Muscle biceps brachial

The muscle biceps brachial is a Muscle arm. It is divided into two chiefs, the long biceps and the short biceps .

Origin

  • the short biceps fits on the top of the process coracoïde of the Scapula (scapula).
  • the long biceps has its tendon of insertion on the process supra-glénoïdien of the Scapula.

Way

  • the short biceps is slightly oblique outwards.
  • the long biceps sees its tendon perforating the capsule of the articulation scapulo-humérale, to pass inside this capsule, then to pass in a synovial sheath in the furrow intertuberculaire E (gutter bicipitale) of the Os humérus.
  • These two chiefs of join roughly with semi-arm.

Termination

  • distal insertion is carried out by a tendon common to the two chiefs which will fit on the posterior face of the tuberosity bicipitale of the Radius.
  • It also ends in aponevrotic expansions on the fascia antébrachial.

Action

  • Contrairement to the popular beliefs, the “biceps”, as it is often called (there is also a Muscle femoral biceps), is not that flexor (this function being ensured by the Muscle brachial), but it is mainly supinator, especially when the Coude is bent, and this thanks to its insertion on the posterior face of the tuberosity bicipitale.
  • It is nevertheless slightly Fléchisseur Coude.

Innervation

  • It is innervé by the Nerf musculocutané (branches of the pair of rachidian roots cervical C5-C6 of the Plexus brachial).

See too

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