Upper arm musculature
On the upper arm, the muscles are divided into two groups: the upper arm fascia (fascia brachii) and the lateral and middle intermuscular septum. Flexor muscles: The flexors of the upper arm are All flexors are innervated by the nervus musculocutaneus The biceps brachii muscle consists of two large muscle heads and thus has two different origins. In the course of time, the two muscle heads unite and attach together to the tuberosity radii of the humerus.
The biceps brachii muscle is a double-jointed muscle and therefore has many functions. The tendon of the caput longum extends over the head of humerus and through the shoulder joint capsule. It also crosses the elbow joint gap.
In the shoulder joint it leads to the The main function of the muscle, however, is the movement in the elbow joint. Here, the muscle leads to flexion and rotation of the forearm. This allows the palm of the hand to move upwards.
The Musculus brachialis originates at the front of the humerus and attaches to the elbow joint capsule. It thus bends the forearm, regardless of the hand position.In comparison to the aforementioned Musculus biceps brachii, it is the much stronger flexor and is therefore very important especially when lifting heavy loads. The coracobrachialis muscle originates from a bony projection of the shoulder blade (Processus coracoideus) and attaches to the middle surface of the humerus.
Its main task is to provide the extensor muscles: The extensor muscles of the upper arm are located on the back surface of the upper arm. The triceps brachii muscle has three muscle heads which originate at different points. All three parts start together at the olecranon of the ulna.
Often there are some bursa sacs embedded as slide bearings. The main function of this muscle is the extension of the elbow joint. The very small Musculus anconeus originates from the lateral epicondylus of the upper arm and also attaches to the olecranon.
Like the triceps brachii muscle, it serves to extend the elbow joint. Both muscles are innervated by the radial nerve.
- Rear extensor group (extensors, dorsal)
- Front flexor group (flexors, ventral)
- The biceps brachii muscle
- The brachial musculus
- The Musculus coracobrachialis
- The caput longum (long part) originates from the tubercle supraglenoidal of the shoulder blade (scapula),
- The caput breve (short part) of the processus coracoideus of the shoulder blade.
- Interior Rotation
- Anteversion (forward stretching of the arm)
- Long part of the muscle for adduction
- Short part for abduction in the shoulder joint
- Interior Rotation
- Adduction (approaching the body)
- Anteversion (forward stretching) of the upper arm in the shoulder joint
- Musculus triceps brachii
- Musculus anconeus.
- The long part (Caput longum) has its origin at the tuberculum infraglenoidale of the shoulder.
- The lateral part (caput laterale) originates from the lateral and rear surface of the humerus.
- The middle muscle head (Caput mediale) originates at the middle and rear surface.
