The elbow is the joint that connects the arm with the forearm , connecting the distal part of the humerus bone with the proximal ends of the ulna and radius bones .
Summary
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- 1 Elbow structures
- 2 Constitution
- 3 Classification of the joint
- 4 Elbow muscles
- 5 Exercises
- 1 Elbow flexions
- 6 Sources
Elbow structures
- Bonesand joints .
- Ligamentsand tendons .
- Blood vessels.
- Nerves.
Constitution
It consists of three bones : the distal extremity of the humerus and the proximal extremities or epiphyses of the ulna and radius . The union of these bones, form three joints included in the same capsule:
- Articulation radial humerus is constituted by the humeral head and the articular fossa of the headof the radius , forming a spheroidal articulation in form.
- Hummeroulnar joint: The articular surfaces are the humeral trochlea and the trochlear notch of the ulna, making it a trochlear joint due to the shape of the articular faces.
- Proximal radioulnar joint: It is made up of the articular circumference of the radius and the radial notch of the ulna and is a cylindrical joint due to the shape of the articular faces.
Joint classification
- It is a synovial joint, due to the structural characteristics of the union.
- It is a compound joint, it has more than two articular faces (it has 6 articular faces).
- Depending on the shape, its classification becomes difficult since within the same joint capsule it has three joints of different shapes, one spheroidal, one trochlear and another trochoid.
- According to the movements, it is a biaxial joint since it performs flexion and extension movementsof the forearm , pronation and supination movements of the forearm, flexion and extension of the forearm around a frontal axis, and pronation and supination around a vertical axis.
Elbow muscles
- Extension muscles: triceps brachii, anconeus .
- Flexion muscles: anterior brachial, brachioradial (long supinator) and biceps brachii .
- Supination muscle: short supinator.
- Pronation muscles: round pronatorand square pronator .
Exercises
Elbow curls
Elbow flexion is a physical exercise performed in an inclined position, lying down, raising and lowering the body with the arms . It is dedicated to the development of the pectoral muscles and triceps , with additional benefits for the deltoids, the anterior serratil and the coracobrachial. A variation of the exercise that reduces your difficulty is to perform it against a wall instead of the floor. Another change is supported with the knees instead of the toes of the feet .
