Cubital Fossa

cubital fossa
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The cubital fossa is a triangular molded area or arranged in connection to the ventral surface of the lower arm. It has an unequaled, average and parallel fringe, and in addition, a summit which is coordinated poorly. The cubital fossa additionally has a section and top, and it is navigated by structures which make up its substance.


cubital fossa


The cubital fossa contains four structures, which from average to parallel are:

  • Middle nerve
  • Brachial supply route
  • Ligament of biceps brachii (biceps brachii is a muscle of the front compartment of the arm)
  • Spiral nerve


Inside the cubital fossa, the brachial supply route bifurcates to frame two more corridors. These supply routes are the spiral vein (along with the side) and the ulnar corridor (medially). These two courses are named and arranged as per the outspread and ulnar bones of the lower arm.

The belt framing the rooftop likewise contains the middle cubital vein, the sidelong cutaneous nerve of the lower arm, and average cutaneous nerve of the lower arm. On the bicipital aponeurosis lies the basilic vein (medially) and the cephalic vein (along with the side).

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The Boundaries of the cubital fossa

Unrivaled Border

The unrivaled outskirt – otherwise called the base – of the cubital fossa, is shaped by a nonexistent line that keeps running from the average epicondyle of the humerus (bone of arm) to the horizontal epicondyle of the humerus.


Average Border

This fringe of the triangle is framed by the pronator teres muscle.


Horizontal Border

The triangle is shaped at this limit by the brachioradialis muscle.



The peak is coordinated poorly, and it is framed by the pronator teres and brachioradialis muscles, at the point where these two muscles meet and traverse each other.



This is shaped, from shallow to profound, by the skin, the belt of the lower arm and the bicipital aponeurosis (medially). The bicipital aponeurosis frames a fractional defensive covering to the average nerve, brachial corridor, spiral vein, and ulnar course.

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Structures making up the base incorporate the brachialis muscle (proximally) and the supinator muscle (distally).

The cubital fossa is triangular fit as a fiddle, and has three fringes:

Horizontal fringe is shaped by the average outskirt of the brachioradialis muscle.

Average fringe is shaped by the horizontal outskirt of the pronator teres muscle.

Prevalent outskirt is by a fanciful line between the epicondyles of the humerus.


Cubital Fossa Limitations

The floor is framed proximally by the brachialis, and distally by the supinator muscle.

The rooftop comprises of skin and belt and is strengthened by the bicipital aponeurosis. Middle cubital vein keeps running inside the rooftop and can be gotten to for venipuncture. The sidelong cutaneous nerve of the lower arm and the average cutaneous nerve of the lower arm likewise are available in the rooftop. Apex is coordinated poorly and is shaped by the gathering purpose of the parallel and average fringes.

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The cubital fossa contains four principle vertical structures from horizontal to average.

  • The outspread nerve isn’t in every case entirely thought about a piece of the cubital fossa, however, is in the region, going underneath the brachioradialis muscle. As is does as such, the spiral nerve separates into its profound and shallow branches.
  • Biceps ligament Iruns through the cubital fossa, joining to the outspread tuberosity, only distal to the neck of the span.
  • Brachial vein supplies oxygenated blood the lower arm. It bifurcates into the outspread and ulnar corridors at the zenith of the cubital fossa.
  • Middle nerve leaves the cubital between the two leaders of the pronator teres. It supplies most of the flexor muscles in the lower arm.

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