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Muscular Branch of Axillary Nerve to Teres Minor Muscle (Left)
Nervous System

Muscular Branch of Axillary Nerve to Teres Minor Muscle (Left)

Ramus musculi teretis minoris nervi axillaris

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Quick Facts

Origin: Axillary nerve (C5,C6).

Course: Short course, running posteromedially.

Branches: None.

Supply: Motor innervation to teres minor muscle.

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Origin

The muscular branch to the teres minor muscle arises from the posterior branch of axillary nerve. It contains motor neurons which come from the C5 and C6 cervical spinal roots.

Course

The axillary nerve, which originates from the posterior cord of brachial plexus, curves back inferior to the glenohumeral articular capsule, and traverses through the quadrangular space bounded above by subscapularis and teres minor muscles. Here the axillary nerve divides into anterior and posterior branches, which provide motor innervation to deltoid and teres minor muscles (Zhao et al., 2001; Loukas et al., 2009).

The posterior branch runs medially and posteriorly along the attachment of the lateral head of triceps, inferior to the glenoid rim for approximately 1 cm. The nerve to teres minor courses medially along the posterior aspect of the inferior part of the glenoid rim, having an intimate association with the glenoid and shoulder joint capsule for approximately 2 cm, before entering the muscle at its inferior border.

The anterior branch of the axillary nerve winds around the neck of the humerus to innervate the deltoid muscle.

Branches

There are no named branches.

Supplied Structures

The muscular branch of axillary nerve to teres minor provides motor innervation to teres minor muscle.

References

Loukas, M., Grabska, J., Tubbs, R. S., Apaydin, N. and Jordan, R. (2009) 'Mapping the axillary nerve within the deltoid muscle', Surg Radiol Anat, 31(1), pp. 43-7.Zhao, X., Hung, L. K., Zhang, G. M. and Lao, J. (2001) 'Applied anatomy of the axillary nerve for selective neurotization of the deltoid muscle', Clin Orthop Relat Res, (390), pp. 244-51.

Learn more about this topic from other Elsevier products

Axillary Nerve

ScienceDirect image

The axillary nerve and the posterior circumflex humeral artery pass through the quadrilateral or quadrangular space, which lies inferoposterior to the GH joint, bounded by the teres minor superiorly, the teres major inferiorly, the long head of triceps medially, and the shaft of the humerus laterally.

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