2. Shoulder-thoracic joint: not an anatomical joint. Clinically, it is generally composed of acromioclavicular joint, sternoclavicular joint and thoracoscapular joint. It is not a joint in the actual sense, but a joint connecting bones, which can dominate the activities of upper limbs and shoulder joints. The movement of the shoulder joint will also lead to a certain degree of mobility of these muscles. It mainly affects the muscles: pectoralis minor, serratus anterior, pectoralis major and deltoid; Dorsal muscle-abductor (up and down), levator scapulae, serratus anterior, rhomboid (size), latissimus dorsi, trapezius.
Deltoid (anterior, middle and posterior fasciculus), biceps brachii and triceps brachii (lateral head and long muscle)-mainly related to the elbow joint of the arm.
Subscapular muscle
Starting point: subscapular fossa
Stop point: humeral tubercle
Function: adduction and pronation of shoulder joint (C5-6 subscapular nerve)
Supraspinal muscle
Starting point: supraspinatus fossa of scapula
Stop point: upper part of greater tubercle of humerus
Function: Shoulder abduction (suprascapular nerve C5-6)
infraspinatus
Starting point: infraspinatus fossa of scapula
Stop point: middle part of greater tubercle of humerus
Function: Shoulder external rotation (suprascapular nerve C5-6)
teres minor
Starting point: back of lateral margin of scapula
Stop point: lower part of greater tubercle of humerus
Function: Shoulder external rotation (axillary nerve C5-7)
curassow
Starting point: the back of the lower corner of the scapula
Stop point: crest of humeral tubercle
Function: Shoulder extension, adduction and pronation (subscapular muscle C5-6)
Anterior and posterior bundles of deltoid muscle
Starting point: toe, acromion, lateral clavicle of scapular crest1/3; The posterior bundle originated from the lateral margin of the scapular ridge.
Stop point: tuberosity of deltoid muscle of humerus
Functions: shoulder abduction, flexion, pronation (adduction), shoulder extension, supination (adduction).
musculus pectoralis major
Starting point: medial clavicle, sternum, ribs 1-6.
Stop point: crest of greater tuberosity of humerus
Function: Main functions: adduction and pronation and shoulder flexion.
musculus pectoralis minor
Starting point: rib 3-5 or rib 2-5 (rib change)
Stop point: coracoid process of scapula
Function: when the scapula is fixed, pull the scapula upward, forward and downward, and lift the ribs to help inhale (medial thoracic nerve).
serratus anterior
Starting point: the side of rib 1-8 or 9.
Stop point: the medial edge and lower corner of scapula.
Function: Pull the scapula forward (long thoracic nerve 5-7)
Musculus posterior superior digitorum
Starting point: C6-7 spinous process and T 1-2 spinous process.
Stop point: Outside the 2nd-5th rib angle.
Function: Rib lifting (intercostal nerve T 1-4)
Musculus digitorum posterior inferior
Starting point: c11-kloc-0/2 and L 1-2 spinous process.
Stop point: 9- 12 outside the rib angle.
Function: descending rib (intercostal nerve T9- 12)
Rhomboid muscle
Starting point: T 1-4 spinous process
Stop point: the lower part of the medial edge of scapula.
Function: Lift and pull the scapula (dorsal scapular nerve C4-6) inward.
Musculus rhomboideus
Starting point: C6-7 spinous process
Stop point: the upper part of the medial edge of scapula.
Function: Lift and pull the scapula (dorsal scapular nerve C4-6) inward.
levator scapulae
Starting point: C 1-4 cervical transverse process
Stop point: medial angle of scapula
Function: Lift the scapula (dorsal scapular nerve C4-6).
latissimus dorsi
Starting point: T7- 12 spinous process, L 1-5 spinous process, iliac crest.
Stop point: humeral tubercle
Function: shoulder extension, adduction and pronation (thoracic dorsal nerve C-8)
trapezius
Starting point: supranuchal line, extraoccipital protuberance, nuchal ligament and all thoracic spinous processes.
Stop point: clavicle, acromion, outside scapular crest 1/3.
Function: pull both sides close to the midline, the upper fiber lifts the scapula, and the lower fiber lowers the scapula (accessory nerve).
Related bone markers: clavicle, humerus (big and small nodules), humeral tuberosity, scapula (medial and lateral edges, upper and lower parts), supraspinatus fossa, coracoid process, cervical C spinous process, cervical C transverse process, thoracic T spinous process, lumbar L spinous process and iliac crest.
Summary: Main functions-
1 Joint movements such as shoulder flexion, extension, pronation, supination, adduction and abduction.
2. It is the key muscle group that determines human shoulder activities, such as daily activities such as lifting arms and "hooking shoulders".
When these muscles are locally tense or overstretched, they will appear:
1, posture problems: round shoulders, sliding shoulders, bare shoulders, high and low shoulders, hunched back, hunched chest, head lead, wealth bag, bye-bye meat.
2, pain health problems: scapulohumeral periarthritis, shoulder pain, stiff neck, arm numbness.
3. Impact on life span: the stability of joints is reduced. When the external force suddenly hits or pulls, it is easy to cause dislocation or dislocation of humerus and strain of pectoral muscle.
The intercostal muscle and diaphragm also play a considerable role, spreading in the trunk chapter of the body.
The pictures refer to 3Dbody, and the articles are arranged for self-study notes. Errors are inevitable and are for reference only.