Martin-Gruber anastomosis

Mar·tin-Gru·ber a·nas·to·mo·sis

(mahr'tin grū'ber),
a nerve anomaly in the forearm in which motor axons that will ultimately innervate various intrinsic hand muscles supplied by the ulnar nerve, cross from the median nerve (typically its anterior interosseous branch) to the main trunk of the ulnar nerve; also referred to as a median-to-ulnar crossover.


George B., German physician, 1884-1977.
Martin-Gruber anastomosis - see under Martin, August E
Meckel-Gruber syndrome - see under Meckel, Johann Friedrich, the younger


August E., German gynecologist, 1847-1933.
Martin tube - a drainage tube with a cross piece near the extremity to keep it from slipping out of a cavity.
Martin-Gruber anastomosis - a nerve anomaly in the forearm, consisting of a median-to-ulnar nerve communication.
Martin-Albright syndrome - hereditary defects. Synonym(s): Albright IV syndrome
References in periodicals archive ?
One of the most important anastomoses of nerves in the upper extremity is Martin-Gruber anastomosis (MGA).
Electrophysiological evaluation of the incidence of Martin-Gruber anastomosis in healthy subjects.
An anatomic study on the Martin-Gruber anastomosis.
Normal median nerve proximal latency in carpel tunnel syndrome: a clue to coexisting Martin-Gruber anastomosis.
Unusual ulnar sensory innervation and Martin-Gruber anastomosis in a patient with a carpal tunnel syndrome.
Prevalence of Martin-Gruber anastomosis on motor nerve conduction studies].
Martin-Gruber Anastomosis (MGA) is a well known neuronal anomalous connection occurring at various levels between median and ulnar nerves in the forearm.
Martin-Gruber anastomosis is a usual finding with incidence ranging from 5% to 34%4.
In fact, this so called conduction block between below- and above-elbow ulnar nerve stimulation sites was explained by a possible Martin-Gruber anastomosis (MGA).
Martin-Gruber anastomosis should be kept in mind in all patients undergoing electrophysiological studies of upper limbs as it can give rise to faulty interpretation especially in case of suspected compression neuropathies of median and ulnar nerves across wrist and elbow.
Proximal martin-gruber anastomosis mimicking ulnar neuropathy at the elbow.