scholarly journals Isolated Musculocutaneous Nerve Injury in a Professional Baseball Player: A Case Report

2021 ◽  
Vol 11 (3) ◽  
Author(s):  
Takeshi Kataoka ◽  
Takeshi Kokubu ◽  
Yutaka Mifune ◽  
Atsuyuki Inui ◽  
Tetsuya Yamazaki ◽  
...  
Keyword(s):  
Nerve Injury ◽  
Biceps Brachii ◽  
Compound Muscle Action Potential ◽  
Musculocutaneous Nerve ◽  
Professional Baseball ◽  
Motor Unit Potential ◽  
Nerve Lesion ◽  
Biceps Brachii Muscle ◽  
Baseball Pitcher ◽  
The Right

Introduction: Musculocutaneous nerve lesion in a throwing athlete is a rare condition. We report the case of a professional baseball pitcher with an isolated musculocutaneous nerve lesion that occurred during a pitching motion. Case Presentation: The patient had radiating pain in the upper arm and weakness of elbow flexion. Physical examination revealed flaccid paralysis of the biceps brachii muscle and paresthesia in the right lateral forearm. Musculocutaneous nerve injury was suspected. Because some signs of recovery were observed within a few days, the patient received non-operative management. Nerve conduction studies at 2 weeks after the injury showed low-amplitude compound muscle action potential of the right biceps brachii muscle by stimulation of the musculocutaneous nerve. Needle electromyography showed markedly reduced motor unit potential recruitment in the biceps brachii muscle. He was diagnosed as having isolated musculocutaneous nerve injury. At 2 months after the injury, the muscle contraction and strength of the biceps brachii muscle improved. At 7 months after the injury, muscle weakness was fully recovered. His pitching ability returned to that of a competitive player. Conclusion: Because the neuroparalysis was incomplete and began to recover within a few days, we considered the pathology of this injury to be incomplete axonotmesis, which was successfully treated conservatively. Keywords: Isolated musculocutaneous nerve injury, baseball pitcher, axonotmesis.

scholarly journals Absence of musculocutaneous nerve and accessory head of biceps brachii: a case report

2005 ◽  
Vol 38 (02) ◽  
pp. 114-146
Author(s):  
L Arora ◽  
R Dhingra
Keyword(s):  
Case Report ◽  
Median Nerve ◽  
Upper Limb ◽  
Biceps Brachii ◽  
Musculocutaneous Nerve ◽  
Nerve Supply ◽  
Biceps Brachii Muscle ◽  
Nerve Roots ◽  
Lateral Cutaneous Nerve ◽  
The Right

ABSTRACTDuring dissection of a 55-year-old female cadaver, we observed that three nerve roots contributed to the formation of Median nerve in her right upper limb. Along with this variation, absence of Musculocutaneous nerve was noticed. The muscles of front of arm i.e. Biceps Brachii, Brachialis and Coracobrachialis received their nerve supply from Median nerve. The Lateral cutaneous nerve of forearm was derived from Median nerve. Also an accessory head of Biceps Brachii muscle was present in the right arm of the same cadaver. It is extremely important to be aware of these variations while planning a surgery in the region of axilla or arm as these nerves are more liable to be injured during operations.

scholarly journals Indirect traumatic musculocutaneous nerve injury confused with static line injury: A case report

2021 ◽  
Vol 26 (3) ◽  
pp. 613-616
Author(s):  
Eun Jin Kim ◽  
Kyoung-Eun Kim
Keyword(s):  
Case Report ◽  
Nerve Injury ◽  
Biceps Brachii ◽  
Musculoskeletal Injury ◽  
Musculocutaneous Nerve ◽  
Secondary Injury ◽  
Biceps Brachii Muscle ◽  
Upper Arm ◽  
Biceps Brachii Tendon ◽  
Indirect Injury

