muscle band (spine) : abductor shoulder joint 90° flexion elbow, accessible at the back of shoulder joint. (figs. 2-46, 2-47) the middle band (acromion) : the middle part of the shoulder abducts between the anterior and posterior bands. (figure 2-48) the anterior band of the deltoid (clavicle) : push the shoulder forward horizontally to touch the band. (FIG. 2-49)
Beak brachial muscleAnterior flexion abduction of the arm and flexion of the elbow, a taut cord muscle is felt on the medial side of the arm and behind the biceps. (figure 2-50) starting point: coracoid process. Insertion: middle medial humerus. (FIG. 2-51)
Biceps abdominisIn front of the elbow, in front of the arm down to the deltoid, flex and extend the elbow joint to better show the belly of the muscle. (FIG. 2-52)
Biceps abdominisProximal one third in front of the upper arm, near the pectoralis major. 53) (FIG. 2 –
The biceps tendon: after the forearm is rotated, the resistance flexes the elbow joint, which can be touched at the elbow socket. (FIG. 2-54)
Biceps originThe long head rises from the tubercle on the scapular pelvis and the short head from the coracoid process. The terminal point is the radial tuberosity. (FIG. 2-55)
Before saw muscleRepeat the short inhalation with visible fingerlike projections attached to the ribs between the latissimus dorsi muscle at the back and the pectoralis major muscle at the front. (figure 2-56) starting point: 1st to 8th rib. Dead point: medial margin of scapula and lower Angle. (FIG. 57) 2 –
Trapezius muscleThe upper fibers extend from the occipital protuberance to the outer third of the clavicle. The lower fibers are attached to the medial side of the scapular ridge and run down the medial side of the spinous process of the lower thoracic vertebra. Press down shoulder blade obviously. The middle fibers are palpable from the acromion to the spine of the 7th cervical vertebra and the upper thoracic vertebra, with the scapula clearly receding. The trapezius muscle is flat, with no tension or tenderness due to the rotation of the fibers touching the cord-like structure. (figure 58) 2 –
The posterior fibers of the latissimus dorsi, teres major, and deltoid musclesIt is the major extensor of the shoulder joint. The teres minor and triceps brachii long head qualify as extensors. Shoulder extension pain suggests tendonitis of the constrictor muscle. (figure 2 to 59)
3, stretched out straight
The latissimus dorsiThe muscle can be felt on the medial side of the upper arm, posterolateral to the thoracic cage. (figure 2-60) starting from the lower 6 thoracic spinous processes and all lumbar spinous processes and iliac crest. Insertion: minor tuberous crest of humerus. (picture 2-62, 2-63)
The great circle muscleOn the inner side of the upper arm, the rib cage is pushed up on the back side, and there is a distinct muscular protuberance. (FIG. 2-61)
Small circular muscleShoulder abduction, elbow flexion 90° each, forearm pronation, between deltoid and teres major at the lateral margin of the scapula. (FIG. 2-64)
Brachial triceps longhead proximal end tendon: shoulder joint abduction, elbow joint flexion 90°, forearm distal end resistance abduction elbow joint, the back of the shoulder deltoid muscle fiber and the lateral side of the teres minor muscle can touch the tendon. (FIG. 2-65)
The triceps: origin: long head from subglenoid tubercle; The medial head arises from the bony surface below the groove of the radial nerve; The lateral head arises from the bony surface outside and above the groove of the radial nerve. Dead point: olecranon. (picture 2-66, 2-67)
The middle fibers of deltoid and supraspinatus are abductor muscles of shoulder joint.
The anterior and posterior fibers of the deltoid and serratus anterior assist.
Resistance shoulder abduction pain suggests contraction tendonitis. (picture 2-68, 2-69)
4, and outreach
The middle (acromion) band of the deltoid: the middle part of the shoulder lies between the anterior and posterior tracts.
Supraspinatus muscle: abductor of the arm and palpable in the supraspinatus fossa. (FIG. 2-70)
Pectoralis major: starting point: medial half of the clavicle, sternum, 1st to 6th costal cartilage. Insertion: greater tuberous crest of the humerus. (picture 2-71, 2-72, 2-73, 2-74)
6, and internal rotation
Subscapularis, latissimus dorsi, teres major, pectoralis majorIt is the major internal rotator muscle of the shoulder joint. (FIG. 2-75)
Shoulder joint internal rotation pain is caused by tendonitis.
subscapularisTo touch this muscle, there must be a space between the scapula and the thoracic cage. The lateral part of the finger is the latissimus dorsi, the medial front is the pectoralis major, and the lower part of the finger is the subscapularis. (figure 2-76) starting point: subscapular fossa. Insertion: nodule of humerus. (FIG. 2-77)
The infraspinatus and the teres minorThe major muscles of the shoulder. The posterior fibers of the deltoid assist in external rotation. (FIG. 2-78)
The infraspinatus:Starting point: subscapular fossa. Insertion: the greater tuberosity of the humerus in the middle, palpable in the subspinous fossa. (FIG. 2-79)
Small circular muscle:Starting point: back of lateral margin of scapula. The insertion point below the greater tuberosity of the humerus is palpable between the deltoid and teres major at the lateral margin of the scapula. (picture 2-80, 2-81)
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