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Cubital Fossa Anatomy Animation | Boundaries and Contents | USMLE Review

The cubital fossa, also known as the antecubital fossa, is a triangular depression located on the anterior aspect of the elbow. It contains important structures such as nerves, vessels, and tendons. Understanding the boundaries and contents of the cubital fossa is essential for medical students preparing for the USMLE.
Here are the boundaries and contents of the cubital fossa:

Boundaries of the Cubital Fossa:

Superior Boundary: An imaginary line connecting the medial and lateral epicondyles of the humerus.
Medial Boundary: Pronator teres muscle.
Lateral Boundary: Brachioradialis muscle.
Contents of the Cubital Fossa (from medial to lateral):

Median Nerve: The median nerve runs deep to the fascia within the cubital fossa. It gives rise to several branches that supply the muscles of the forearm and the hand.
Brachial Artery: The brachial artery is the main artery of the upper arm. It bifurcates into the radial and ulnar arteries within the cubital fossa. The brachial artery can be palpated within the fossa, commonly used for measuring blood pressure.
Biceps Brachii Tendon: The tendon of the biceps brachii muscle inserts into the radial tuberosity, which is located within the cubital fossa.
Radial Nerve: The radial nerve runs along the lateral aspect of the cubital fossa. It supplies the muscles of the posterior compartment of the forearm and provides sensory innervation to the dorsal aspect of the hand.
Median Cubital Vein: This vein connects the basilic vein medially and the cephalic vein laterally within the cubital fossa. It is commonly used for venipuncture.
Ulnar Nerve: The ulnar nerve descends along the medial aspect of the cubital fossa. It innervates the muscles of the anterior and medial compartments of the forearm and provides sensory innervation to the medial aspect of the hand.

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