Cubital Fossa (Viva-related)

CUBITAL FOSSA


 Q.1 What is cubital fossa?

  • It is a triangular hollow in front of the elbow.

Q.2 What are the boundaries of cubital fossa?

  • Laterally: Medial border of brachioradialis.
  • Medially: Lateral border of pronator teres.
  • Base: By an imaginary line joining two epicondyles of the humerus.
  • Apex: By meeting point of lateral and medial boundaries.
  • Floor: By – Brachialis and – Supinator.
  • Roof: – Skin – Superficial fascia– Deep fascia and – Bicipital aponeurosis

Q.3 What are the contents of cubital fossa?

  • Median nerve.
  • Termination of the brachial artery.
  • The tendon of biceps with bicipital aponeurosis.
  • Radial nerve.

Q.4 Name the structures lying in the superficial fascia of the cubital fossa.

  • Median cubital vein
  • Lateral cutaneous nerve of forearm
  • Medial cutaneous nerve of the forearm.

Q.5 What is the clinical importance of the median cubital vein?

  • It is the vein of choice for intravenous injections because it is fixed by perforator, so it does not slip away from the needle.

Q.6 What is the carrying angle?

  • It is the angle between the long axis of the arm with the long axis of the forearm, when the forearm is extended and supinated. It disappears in full flexion of the elbow and in pronation. It is about 170°.

Q.7 What are the factors responsible for carrying angle?

  • The medial flange of the trochlea is larger than the lateral flange and projects downward to a lower level. As a result lower edge of trochlea passes downwards and medially.
  • The superior articular surface of the coronoid process of the ulna is oblique.

Q.8 What is the importance and sex differences in the carrying angle?
Importance:

  • It allows the arm to swing clearly away from the body.
  • The forearm comes in line with the long axis of the arm in mid prone position in which the hand is mostly used.

Sex differences:

  • Greater in females because of wider pelvis.