Rankos raumenys

Sinonimai plačiąja prasme

Arm muscles, arm muscle training, upper arm muscles

Funkcija

The arm muscles, or elbow joint muscles, which are mainly located on viršutinė ranka, act on alkūnės sąnarį. While three muscles are responsible for flexion, the triceps alone acts as the three-headed extensor of viršutinė ranka. As this muscle has three heads, it acts as a multijoint muscle and additionally causes papildymas ir retroversija viduje peties sąnarys.

Viršutinės rankos raumenys

Viršutinė ranka muscles are divided into two groups, the flexors and the extensors. The flexors include the biceps brachii and brachialis muscles and the extensors include the triceps brachii and the anconeus muscles. The musculus biceps brachii has two parts.

The caput longum (long “vadovas“) originates from a small protrusion (tuberculum supraglenoidale) at the upper end of the žastikaulis (caput humeri). The caput breve (short “vadovas“) has its origin at the projection of the mentė (Processus coracoideus). Both arms start at a small projection (Tuberositas radii) on the radius (dilbis kaulas).

The tendon of the biceps also pulls into the aponeurosis bicipitalis, a part of the fascia of the dilbis. The biceps is responsible for bending (flexion) and outward rotation of the hand by turning the dilbis (supinacija). It also causes the arm to be abducted from the body (pagrobimas) and the arm to move forward (antversija).

The biceps has a greater distance to the flexion/extension axis than the brachial muscle and therefore has a greater torque during flexion. When the elbow is bent at right angles, the biceps is also the strongest supinator. The musculus brachialis lies below the biceps and is therefore closer to the flexion/extension axis than the biceps.

Therefore even small changes in the length of the brachialis lead to large bending movements in the elbow. It is therefore the stronger flexor. In addition, a few fibres of the brachialis pull into the sąnario kapsulė of the elbow and tension it, therefore it is also called capsule tensioner.

The Musculus brachialis has its origin at the anterior lower third of the žastikaulis (Corpus humeri) and pulls to a rough muscle attachment point (Tuberositas ulnae) at the upper end of the ulna. The triceps has three “heads”, the caput longum (long), lateral (lateral) and medial (towards the middle of the body). The caput longum begins at the outer edge of the mentė (tuberculum infraglenoidale).

The lateral caput has its origin at the lateral upper third of the žastikaulis (proximal sulcus nervus radialis). The medial caput originates from the lower third of the humerus (distal sulcus nervus radialis). All three parts move towards the elbow.

The triceps is responsible for the extension of the arm and also causes the arm to move sideways towards the body (papildymas). The musculus anconeus starts at the lateral elbow and moves to the upper, rear end of the ulna. It also causes an extension and is also a capsule tensioner like the brachialis muscle.