Axillary region, deltoid region and scapular region.
The shoulder generally refers to the shoulder, and its structure can be divided into three areas: axillary area, deltoid area and scapular area, including bones, muscles and ligaments.
Shoulder is the foundation of upper limb movement, and it is also the joint part with great mobility and flexibility in human movement. It controls shoulder activities, such as daily lifting, which is more important to the human body. Pay attention to protection in life, maintain correct posture, and avoid trauma such as impact and extrusion.
1. Axillary region: Axillary region is located under the shoulder joint. When the upper arm is abduction, skin depression will appear in the armpit. This area, called the armpit, consists of a roof, a fossa and four walls. The four walls mainly include pectoralis major, pectoralis minor, latissimus dorsi, teres major, serratus anterior, coracoid and brachial muscles.
In addition, axillary arteries, axillary veins, brachial plexus, axillary lymph nodes and other tissues are distributed under the armpit to maintain local blood circulation and muscle traction;
2. Deltoid muscle area: refers to the area where deltoid muscle is located, with thick skin, less fat and dense superficial fascia, and there is also a deltoid subcapsule communicating with the acromion subcapsule. The deltoid muscle in this part is inverted triangle, which can wrap the shoulder joint. At the same time, there are two axillary nerves in the deep surface of deltoid muscle, which can control the activity of deltoid muscle and make the shoulder abduction.
3. Scapular area: refers to the area behind the scapula, where the skin is thicker and more superficial fascia tissue is distributed. The deep structure of scapular region includes supraspinatus, teres minor, teres major and other muscle tissues.
Tendon cuff is a combination of local muscle tissue and tendon, which can stabilize shoulder joint. In addition, there are blood vessels and nerve tissues such as suprascapular vein, subscapular artery and suprascapular nerve.