The muscular axillary arch: An anatomic study and clinical considerations

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Abstract

OBJECTIVE: The muscular axillary arch is a musculotendinous structure that arises from the latissimus dorsi muscle and crosses the axilla before inserting to the humerus, brachial fascia, or coracoid process. Case reports have described the neurovascular compression symptoms caused by this anatomic variant and have reported that the symptoms can be relieved by division of the muscle. However, there has been little information published regarding this topic in the neurosurgical literature. METHODS: We evaluated 70 axillary dissections in 35 cadavers to assess for the presence of this anomaly. RESULTS: The muscular axillary arch was identified unilaterally in 3 (8.6%) of the 35 cadavers. All 3 arches arose from the anterior border of the latissimus dorsi muscle and inserted at a point along a line extending from the coracoid process to the intertubercular groove deep to the insertion of the pectoralis major muscle. All 3 arches crossed over the neurovascular bundle in the axilla. CONCLUSION: Compression by the muscular axillary arch should be considered in the differential diagnosis of patients with thoracic outlet and hyperabduction syndromes.

Original languageEnglish (US)
JournalNeurosurgery
Volume63
Issue number4 SUPPL.
DOIs
StatePublished - Oct 1 2008

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Axilla
Superficial Back Muscles
Cadaver
Muscles
Thoracic Outlet Syndrome
Pectoralis Muscles
Fascia
Humerus
Dissection
Arm
Differential Diagnosis
Clinical Studies
Coracoid Process

All Science Journal Classification (ASJC) codes

  • Surgery
  • Clinical Neurology

Cite this

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title = "The muscular axillary arch: An anatomic study and clinical considerations",
abstract = "OBJECTIVE: The muscular axillary arch is a musculotendinous structure that arises from the latissimus dorsi muscle and crosses the axilla before inserting to the humerus, brachial fascia, or coracoid process. Case reports have described the neurovascular compression symptoms caused by this anatomic variant and have reported that the symptoms can be relieved by division of the muscle. However, there has been little information published regarding this topic in the neurosurgical literature. METHODS: We evaluated 70 axillary dissections in 35 cadavers to assess for the presence of this anomaly. RESULTS: The muscular axillary arch was identified unilaterally in 3 (8.6{\%}) of the 35 cadavers. All 3 arches arose from the anterior border of the latissimus dorsi muscle and inserted at a point along a line extending from the coracoid process to the intertubercular groove deep to the insertion of the pectoralis major muscle. All 3 arches crossed over the neurovascular bundle in the axilla. CONCLUSION: Compression by the muscular axillary arch should be considered in the differential diagnosis of patients with thoracic outlet and hyperabduction syndromes.",
author = "Elias Rizk and Kimberly Harbaugh",
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The muscular axillary arch : An anatomic study and clinical considerations. / Rizk, Elias; Harbaugh, Kimberly.

In: Neurosurgery, Vol. 63, No. 4 SUPPL., 01.10.2008.

Research output: Contribution to journalArticle

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N2 - OBJECTIVE: The muscular axillary arch is a musculotendinous structure that arises from the latissimus dorsi muscle and crosses the axilla before inserting to the humerus, brachial fascia, or coracoid process. Case reports have described the neurovascular compression symptoms caused by this anatomic variant and have reported that the symptoms can be relieved by division of the muscle. However, there has been little information published regarding this topic in the neurosurgical literature. METHODS: We evaluated 70 axillary dissections in 35 cadavers to assess for the presence of this anomaly. RESULTS: The muscular axillary arch was identified unilaterally in 3 (8.6%) of the 35 cadavers. All 3 arches arose from the anterior border of the latissimus dorsi muscle and inserted at a point along a line extending from the coracoid process to the intertubercular groove deep to the insertion of the pectoralis major muscle. All 3 arches crossed over the neurovascular bundle in the axilla. CONCLUSION: Compression by the muscular axillary arch should be considered in the differential diagnosis of patients with thoracic outlet and hyperabduction syndromes.

AB - OBJECTIVE: The muscular axillary arch is a musculotendinous structure that arises from the latissimus dorsi muscle and crosses the axilla before inserting to the humerus, brachial fascia, or coracoid process. Case reports have described the neurovascular compression symptoms caused by this anatomic variant and have reported that the symptoms can be relieved by division of the muscle. However, there has been little information published regarding this topic in the neurosurgical literature. METHODS: We evaluated 70 axillary dissections in 35 cadavers to assess for the presence of this anomaly. RESULTS: The muscular axillary arch was identified unilaterally in 3 (8.6%) of the 35 cadavers. All 3 arches arose from the anterior border of the latissimus dorsi muscle and inserted at a point along a line extending from the coracoid process to the intertubercular groove deep to the insertion of the pectoralis major muscle. All 3 arches crossed over the neurovascular bundle in the axilla. CONCLUSION: Compression by the muscular axillary arch should be considered in the differential diagnosis of patients with thoracic outlet and hyperabduction syndromes.

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