The musculocutaneous nerve is rarely injured because it is short and is located deep in the shoulder and arm. Damage is usually caused by direct injuries, including stabbing, explosion, and surgery in a war setting. Although indirect injury of the musculocutaneous nerve is extremely rare, it occurs in various situations. In military parachuting-related activities, musculoskeletal injury occurs most commonly, and static line injury is known as rupture of the biceps brachii tendon. However, musculocutaneous neuropathy can also result from secondary injury by the static line. The musculocutaneous nerve goes together with the biceps brachii muscle, and the musculocutaneous nerve could overstretch and compress within the coracobrachialis muscle where the nerve is relatively fixed due to the overloading of the upper arm with shoulder extension. This report focuses on the indirect musculocutaneous nerve injury with axonotmesis following an overloading event by the static line during military parachuting. In this case, some physicians may confuse nerve injury with static line injury, leading to delays in the diagnosis of neuropathy. If the biceps brachii muscle is damaged due to trauma, checking for the accompanying musculocutaneous nerve injury is necessary.

scholarly journals RESIDENTS CASE REPORT: MUSCULOCUTANEOUS NERVE INJURY IN A COLLEGIATE BASEBALL PITCHER

2020 ◽  
Vol 15 (5) ◽  
pp. 804-813
Author(s):  
Ashlyne P. Vineyard ◽  
Andrew R. Gallucci ◽  
Samuel R. Imbus ◽  
James C. Garrison ◽  
John E. Conway
Keyword(s):  
Case Report ◽  
Nerve Injury ◽  
Musculocutaneous Nerve ◽  
Baseball Pitcher ◽  
Collegiate Baseball

scholarly journals Additional head of biceps brachii: a cadaveric study

2020 ◽  
Vol 8 (4) ◽  
pp. 1237
Author(s):  
Seema Gupta ◽  
Anshu Soni ◽  
Hitant Vohra
Keyword(s):  
Indian Population ◽  
Biceps Brachii ◽  
Nerve Supply ◽  
Biceps Brachii Muscle ◽  
Upper Limbs ◽  
Anterior Compartment ◽  
The Third ◽  
The Common ◽  
The Right ◽  
Radial Tuberosity

Background: The biceps brachii is an important muscle of anterior compartment of arm. It shows frequent anatomic variability due to presence of supernumerary heads. Knowledge of the existence of the third head of biceps brachii is important for surgeons. Keeping this in mind a study was planned to see the incidence of additional head of biceps brachii in sample Indian population and to compare it with other racial groups.Methods: The study was carried out on 30 cadaveric upper limbs. The upper limbs were dissected and studied for the presence of additional head of biceps brachii. The attachment and nerve supply of the additional head was carefully observed, recorded and documented.Results: Out of 30 limbs which were dissected, additional head of biceps brachii was found only in two limbs. In both the cases the additional head was present only on the right side and arose from the anterior surface of humerus, superomedial to the origin of brachialis. The additional head fused with the common bulk of the muscle and was inserted into the radial tuberosity and bicipital aponeurosis. The extra heads of biceps brachii muscle received branches from musculocutaneous nerve.Conclusions: Biceps brachii is one of the commonest muscles showing variations. The additional head is not only of academic importance, but its knowledge also helps clinicians in managing fractures of humerus and nerve entrapment.

scholarly journals Corticospinal Excitability to the Biceps Brachii is Not Different When Arm Cycling at a Self-Selected or Fixed Cadence

2019 ◽  
Vol 9 (2) ◽  
pp. 41 ◽  
Author(s):  
Evan Lockyer ◽  
Anna Nippard ◽  
Kaitlyn Kean ◽  
Nicole Hollohan ◽  
Duane Button ◽  
...  
Keyword(s):  
Transcranial Magnetic Stimulation ◽  
Magnetic Stimulation ◽  
Biceps Brachii ◽  
Motor Evoked Potentials ◽  
Compound Muscle Action Potential ◽  
Corticospinal Excitability ◽  
Biceps Brachii Muscle ◽  
Muscle Action ◽  
Arm Cycling ◽  
Muscle Action Potential

