Subscapularis Muscle

Authors

Affiliations

Nathaniel Yomogida, B.S., SPT

Doctor of Physical Therapy

B.S. in Kinesiology

Chloë Kerstein, B.S., SPT

Doctor of Physical Therapy

B.A. in Neuroscience

Schematic of Rotator Cuff Muscles (anterior view)¹
1: Supraspinatus
2: Infraspinatus
3: Teres Minor

Schematic of Rotator Cuff Muscles (posterior view)¹
4: Subscapularis

Muscle	Origin	Insertion	Innervation	Action
Subscapularis	Subscapular fossa	Lesser tubercle of Humerus	Upper Subscapular n. Lower Subscapular n. C5 - C6	GHJ: IR, Stabilization

Origin

Subscapular fossa of scapula¹

Insertion

Lesser tubercle of Humerus¹

Innervation

• Upper Subscapular N.¹
• Lower Subscapular N.¹
• (C5, C6)¹

Action

GHJ: Internal Rotation, Adduction¹

Test

• Lift-off Test (Gerber’s test)

• Bear hug test
• Belly press test (Napolean Test)
  • “performed by having the patient place the affected hand on the abdomen and attempt to move the elbow anteriorly. The test was considered positive if the patient could not move the elbow forward”^{gillPhysicalExaminationPartial2007?}

References

1.

Gilroy AM, MacPherson BR, Wikenheiser JC, Voll MM, Wesker K, Schünke M, eds. Atlas of Anatomy. 4th ed. Thieme; 2020.