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Oct 30, 2023 · Bones, ligaments, muscles and movements of the shoulder joint. The glenohumeral, or shoulder, joint is a synovial joint that attaches the upper limb to the axial skeleton. It is a ball-and-socket joint, formed between the glenoid fossa of scapula (gleno-) and the head of humerus (-humeral). Acting in conjunction with the pectoral girdle, the ...
- 22 min
- Anatomical Structure
- Movements
- Mobility and Stability
- Blood Supply
Articulating Surfaces
The shoulder jointis formed by an articulation between the head of the humerus and the glenoid cavity (or fossa) of the scapula. This gives rise to the alternate name for the shoulder joint – the glenohumeral joint. Like most synovial joints, the articulating surfaces are covered with hyaline cartilage. The head of the humerus is much larger than the glenoid fossa, giving the joint a wide range of movement at the cost of instability. To reduce the disproportion in surfaces, the glenoid fossa...
Joint Capsule
Thejoint capsuleis a fibrous sheath which encloses the structures of the joint. It extends from the anatomical neckof the humerus to the border or ‘rim’ of the glenoid fossa. The joint capsule is lax – permitting greater mobility (particularly abduction). The synovial membranelines the inner surface of the joint capsule and produces synovial fluid to reduce friction between the articular surfaces.
Ligaments
Ligaments play an important role in stabilising the shoulder joint: 1. Glenohumeral ligaments (superior, middle and inferior) – extend from the humerus to the glenoid fossa, reinforcing the joint capsule. They act to stabilise the anterior aspect of the joint. 2. Coracohumeral ligament – extends from the base of the coracoid process to the greater tubercle of the humerus. It supports the superior part of the joint capsule. 3. Transverse humeral ligament – extends between the two tubercles of...
The shoulder joint is an extremely mobilejoint, with a wide range of movement possible: 1. Extension (upper limb backwards in sagittal plane) – posterior deltoid, latissimus dorsi and teres major. 2. Flexion (upper limb forwards in sagittal plane) – pectoralis major, anterior deltoid and coracobrachialis. Biceps brachii weakly assists in forward fl...
The shoulder joint is one of the most mobile in the body, at the expense of stability. Here, we shall consider the factors the permit movement, and those that contribute towards joint structure. Mobility: 1. Type of joint – ball and socket joint. 2. Bony surfaces – shallow glenoid cavity and large humeral head – there is a 1:4 disproportion in surf...
The shoulder joint is supplied by the anterior and posterior circumflex humeralarteries – which are both branches of the axillary artery. There are also contributions from the suprascapular artery (itself a branch of the thyrocervical trunk).
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Anatomy and Biomechanics. The shoulder complex involves 3 physiological joints and one floating joint: You can also consider the contributions of the sternocostal, vertebrocostal, and sternomanubrium joints when thinking about movement involving the shoulder complex. The SC joint is the only bony attachment site of the upper extremity to the ...
- Tessa Sawyers
- Shoulder flexion. Flexion is a movement that decreases the angle between the two parts that the joint is connecting. If you hold your arms straight and palms against your sides and raise your arms in front of your body to point your hands at something in front of you, you’re practicing flexion.
- Shoulder extension. Extension is a movement that increases the angle between the two parts that the joint is connecting. If you reach your hands behind you — think about putting something in your back pocket — you’re practicing extension.
- Shoulder abduction. Abduction occurs when you have arm movement away from the middle of your body. When you raise your arm out from the sides of your body, it’s an abduction of your shoulder.
- Shoulder adduction. Shoulder adduction occurs when you move your arms towards the middle of the body. If you hug yourself, your shoulders are adducting.
Jul 15, 2014 · The muscle motion, kinesiology and anatomy of shoulder abduction.Learn exactly what is happening when the shoulder goes into a process known as shoulder abdu...
- 42 sec
- 190.3K
- Muscle and Motion
May 4, 2023 · In general terms, abduction, in the anatomical sense, is classified as the motion of a limb or appendage away from the midline of the body. In the case of arm abduction, it is the movement of the arms away from the body within the plane of the torso (coronal plane). The abduction of the arm begins with the arm in a position parallel to the torso and the hand in an inferior position, continues ...
People also ask
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The shoulder is a complex anatomical structure consisting of four joints. [1] Movements at the shoulder enable us to move and position our arm and hand in space. The muscles of the shoulder provide a stable base for these upper extremity movements. The dynamic relationship between the shoulder muscles, ligaments and bony articulations allows ...