Background: The present study compared corticospinal excitability to the biceps brachii muscle during arm cycling at a self-selected and a fixed cadence (SSC and FC, respectively). We hypothesized that corticospinal excitability would not be different between the two conditions. Methods: The SSC was initially performed and the cycling cadence was recorded every 5 s for one minute. The average cadence of the SSC cycling trial was then used as a target for the FC of cycling that the participants were instructed to maintain. The motor evoked potentials (MEPs) elicited via transcranial magnetic stimulation (TMS) of the motor cortex were recorded from the biceps brachii during each trial of SSC and FC arm cycling. Results: Corticospinal excitability, as assessed via normalized MEP amplitudes (MEPs were made relative to a maximal compound muscle action potential), was not different between groups. Conclusions: Focusing on maintaining a fixed cadence during arm cycling does not influence corticospinal excitability, as assessed via TMS-evoked MEPs.

scholarly journals Third Head of the Biceps Brachii Muscle and a Communication between the Musculocutaneous and Median Nerves: A Case Report

2019 ◽  
Vol 36 (01) ◽  
pp. 051-054
Author(s):  
Caroline Dussin ◽  
Lucas Moyses ◽  
Sávio Siqueira
Keyword(s):  
Case Report ◽  
Biceps Brachii ◽  
Anatomical Variations ◽  
Clinical Implications ◽  
Biceps Brachii Muscle ◽  
Present Case Report ◽  
Communicating Branch ◽  
Brachialis Muscle ◽  
Male Cadaver ◽  
The Right

AbstractMany authors have reported and classified several anatomical variations between the musculocutaneous (Mc) and median (Me) nerves, regarding their origin, number, and proximity with the coracobrachialis muscle. There also are, in the scientific community, records classifying the origin of supernumerary heads of the biceps brachii muscle. However, the occurrence of both aforementioned variations in the same arm is very uncommon. During a routine dissection of the right upper limb of a male cadaver, a third head of the biceps brachii was found originating from the fibers of the brachialis muscle, as well as a communicating branch between the Mc and the Me nerves, in the same limb. The objective of the present case report is to describe these multiple variations found, relating them and discussing their relevant clinical implications.

scholarly journals Absence of the musculocutaneous nerve: a rare anatomical variation with possible clinical-surgical implications

2008 ◽  
Vol 126 (5) ◽  
pp. 288-290 ◽  
Author(s):  
José Humberto Tavares Guerreiro Fregnani ◽  
Maria Inez Marcondes Macéa ◽  
Celina Siqueira Barbosa Pereira ◽  
Mirna Duarte Barros ◽  
José Rafael Macéa
Keyword(s):  
Median Nerve ◽  
Lateral Surface ◽  
Biceps Brachii ◽  
Anatomical Variation ◽  
Musculocutaneous Nerve ◽  
The Third ◽  
Brachialis Muscle ◽  
Male Cadaver ◽  
The Right ◽  
Unknown Case

CONTEXT: The musculocutaneous nerve is one of the terminal branches of the lateral fasciculus of the brachial plexus, and is responsible for innervation of the flexor musculature of the elbow and for skin sensitivity on the lateral surface of the forearm. Its absence has been described previously, but its real prevalence is unknown. CASE REPORT: A case of absence of the musculocutaneous nerve that was observed during the dissection of the right arm of a male cadaver is described. The area of innervation was supplied by the median nerve. From this, three branches emerged: one to the coracobrachialis muscle, another to the biceps brachii muscle and the third to the brachialis muscle. This last branch continued as a lateral antebrachial cutaneous nerve. This is an anatomical variation that has clinical-surgical implications, considering that injury to the median nerve in this case would have caused unexpected paralysis of the flexor musculature of the elbow and hypoesthesia of the lateral surface of the forearm.

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